木村 建次郎 | ![]() |
キムラ ケンジロウ | |
数理・データサイエンスセンター | |
教授 | |
応用理学関係 |
2020年01月 国土交通省, 令和元年度 i-Construction大賞 優秀賞, インフラ構造物の非破壊検査に向むけた世界最高性能-超広帯域レーダの実現
電磁波のパルス波形が、コンクリート固有の誘電分散性によって拡がり、レーダの高周波化が空間分解能の向上に生かされない本質的な問題に対して、誘電分散性を取り入れた波動散乱の逆問題の解析解導出に成功。 鉄道トンネル覆工検査レーダに生かされ、社会実装することに成功し、東海、東日本各地で活用され、インフラマネジメントに貢献。その他の賞
2019年11月 公益財団法人計測自動制御学会, IIFES2019 大学・高専テクニカルアカデミー研究発表奨励賞, 高感度非侵襲乳がん計測技術の開発
応用数学上の未解決問題を解決(多重経路散乱場の逆解析理論)したことにより、世界で初めてマイクロ波マンモグラフィの実現に成功。さらに、高濃度乳房に対する有効性を実証した。国内学会・会議・シンポジウム等の賞
2019年10月 神戸大学, 令和元年度学長表彰
外部資金に措置される間接経費の獲得を通じ、神戸大学の財務上の貢献が著しい研究者として、57名が被表彰者に選出され、代表者3名のうちの一人として表彰式に出席した。その他の賞
2019年05月 応用物理学会, 第46回(2019年春季)応用物理学会講演奨励賞, 超高感度磁気計測および画像再構成理論に基づく埋め込み型防犯ゲートシステムの開発
本研究では、壁や地面に埋め込み、“拳銃の所持者が検査されていることに気づかない“都市に溶け込む防犯ゲートシステム1)の開発を進めている。非磁性体であるコンクリートや木材の壁や地面に埋め込まれた2次元超高感度磁気センサアレイにて、強磁性体である拳銃が発する磁場の空間分布を検出し、木村らが開発した静磁場の画像再構成理論を用いて、拳銃近界の磁場の空間分布を再構成する。通路やビルの壁等、都市の各所に埋め込み、犯罪者がどの地点でどういった銃を所持しているか、画像判定し、そのデータを管轄のセキュリティセンターで集計し、警察と連携して犯罪を未然に防ぐシステムを実現を目指している。国内学会・会議・シンポジウム等の賞
2018年05月 応用物理学会, 第44回(2018年春季)応用物理学会講演奨励賞, マイクロ波散乱場断層イメージングシステムを用いた高濃度乳房における乳癌スクリーニング
2017年11月 国立研究開発法人 日本医療研究開発機構, 第一回日本医療研究開発大賞 日本医療研究開発機構理事長賞, 次世代乳癌スクリーニングのためのマイクロ波 散乱場断層イメージングシステムの開発
2017年10月 国立大学法人 神戸大学, 第9回 学長表彰(神戸大学)
2017年10月 神戸大学, 神戸大学理学部ホームカミングデイ第8回サイエンスフロンティア優秀発表賞, マイクロ波散乱場断層イメージングシステムの開発と乳房内3次元誘電率分布計測への応用
2017年06月 一般社団法人エレクトロニクス実装学会, 2017マイクロエレクトロニクスショー(第31回最先端実装技術・パッケージング展)アカデミックプラザ5年連続継続賞
2015年10月 公益社団法人日本化学会, 第5回CSJ化学フェスタ2015 優秀ポスター賞, 電⼦やイオンの流れを可視化する装置の開発
2014年06月 一般社団法人エレクトロニクス実装学会, 2014マイクロエレクトロニクスショー(第28回最先端実装技術・パッケージング展) アカデミックプラザ賞, “物質界面の構造を映像化するサブサーフェスイメージング法の開発”
2014年02月 第一回 京都SMI中辻賞, “高分解能サブサーフェスイメージング法の開発”
2009年09月 分子科学会, 第3回 分子科学討論会 優秀講演賞, “液中ダイナミックモード原子間力顕微鏡による局所溶媒和の構造解析”
2008年11月 公益社団法人 日本表面科学会, 第14回 日本表面科学会 技術賞, “走査型容量顕微鏡によるMOSFET動作時の不純物分布計測”
2007年06月 公益財団法人 京都技術科学センター, 関西テクノアイディアコンテスト テクノ愛’07 大学の部 京都大学VBL施設長賞, 溶媒和構造可視化装置
2006年06月 京都大学, 京都大学VBL第10回若手研究助成 優秀賞, “特殊共振構造を用いた超微弱静電気力検出センサーの開発”
2006年05月 ナノ学会, ナノ学会 第4回大会 Best Young Presenter Award, “走査型容量原子間力顕微鏡の開発とナノ電子デバイス解析への応用”
2005年11月 公益財団法人 京都技術科学センター, 関西テクノアイディアコンテスト テクノ愛’05 大学の部 準グランプリ ハイテク部門, “2次元配列された電子線照射源を用いた電子顕微鏡および符号化電子線アレイ照射方式を用いた高感度2次電子検出法”
平成16年, 日本国2005年06月 京都大学, 京都大学ナノ工学高等研究院 第3回若手研究者発表会 優秀賞, “走査型容量顕微鏡による動作中MOSFETにおける2次元キャリア密度分布計測”
平成18年, 日本国2004年11月 公益財団法人 京都技術科学センター, 関西テクノアイディアコンテスト テクノ愛’04 大学の部 優秀賞, “2次元電子ビームリソグラフィー”
平成20年, 日本国2004年09月 応用物理学会, 第16回(2004年春季)応用物理学会 講演奨励賞, “走査型容量原子間力顕微鏡(SCFM)による半導体不純物濃度評価”
平成21年, 日本国[査読有り]
研究論文(学術雑誌)
Isotactic polypropylene sheets were uniaxially stretched and observed with a frequency-modulation atomic force microscope operated in phenyloctane liquid. Crystalline lamellae were seen in fibrils with their axis parallel to the stretched direction. Individual CH3 side-chains of three-fold helices were identified in the lamellae. Fragmentation of the lamellae was induced by further stretching. The real-space features observed with the microscope were successfully compared with X-ray scattering results obtained in a synchrotron radiation facility. (C) 2015 Elsevier Ltd. All rights reserved.
ELSEVIER SCI LTD, 2016年01月15日, POLYMER, 82, 349 - 355, 英語[査読有り]
研究論文(学術雑誌)
[査読有り][招待有り]
研究論文(学術雑誌)
The structure of liquid water and 2-propanol on the (104) surface of calcite (CaCO3) was probed by frequency-modulation atomic force microscopy. The microscope tip scanned each liquid to record the tip-surface force perturbed by the liquid structure at the interface. In water, the force distribution on planes cross-sectional to the surface presents a 0.5-nm-thick checkerboard-like pattern matching the corrugated topography of the calcite surface. This provides evidence that the local water density was laterally and vertically modulated. With 2-propanol, a laterally uniform, vertically layered structure was found between the first laterally structured layer and the bulk liquid. These results are consistent with the density distributions of water and ethanol proposed in earlier X-ray and simulation studies.
AMER CHEMICAL SOC, 2013年08月, LANGMUIR, 29 (34), 10744 - 10751, 英語[査読有り]
研究論文(学術雑誌)
The structure of liquid water and 2-propanol on the (104) surface of calcite (CaCO3) was probed by frequency-modulation atomic force microscopy. The microscope tip scanned each liquid to record the tip-surface force perturbed by the liquid structure at the interface. In water, the force distribution on planes cross-sectional to the surface presents a 0.5-nm-thick checkerboard-like pattern matching the corrugated topography of the calcite surface. This provides evidence that the local water density was laterally and vertically modulated. With 2-propanol, a laterally uniform, vertically layered structure was found between the first laterally structured layer and the bulk liquid. These results are consistent with the density distributions of water and ethanol proposed in earlier X-ray and simulation studies.
AMER CHEMICAL SOC, 2013年07月24日, LANGMUIR, 29 (34), 10744 - 10751, 英語[査読有り]
研究論文(学術雑誌)
The atom-resolved topography of calcite nanoparticles was observed in water using a frequency-modulation atomic force microscope. Locally ordered structures were found and assigned to a (104) facet of crystalline calcite. (C) 2013 Elsevier B. V. All rights reserved.
ELSEVIER SCIENCE BV, 2013年06月, CHEMICAL PHYSICS, 419, 193 - 195, 英語[査読有り]
研究論文(学術雑誌)
A three-dimensional interaction force mapping experiment was carried out on a muscovite mica surface in an aqueous solution using a high-resolution and low-thermal drift frequency-modulation atomic force microscope. By collecting oscillatory frequency shift versus distance curves at the mica/solution interface, complicated hydration structures on the mica surface were visualized. Reconstructed two-dimensional frequency shift maps showed dot-like or honeycomb-like patterns at different tip-sample distances with a separation of 0.2 nm with each other, which agree well to the water molecule density maps predicted by a statistical-mechanical theory. Moreover, site-specific force versus distance curves showed a good agreement with theoretically calculated site-specific force curves by a molecular dynamics simulation. It is found that the first and second hydration layers give honeycomb-like and dot-like patterns in the two-dimensional frequency shift images, respectively, corresponding to the lateral distribution function in each layer. (C) 2013 AIP Publishing LLC.
AMER INST PHYSICS, 2013年05月09日, JOURNAL OF CHEMICAL PHYSICS, 138 (18), 184704(1-7) - 184704(1-7), 英語[査読有り]
研究論文(学術雑誌)
A three-dimensional interaction force mapping experiment was carried out on a muscovite mica surface in an aqueous solution using a high-resolution and low-thermal drift frequency-modulation atomic force microscope. By collecting oscillatory frequency shift versus distance curves at the mica/solution interface, complicated hydration structures on the mica surface were visualized. Reconstructed two-dimensional frequency shift maps showed dot-like or honeycomb-like patterns at different tip-sample distances with a separation of 0.2 nm with each other, which agree well to the water molecule density maps predicted by a statistical-mechanical theory. Moreover, site-specific force versus distance curves showed a good agreement with theoretically calculated site-specific force curves by a molecular dynamics simulation. It is found that the first and second hydration layers give honeycomb-like and dot-like patterns in the two-dimensional frequency shift images, respectively, corresponding to the lateral distribution function in each layer. (C) 2013 AIP Publishing LLC.
AMER INST PHYSICS, 2013年05月, JOURNAL OF CHEMICAL PHYSICS, 138 (18), 英語[査読有り]
研究論文(学術雑誌)
COOH- and OH-terminated thiolate monolayers were self-assembled on gold films, immersed in aliphatic alcohols, and probed using frequency-modulation atomic force microscopy. The tip-surface force was observed over the monolayers as a function of the vertical and lateral coordinates. The alcohols were structured over the monolayers to form liquid layers, as evidenced by the force strengths modulated along the vertical coordinate. The liquid layer of primary C-4 and C-8 alcohols was not homogeneous along the lateral coordinate over the COOH-terminated monolayer, perturbed by hydrogen bonding across the interface. On the other hand, tertiary C-5 and C-8 alcohols presented laterally homogeneous liquid layers. Over the OH-terminated monolayer, even primary octanol presented as laterally homogeneous layers. The laterally homogeneous or inhomogeneous distribution of the liquid alcohols was interpreted as the alcoholic OH groups being more or less able to engage the monolayers via hydrogen bonds, respectively.
AMER CHEMICAL SOC, 2013年03月, JOURNAL OF PHYSICAL CHEMISTRY C, 117 (11), 5730 - 5735, 英語[査読有り]
研究論文(学術雑誌)
The DNA double helix was first elucidated by J.D. Watson and F.H.C. Crick over a half century ago. However, no one could actually "see" the well-known structure ever. Among all real-space observation methods, only atomic force microscopy (AFM) enables us to visualize the biologically active structure of natural DNA in water. However, conventional AFM measurements often caused the structural deformation of DNA because of the strong interaction forces acting on DNA. Moreover, large contact area between the AFM probe and DNA hindered us from imaging sub-molecular-scale features smaller than helical periodicity of DNA. Here, we show the direct observation of native plasmid DNA in water using an ultra-low-noise AFM with the highly sensitive force detection method (frequency modulation AFM: FM-AFM). Our micrographs of DNA vividly exhibited not only overall structure of the B-form double helix in water but also local structures which deviate from the crystallographic structures of DNA without any damage. Moreover, the interaction force area in the FM-AFM was small enough to clearly discern individual functional groups within DNA. The technique was also applied to explore the synthesized DNA nanostructures toward the current nanobiotechnology. This work will be essential for considering the structure-function relationship of biomolecular systems in vivo and for in situ analysis of DNA-based nanodevices. © 2013 American Chemical Society.
2013年02月26日, ACS Nano, 7 (2), 1817 - 1822, 英語[査読有り]
研究論文(学術雑誌)
The DNA double helix was first elucidated by J.D. Watson and F.H.C. Crick over a half century ago. However, no one could actually "see" the well-known structure ever. Among all real-space observation methods, only atomic force microscopy (AFM) enables us to visualize the biologically active structure of natural DNA in water. However, conventional AFM measurements often caused the structural deformation of DNA because of the strong interaction forces acting on DNA. Moreover, large contact area between the AFM probe and DNA hindered us from imaging sub-molecular-scale features smaller than helical periodicity of DNA. Here, we show the direct observation of native plasmid DNA in water using an ultra-low-noise AFM with the highly sensitive force detection method (frequency modulation AFM: FM-AFM). Our micrographs of DNA vividly exhibited not only overall structure of the B-form double helix in water but also local structures which deviate from the crystallographic structures of DNA without any damage. Moreover, the interaction force area in the FM-AFM was small enough to clearly discern Individual functional groups within DNA. The technique was also applied to explore the synthesized DNA nanostructures toward the current nanobiotechnology. This work will be essential for considering the structure function relationship of biomolecular systems in vivo and for in situ analysis of DNA-based nanodevices.
AMER CHEMICAL SOC, 2013年02月, ACS NANO, 7 (2), 1817 - 1822, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
Peptide nanotubes are self-assembled fibrous materials composed of cyclic polypeptides. Recently, various aspects of peptide nanotubes have been studied, in particular the utility of different methods for making peptide nanotubes with diverse designed functions. In order to investigate the relationship between formation, function and stability, it is essential to analyze the precise structure of peptide nanotubes. Atomic-scale surface imaging in liquids was recently achieved using frequency modulation atomic force microscopy with improved force sensing. Here we provide a precise surface structural analysis of peptide nanotubes in water without crystallizing them obtained by imaging the nanotubes at the subnanometer scale in water. In addition, the local hydration structure around the peptide nanotubes was observed at the nanotube/water interface. © 2013 Elsevier B.V. All rights reserved.
Elsevier B.V., 2013年, Chemical Physics, 419, 74 - 77, 英語[査読有り]
研究論文(学術雑誌)
The interface of graphite and liquid 1-decanol was studied using frequency modulation atomic force microscopy (FM-AFM). The topography of epitaxially physisorbed decanol on the substrate was traced with submolecular resolution. The tip-surface force was monitored in the liquid as a function of the vertical and lateral tip coordinates to reveal the cross-sectional structure of the interfacial decanol. Four or more liquid layers were identified by vertically modulated force distributions. The first and second liquid layers were laterally heterogeneous, as evidenced by a force distribution that was periodically modulated along lateral coordinates. A possible structuring mechanism is proposed on the basis of energy gain by hydrogen bonding and van der Waals interactions.
AMER CHEMICAL SOC, 2012年12月, JOURNAL OF PHYSICAL CHEMISTRY C, 116 (50), 26475 - 26479, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
Self-assembled monolayers of 1-dodecanethiol were prepared on Au(1 1 1) films and immersed in liquid hydrocarbons: n-dodecane, n-hexadecane and 1-phenyloctane. Topographic protrusions of individual CH3 groups of the thiols were identified using a frequency-modulation atomic force microscope operated in the liquids. The pN-order, tip-surface force was determined as a function of the tip-surface distance and lateral coordinate to visualize structured liquids over the monolayers. Oscillatory modulations appeared on one-dimensional force-distance curves corresponding to liquid layers. On the other hand, the force distribution was homogenous along lateral coordinates, since any functional groups that produce specific interactions were absent at the interfaces. The layer-to-layer spacings were insensitive to the alkyl chain length, suggesting that the n-alkanes were oriented with their molecular axis parallel to the surface. A larger distance was observed with phenyloctane, which was ascribed to the large excluded volume of the phenyl group. (C) 2012 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2012年02月20日, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 396, 203 - 207, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
The subnanometer topography of a partially crystalline polyethylene film was observed in liquid n-dodecane using a frequency-modulation atomic force microscope. Locally ordered structures were found and assigned to a (100) facet of crystalline domains.
IOP PUBLISHING LTD, 2012年02月, JOURNAL OF PHYSICS-CONDENSED MATTER, 24 (8), 084011 (1-4) - 084011 (1-4), 英語[査読有り]
研究論文(学術雑誌)
Self-assembled monolayers of 1-dodecanethiol were prepared on Au(1 1 1) films and immersed in liquid hydrocarbons: n-dodecane, n-hexadecane and 1-phenyloctane. Topographic protrusions of individual CH3 groups of the thiols were identified using a frequency-modulation atomic force microscope operated in the liquids. The pN-order, tip-surface force was determined as a function of the tip-surface distance and lateral coordinate to visualize structured liquids over the monolayers. Oscillatory modulations appeared on one-dimensional force-distance curves corresponding to liquid layers. On the other hand, the force distribution was homogenous along lateral coordinates, since any functional groups that produce specific interactions were absent at the interfaces. The layer-to-layer spacings were insensitive to the alkyl chain length, suggesting that the n-alkanes were oriented with their molecular axis parallel to the surface. A larger distance was observed with phenyloctane, which was ascribed to the large excluded volume of the phenyl group. (C) 2012 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2012年02月, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 396, 203 - 207, 英語[査読有り]
研究論文(学術雑誌)
An anthracene derivative, having benzamide substituents bearing optically active alkyl chains, in hexane forms one-handedly biased helical supramolecular nanofibres, which show unequal linear dichroism (LD) in right- and left-handed vortex flows. © 2011 The Royal Society of Chemistry.
2011年11月14日, Chemical Communications, 47 (42), 11748 - 11750, 英語[査読有り]
研究論文(学術雑誌)
An α-Al2O3(0112) wafer was immersed in an aqueous KCl solution of 1 mol L-1 and observed with a frequency-modulation atomic force microscope. The tip-surface force was precisely determined as a function of the tip-surface distance. The force-distance relationship contained oscillations accompanied with an exponentially decayed, electric double layer force. The force oscillations were ascribed to liquid water layers confined over the Al2O3 surface. © 2010 American Chemical Society.
2010年12月16日, Journal of Physical Chemistry C, 114 (49), 21423 - 21426, 英語[査読有り]
研究論文(学術雑誌)
An alpha-Al2O3(01 (1) over bar2) wafer was immersed in an aqueous KCl solution of 1 mol L-1 and observed with a frequency-modulation atomic force microscope. The tip-surface force was precisely determined as a function of the tip-surface distance. The force-distance relationship contained oscillations accompanied with an exponentially decayed, electric double layer force. The force oscillations were ascribed to liquid water layers confined over the Al2O3 surface.
AMER CHEMICAL SOC, 2010年12月, JOURNAL OF PHYSICAL CHEMISTRY C, 114 (49), 21423 - 21426, 英語[査読有り]
研究論文(学術雑誌)
Single-crystalline TiO2(110) wafers were modified with black dye (BD) to simulate dye-sensitized, solar cell electrodes. The surface of the modified wafers was observed with a frequency-modulation atomic force microscopy in vacuum. Adsorbed BD was identified in a constant-frequency-shift topography. Mechanical energy that dissipated from the oscillating cantilever to the surface was enhanced in the presence of BD. (C) 2010 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, 2010年08月, JAPANESE JOURNAL OF APPLIED PHYSICS, 49 (8), 08LB06(1-3) - 08LB06(1-3), 英語[査読有り]
研究論文(学術雑誌)
Hydration structures at biomolecular surfaces are essential for understanding the mechanisms of the various biofunctions and stability of biomolecules. Here, we demonstrate the measurement of local hydration structures using an atomic force microscopy system equipped with a low-noise deflection sensor. We applied this method to the analysis of the muscovite mica/water interface and succeeded in visualizing a hydration structure that is site-specific on a crystal. Furthermore, at the biomolecule/buffer solution interface, we found surface hydration layers that are more packed than those at the muscovite mica/water interface. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3408289]
AMER INST PHYSICS, 2010年05月, JOURNAL OF CHEMICAL PHYSICS, 132 (19), 194705(1-5) - 194705(1-5), 英語[査読有り]
研究論文(学術雑誌)
The topography and solvation structure of a solution-TiO2 interface were observed in the dark using highly sensitive, frequency-modulated atomic force microscopy (FM-AFM). The nucleation and growth of an ionic solute, KCI, in this study, were observed in constant frequency-shift topography. The force applied to the tip was determined as a function of tip-surface distance. Modulations were identified on some force curves and were found to be related to the site-specific density of water molecules. (C) 2009 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, 2009年08月, JAPANESE JOURNAL OF APPLIED PHYSICS, 48 (8), 08JB19 - 08JB19, 英語[査読有り]
研究論文(学術雑誌)
Topographic imaging or friction force imaging of a polymer lamella in molecular resolution using atomic force microscopy (AFM) is significantly disturbed by the existence of an amorphous layer on top of the crystal. In this paper, we report the first successful molecular imaging of a polymer lamella using force modulation microscopy (FMM), which is capable of imaging crystalline molecules even if the crystal surface is covered with an amorphous layer. Molecular chains of a poly(vinylidenefluoride-trifluoroethylene)(P(VDF -TrFE)) lamella under an amorphous layer were clearly imaged using FMM at room temperature in ambient conditions. The origins and mechanisms of the image contrast in molecular resolution are also discussed.
IOP PUBLISHING LTD, 2007年08月, NANOTECHNOLOGY, 18 (30), 英語[査読有り]
研究論文(学術雑誌)
We have succeeded in the orientation control of molecular chains in high-density polyethylene thin films using an atomic force microscope as a modification tool. To modify the molecular orientation, we scanned a cantilever tip in contact with the film surface while the film temperature was kept just below its melting point. This "modification scan" aligned molecular chains parallel to the scan direction, thus well-aligned lamellar crystals were subsequently formed. Since polyethylene is the most simple linear crystalline polymer, the result strongly suggests the applicability of the technique to many other linear polymers, which promisingly expands its potential for device applications.
INST PURE APPLIED PHYSICS, 2004年11月, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 43 (11A), L1390 - L1393, 英語[査読有り]
研究論文(学術雑誌)
We successfully controlled the molecular orientation of flat-on lamellar crystals of the ferroelectric copolymer, vinylidenefluoride and trifluoroethylene (P(VDF-TrFE)), on Pt and All surfaces utilizing atomic force microscopy (AFM). The orientation was controlled by scanning a cantilever tip in contact with the film surface whose temperature was kept at just below its melting point (T-m). The molecules were stretched in the scan direction and new edge-oil crystals were subsequently formed, whose lamellar planes were perpendicular to the scan direction. We also attempted to modify an isotactic poly-1-butene (IPB) thin film and a polyaniline emeraldine base (PAN1-EB) thin film utilizing AFM. In the case of IPB film, structures similar to edge-on crystals of P(VDF-TrFE) were obtained when modified with the film temperature kept at just below its T-m. The result strongly suggests that this orientation control technique is also applicable to IPB. On the other hand, in the case of PAN1-EB film, we could obtain many ellipsoidal grains in the scanned area. One possible mechanism is that PAN1-EB molecular chains were stretched parallel to the modification scan to form fibrils or bundles.
INST PURE APPLIED PHYSICS, 2004年07月, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 43 (7B), 4575 - 4579, 英語[査読有り]
研究論文(学術雑誌)
We have developed an orientation control technique for polymer molecules utilizing contact-mode atomic force microscopy (AFM). In this technique, the molecular chains were directly modified by scanning an AFM cantilever tip in contact with the film surface at the temperature just below its melting point. We call this process "modification scan". Here, we applied this technique to poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)) thin films on graphite and glass. We prepared a 75-nm thick copolymer crystalline film on graphite whose lamellar plane was perpendicular to the substrate (edge-on), and also prepared a film of the same thickness on glass whose lamellar plane was parallel to the substrate (flat-on). After applying this technique on both films, molecular chains were stretched and aligned to the modification scan direction, and new edge-on crystals were obtained, whose lamellar planes were well-aligned perpendicular to the modification scan direction. (C) 2004 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2004年05月, EUROPEAN POLYMER JOURNAL, 40 (5), 933 - 938, 英語[査読有り]
研究論文(学術雑誌)
We have developed an aligning technique for polymer crystals and molecular chains utilizing contact-mode atomic force microscopy (AFM). We have aligned lamellar crystals and molecular chains of poly(vinylidenefluoride-trifluoroethylene) thin films. By scanning the film surface using an AFM cantilever tip at the temperature range of 70-100degreesC, we aligned the crystals to the scan direction. Moreover, we successfully aligned the molecular chains to the scan direction by scanning at a higher temperature (135degreesC). The aligned chains subsequently formed large lamellar crystals, which were still ferroelectric. (C) 2003 American Institute of Physics.
AMER INST PHYSICS, 2003年06月, APPLIED PHYSICS LETTERS, 82 (23), 4050 - 4052, 英語[査読有り]
研究論文(学術雑誌)
記事・総説・解説・論説等(学術雑誌)
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In this paper, we demonstrate various electric current imaging using electromagnetic field reconstruction method, and show its capability of reducing stray magnetic field effect.
IEEE, 2013年, 2013 IEEE 3RD CPMT SYMPOSIUM JAPAN (ICSJ 2013), 257 - 260, 英語記事・総説・解説・論説等(学術雑誌)
Hydration structures at biomolecular surfaces are essential for understanding the mechanisms of the various biofunctions and stability of biomolecules. Here, we demonstrate the measurement of local hydration structures using an atomic force microscopy system equipped with a low-noise deflection sensor. We applied this method to the analysis of the muscovite mica/water interface and succeeded in visualizing a hydration structure that is site-specific on a crystal. Furthermore, at the biomolecule/buffer solution interface, we found surface hydration layers that are more packed than those at the muscovite mica/water interface. © 2010 American Institute of Physics.
2010年05月21日, Journal of Chemical Physics, 132 (19), 194705, 英語The topography and solvation structure of a solution-TiO2 interface were observed in the dark using highly sensitive, frequency-modulated atomic force microscopy (FM-AFM). The nucleation and growth of an ionic solute, KCI, in this study, were observed in constant frequency-shift topography. The force applied to the tip was determined as a function of tip-surface distance. Modulations were identified on some force curves and were found to be related to the site-specific density of water molecules. (C) 2009 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, 2009年08月, JAPANESE JOURNAL OF APPLIED PHYSICS, 48 (8), 3pages, 英語Scanning capacitance force microscopy (SCFM) is a promising tool for investigation of two-dimensional carrier density distribution on semiconducting devices. Its sensitivity is strongly dependent on the Q factor of the mechanical resonance mode of the cantilever. Therefore, measurement in vacuum is more appropriate for increasing the sensitivity. In this letter, the authors describe noncontact-mode (NC) SCFM which is combined with the frequency modulation detection method and its signal characteristics. The authors derived a quasiquantitative calibration curve which correlates to the amplitude signal in NC-SCFM to the dopant density. Using the calibration curve, the authors obtained a quasiquantitative two-dimensional dopant density distribution map on a cross-sectional transistor device. (c) 2007 American Institute of Physics.
AMER INST PHYSICS, 2007年02月, APPLIED PHYSICS LETTERS, 90 (8), 083101 - 083101(1-3), 英語In order to increase the sensitivity of potential or capacitance measurement in Kelvin probe force microscopy or scanning capacitance force microscopy, the frequency of alternating electric field applied between the tip and the sample is tuned close to the mechanical resonance frequencies of the cantilever. The authors have designed a cantilever with a tailored resonance modes suitable for these measurements. The ratio of the first and the second resonance frequencies is optimized by the finite element method. Furthermore, they modified a commercially available cantilever according to the calculation. The performance of the modified cantilever was demonstrated in the scanning capacitance force microscopy measurement.
AMER INST PHYSICS, 2007年01月, APPLIED PHYSICS LETTERS, 90 (5), 053113 - 053113(1-3), 英語記事・総説・解説・論説等(学術雑誌)
We developed scanning probe microscopy procedures for simultaneous measurements of device characteristics and two-dimensional (2D) carrier distribution on operating cross-sectioned semiconductor devices in order to investigate their operating or failure mechanisms. Usually one cannot operate semiconductor device in a chip once the chip was cleaved and polished to expose its cross-sectioned surface because of lost electrical connections to the device. Here we employed a focused ion beam (FIB) apparatus for etching contact holes and fabricating additional electrical connections to the device by chemical vapor deposition (CVD) method. FIB-CVD is capable of fabricating three-dimensional wirings toward each electrode in a specific device. We prepared a cross-sectioned metal-oxide semiconductor field-effect-transistor sample with external tungsten wirings for device operation and performed scanning capacitance microscopy observations for dynamic 2D carrier distribution mapping on this sample. © 2006 American Vacuum Society.
2006年05月, Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, 24 (3), 1371 - 1376, 英語We have developed a frequency-modulation atomic force microscope (FM-AFM) with a wideband cantilever deflection sensor using the heterodyne optical beam deflection method. The method enhances the bandwidth of the deflection measurement up to the maximum frequency for the laser power modulation, which can be as high as gigahertz order. The phase and frequency of the cantilever vibration at 5.24 MHz are detected with a deflection noise density of 100 fm/ root Hz. FM-AFM imaging is performed on a Au(111) surface with a high-frequency cantilever. (c) 2005 American Institute of Physics.
AMER INST PHYSICS, 2005年12月, REVIEW OF SCIENTIFIC INSTRUMENTS, 76 (12), 126110, 英語We investigated two-dimensional carrier profiles in metal-oxide-semiconductor field effect transistors (MOSFETs) using scanning capacitance force microscopy (SCFM), which was based on electrostatic force detection. We successfully obtained clear contrasts on source, drain, and channel regions by contact-mode SCFM, which corresponded to their dopant concentrations. Furthermore, the contrast on the channel region was changed by applying dc offset voltage to the gate electrode. We also compared line profile obtained from the SCFM image with a dopant profile measured by secondary ion mass spectroscopy (SIMS). (c) 2005 American Vacuum Society.
A V S AMER INST PHYSICS, 2005年07月, JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 23 (4), 1454 - 1458, 英語We have developed a dynamic force microscope (DFM) with a wideband cantilever deflection sensor using heterodyne optical beam deflection (HOBD) method. The bandwidth of HOBD method is limited only by the maximum frequency for laser power modulation, which can be as high as gigahertz order. This technique allows us to use high cantilever resonance frequencies for improving the sensitivity and time response of DFM. In this letter, basic principle and experimental setup of HOBD method are described. Deflection measurement of a cantilever vibration at about 7 MHz is demonstrated. Using this cantilever, DFM imaging with a relatively fast scanning speed is performed. (C) 2004 American Institute of Physics.
AMER INST PHYSICS, 2004年12月, Applied Physics Letter, 85 (25), 6287 - 6289, 英語, 20041215 Applied Physics Letter, 85巻, 25号, pp.6287-6289.pdf, パスワードが無いWe developed scanning capacitance force microscopy (SCFM) capable of mapping local differential capacitance (00011), based on atomic force microscopy (AFM), by detecting an electrostatic force (ESF) between a tip and a sample. While an electric field alternating at an angular frequency (omega) is applied between the tip and the sample, an induced ESF oscillating at its third harmonic frequency (3omega), which contain information on partial derivativeC/partial derivativeV is detected using a lock-in amplifier (LIA). In this paper, we showed some dynamic-mode SCFM results obtained on a Si test sample. Clear dopant contrasts were obtained by dynamic-mode SCFM operated in air. An apparent position of the p-n junction was moved when an applied d.c. bias voltage was changed. A dynamic-mode SCFM image obtained in a vacuum condition utilizing frequency modulation (FM) detection method also showed clear dopant contrast. (C) 2003 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2003年03月, APPLIED SURFACE SCIENCE, 210 (1-2), 93 - 98, 英語学術書
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