写真a

UMEZU Ikurou

Position

Professor

Research Field

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials, Nanotechnology/Materials / Applied physical properties, Nanotechnology/Materials / Nanometer-scale chemistry, Nanotechnology/Materials / Nanomaterials, Energy Engineering / Fundamental plasma, Nanotechnology/Materials / Thin film/surface and interfacial physical properties, Nanotechnology/Materials / Inorganic materials and properties, Nanotechnology/Materials / Nanostructural physics, Nanotechnology/Materials / Nanobioscience

Homepage URL

http://www.phys.konan-u.ac.jp/Semicon/index.html

External Link

To the head of this page.▲

Graduating School 【 display / non-display 】

  • University of Tsukuba   Third Cluster of College   Graduated

    1979.4 - 1983.3

  • University of Tsukuba   Graduated

    　 More details

  • University of Tsukuba   Graduated

    　 More details

To the head of this page.▲

Graduate School 【 display / non-display 】

  • University of Tsukuba   Graduate School, Division of Engineering   Doctor's Course   Accomplished credits for doctoral program

    - 1988.3

  • University of Tsukuba   Graduate School, Division of Science and Engineering   Master's Course   Completed

    1983.4 - 1985.3

To the head of this page.▲

Campus Career 【 display / non-display 】

  • KONAN UNIVERSITY   Professor

    2007.4

  • KONAN UNIVERSITY   Associate Professor (as old post name)

    1999.4 - 2007.3

  •   理学部   講師

    1996.4 - 1999.3

To the head of this page.▲

External Career 【 display / non-display 】

  • 東京理科大学

    1988.4 - 1996.3

    　 More details

    Country：Japan

To the head of this page.▲

Professional Memberships 【 display / non-display 】

To the head of this page.▲
 

Research Career 【 display / non-display 】

  • pulsed laser melting

    The Other Research Programs  

    Project Year： 2008.3  -   

  • Effects of inter dot coupling in quantum dot ensemble

    (not selected)  

    Project Year： 2005.4  -   

    　More detail

    Quantum confinement effect in single quantum dot is is well known. Although, interdot coupling in quantum dot ensemble is not well known. We investigate effect of inter dot coupling through optical and transport measurements.

  • Nanocrystal/polymer composite material

    (not selected)  

    Project Year： 2000.4  -  2007.3 

    　More detail

    Novel colloidal CdS quantum dot, CdS quantum dot possessing PEG tethered chains (PEG-TC) on the surface, was prepared by Prof.Nagasaki in Tsukuba University. New type of quantum dot ensemble is possible by linking inorganic quantum dots using organic PEG-TC. A dye molecule was combined to CdS quantum dot thorough PEG-TC and energy transfer from quantum dot to dye molecule was measured by time resolved photoluminescence. We estimated energy transfer rate and found that it is relatively high due to the large spectral overlap between defect PL emission band of CdS and absorption band of dye molecule.

  • Pulsed laser deposition

    (not selected)  

    Project Year： 1995.4  -   

    　More detail

    Pulsed laser deposition in inert background gas is known as a potential technique to prepare nanocrystals. We found that surface hydrogenated silicon nanocrystal can be prepared by using hydrogen gas instead of inert gas. The surface of nanocrystal is stabilized by hydrogenation and the aggregation is reduced. The size of the primary structure is not sensitive to the background gas pressure, while the secondary structure depends on the background gas pressure. The secondary structure shows fractal structure and the fractal dimension of the secondary structure can be controlled by background gas pressure. We are interested in the correlation between fractal structure and optical and electronic properties.

  • Nanoscale silicon

    (not selected)  

    Project Year： 1995.4  -   

    　More detail

    Quantum confinement effects are thought to be most important for the properties of Si nanocrystal. Although, studies of other effects such as surface and aggregation effects are very important for deep understandind of the nature of Si nanocrystal. The surface defects formed during the natural oxidation act as photoluminescence properties. We found correlation between surface defects and PL centers. Optical absorption also depends on the surface condition. We further pointed out that surface structure affects the aggregation mechanism. The optical bandgap energy and the electronic transport depend on the aggregated secondary structure. The electric transport of this aggregated material shows hopping conduction. We found that this hopping conduction has correlation with the fractal dimension of aggregated nanocrystal. These results indicate that the control of aggregated structure is a possible technique to modify macroscopic properties of nanocrystal-film.

display all >>

To the head of this page.▲

Papers 【 display / non-display 】

  • Study on Collision Process of Opposing Unsteady Supersonic Jets and Shock Waves Reviewed

    Sakira Uno, Hiroshi Fukuoka, Atsushi Suda, Ikurou Umezu

    Open Journal of Fluid Dynamics   13 ( 2 )   104 - 112   2023.5

    　More details

    Authorship：Last author   Publisher：Scientific Research Publishing, Inc.  

    DOI： 10.4236/ojfd.2023.132008

    researchmap

  • Mixing of laser‐induced plumes colliding in a background gas Reviewed

    Keita Katayama,Toshiki Kinoshita,Ren Okada,Hiroshi Fukuoka,Takehito Yoshida,Minoru Yaga,Tamao Aoki‐Matsumoto, Ikurou Umezu

    Applied Physics A   128   2022.10

    　More details

    Authorship：Last author,　Corresponding author  

    We collided silicon and germanium laser-induced plumes in helium background gas to clarify the behavior of the plumes after the collision. The expansion of the silicon and germanium species in the mixed plume after the collision was observed separately by spectroscopic measurements and the degree of mixing was evaluated by the experimental results. When the pressure of the background gas was 2000 Pa, the plumes moved backward after the collision with the counter-propagating shock wave, and no mixing of the plumes was observed. The effect of the counter-propagating shock wave was discussed by comparing with the results of numerical calculations based on the compressible Euler equations. At 300 Pa, the plumes concentrated at about 1 mm around the central region just after the collision and almost 100% mixing occurred in this region. The concentration and mixing of the plumes in the central region is a key to forming well-mixed plume. Stagnation and partial mixing of the plumes were observed at intermediate pressures. By decreasing the background helium gas pressure from 2000 to 300 Pa, the degree of mixing increased from 0 to about 100%. The results are compared with those in argon background gas to discuss effects of mean free path. The effects of counter-propagating shock wave, mean free path and the onset time of the collision on the backward movement and mixing of the plumes are discussed.

    DOI： https://doi.org/10.1007/s00339-022-06136-1

  • リアルタイムオンライン指導により学生自身が自宅で行う実験・実習 Reviewed

    市田 正夫, 青木 珠緖, 秋宗 秀俊, 梅津 郁朗

    物理教育   69 ( 4 )   257 - 264   2021

    　More details

    Authorship：Last author  

  • 学生実験の作業化への懸念と対応 Reviewed

    梅津郁朗、青木珠緖、市田正夫、山﨑篤志、山本常夏

    物理教育   68   268 - 272   2020.12

    　More details

    Joint Work

  • Expansion of laser-induced plume after the passage of a counter shock wave through a background gas Reviewed

    Akira Higo, Keita Katayama, Hiroshi Fukuoka, Takehito Yoshida, Tamao Aoki, Minoru Yaga, Ikurou Umezu

    Applied Physics A   126 ( 4 )   2020.3

    　More details

    Joint Work

    Authorship：Last author,　Corresponding author   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s00339-020-03476-8

    researchmap

    Other Link： http://link.springer.com/article/10.1007/s00339-020-03476-8/fulltext.html

display all >>

To the head of this page.▲

Books and Other Publications 【 display / non-display 】

  • 電気特性の測定, 評価とデータ解釈

    井上 雅博　他7名（ Role： Joint author）

    技術情報協会  2015.9 

To the head of this page.▲

Review Papers (Misc) 【 display / non-display 】

  • ナノ粒子生成のためのパルスレーザー誘起プラズマの進展制御

    片山慶太, 福岡寛, 青木珠緒, 吉田岳人, 梅津郁朗

    電気学会研究会資料 電子材料研究会   EFM ( 020-025 )   5 - 7   2020.3

    　More details

    Publishing type：Research paper, summary (national, other academic conference)  

    researchmap

  • TiO2-based nanostructures for plasmonic photocatalytic applications synthesized by vapor-phase pulsed laser ablation

    T. Yoshida, T. Araki, T. Imai, I. Umezu, M. Haraguchi

    Proceedings & Abstract Book, Advanced Functional Materials Congress   66 - 66   2019.3

    　More details

  • Control of expansion processes by counter shock waves during pulsed laser ablation

    K. Katayama, T. Kinoshita, H. Fukuoka, T. Yoshida, T. Aoki, I. Umezu

    Tech. Digest of 11th International Conference on Photo-Excited Processes and Applications   68   2018.9

    　More details

  • パルスレーザーアブレーションにおける対向衝撃波のプルームダイナミクスへの影響

    片山慶太, 木下稔基, 福岡寛, 吉田岳人, 青木珠緒, 梅津郁朗

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   ROMBUNNO.19a‐A404‐8   2018.3

    　More details

  • 気相パルスレーザーアブレーション法によるAgナノ粒子構造体の作製とその構造制御

    荒木崇志, 吉田岳人, 梅津郁朗, 原口雅宣

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   ROMBUNNO.19a‐A404‐6   2018.3

    　More details

display all >>

To the head of this page.▲

Presentations 【 display / non-display 】

  • Effects of Compressible flow on Pulsed Laser Ablation under high background gas pressure

    Hiroshi Fukuoka, Minoru Yaga, Toshio Takiya, Ikurou Umezu

    11th INTERNATIONAL CONFERENCE ON LASER ABLATION  (Playa del Carmen México ) 

    　More details

    Event date： 2011.11

  • Controlling for crystal structures and morphologies of TiO2 nanoparticels de- posited by reactive pulsed laser ablation for photocatalyst applications

    Takehito Yoshida, Nobuyasu Yagi, Akira Sugimura, Ikurou Umezu

    11th INTERNATIONAL CONFERENCE ON LASER ABLATION  (Playa del Carmen México) 

    　More details

    Event date： 2011.11

  • Effect of collision between plumes during pulsed laser ablation on plume ex- pansion dynamics and on formation of hybrid nanoparticles

    Ikurou Umezu, Naomichi Sakamoto, Hiroshi Fukuoka, Yasuhiro Yokoyama, Koichiro Nobuzawa, Akira Sugimura

    　More details

    Event date： 2011.11

  • Effect of Non-equilibrium Pulsed Ejection of Si Species into Background Gas on the Formation of Si Nanocrystallite and Nanocrystal-film

    I. Umezu, S. Okubo and A. Sugimura

    MRS fall meeting 

    　More details

    Event date： 2010.11 - 2010.12

  • Synthesis of gallium nitride nanocrystallites by pulsed laser ablation in background gas of pure nitrogen

    T. Yoshida, S. Kakumoto, A. Sugimura and I. Umezu

    International Conference on Photo-excited Processes and Applications, ICPEPA7  (Denmark København) 

    　More details

    Event date： 2010.8

display all >>

To the head of this page.▲

Industrial property rights 【 display / non-display 】

  • 無機微粒子およびその製造方法

    梅津郁朗、杉村陽、南隼人、妹尾早人、田辺美晴、武居正史

    　More details

    Application no：特願２００５－２２８７６３

    Country of applicant：Domestic  

    工業所有権の名称：無機微粒子およびその製造方法
    発明者：梅津郁朗、杉村陽、南隼人、妹尾早人、田辺美晴、武居正史
    権利者：バンドー化学株式会社
    工業所有権の種類・番号：特許願・特願２００５－２２８７６３
    出願年月日、（取得年月日）：２００５．８．５

To the head of this page.▲

Works 【 display / non-display 】

  • 1p-ZL-9 水素化Siナノ結晶を活性層に持つEL素子の発光波長制御 秋季 第65回応用物理学会学術講演会

    2004

    　More details

  • Correlation between PL emission band and growth of oxide layer on surface of silicon nanocrystallites The 27th International Conference on the Physics of Semiconductors, Flagstaff, USA

    2004

    　More details

  • Correlation between electronic structure and chemical bond on the surface of hydrogenated silicon nanocrystallites The 27th International Conference on the Physics of Semiconductors, Flagstaff, USA

    2004

    　More details

  • Approaches to prepare core-shell structured Si nanocrystal by pulsed laser ablation The 5th International Symposium on Laser Precision Microfabrication -SCIENCE AND APPLICATIONS-LPM2004, Nara, Jaapn

    2004

    　More details

  • 31a-B-1 シリコン微粒子の発光特性に対する表面の影響 春季 第51回応用物理学関係連合講演会

    2004

    　More details

display all >>

To the head of this page.▲

Other Research Activities 【 display / non-display 】

  • Correlation between electronic structure and　chemical bond on the surface of hydrogenated silicon nanocrystallites

    2004.11

    　More details

    The 27th International Conference on the Physics of Semiconductors, Flagstaff, USA, 2004, July 26-30, I. Umezu, T. Makino, M. Takata, M. Inada and A. Sugimura

  • Influence of preparation conditions on hydrogen passivated Si nanoparticles formed by pulsed laser ablation in hydrogen gas,

    2004.11

    　More details

    The 5th International Symposium on Laser Precision Microfabricatioｎ　，-SCIENCE AND APPLICATIONS -, Nara, Japan, 2004, 11-14 May, M. Inada, Ikurou Umezu and A. Sugimura

  • Approaches to prepare core-shell structured Si nanocrystal by pulsed laser ablation

    2004.11

    　More details

    The 5th International Symposium on Laser Precision Microfabrication　-SCIENCE AND APPLICATIONS -LPM2004, Nara, Japan, 2004, 11-14 May, I. Umezu, T. Makino, M. Inada, K.-i. Yoshida and A. Sugimura

  • Preparation of surface controlled silicon　nanocrystallites by pulsed laser ablation

    2004.11

    　More details

    The 27th International Conference on the Physics of Semiconductors, Flagstaff, USA, 2004, July 26-30, I. Umezu, M. Inada, T. Makino and A. Sugimura

  • Correlation between PL emission band and growth　of oxide layer on surface of silicon nanocrystallites

    2004.11

    　More details

    The 27th International Conference on the Physics of Semiconductors, Flagstaff, USA, 2004, July 26-30, I. Umezu, M. Koyama, T. Hasegawa, K. Matsumoto, M. Inada and A. Sugimura

display all >>

To the head of this page.▲

Grant-in-Aid for Scientific Research 【 display / non-display 】

  • 非平衡気相レーザープロセスによる複合ナノ粒子の形成過程の解明と複合構造制御

    2021.4 - 2024.3

    JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)

    梅津郁朗

    　 More details

  • 超音速で進展する2つのプラズマの衝突過程を用いた複合ナノ粒子の創成

    2019.4 - 2023.3

    JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)

    梅津 郁朗, 吉田 岳人, 福岡 寛, 青木 珠緒

    　 More details

    本研究は2つのターゲット（SiとGe）をレーザーアブレーションし、対向して進展する2つのプルームを正面衝突させることによって複合ナノ粒子を形成しようというものである。1年目は実験結果と計算機シミュレーションを比較することによって、プルーム進展過程への対向衝撃波の影響とレーザー遅延時間の効果を明らかにしてきた。2年目は継続してプルーム衝突過程をより詳細に議論し、堆積したナノ粒子に対しSTEM/EDSを用いて構造解析を行った。3年目はプルーム観察、流体シミュレーション、構造解析の結果を総合的に検討した。
    バックグラウンドガス圧力が高い2000Pa以上では流体近似によるシミュレーションでプルームの衝突現象をよく近似できる。プルームが対向衝撃波と衝突するとプルームが逆方向に進展し、その影響で二つのプルームは混合しない。堆積物はナノ粒子凝集体とGeナノ粒子凝集体が結合したものであった。これはSiプルーム中でSiナノ結晶凝集体が、Geプルーム中でGeナノ結晶凝集体が形成され、その後Siナノ結晶凝集体とGeナノ結晶凝集体が結合することを示す。1000Pa以下では平均自由行程が長くなり流体近似でプルーム進展の振る舞いが十分再現できない。プルームは中央部で混合するため、プルームを分光してSiとGeの進展を観察しプルームの混合度合いを議論した。その結果、2つのプルームは衝突後混合し、その後対向衝撃波によって形成された流れによって広がることがわかった。500Paの時には堆積物は混晶ナノ粒子であり、混合プルーム中でナノ粒子が形成され、基板に到達したことが示された。これらの結果を基にバックグラウンドガス圧力の効果を衝撃波と平均自由行程で説明するモデルを提示した。

    researchmap

  • 超音速で進展する2つのプラズマの衝突過程を用いた複合ナノ粒子の創成

    2019.4 - 2021.3

    JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)

    　 More details

    ガス中でのパルスレーザーアブレーション(PLA)法はプルームと呼ばれるパルスレーザー誘起プラズマを用いたナノ粒子創成法として知られている。申請者は2種類の対向するプラズマ（プルーム）を衝突させるダブルパルスレーザーアブレーション(DPLA)法を用いた複合ナノ粒子の創成を提案している。最近、我々は対向プルームの膨張によって発生する衝撃波がプルームの進展に大きく影響することを見いだし、プラズマ衝突過程の制御によって複合ナノ構造の制御が可能であることを指摘している。本研究ではプラズマ衝突過程の測定によりプラズマ衝突過程を明らかにするとともに、プルームの速度・温度・圧力および複合ナノ粒子形成に与える影響を明らかにする。得られた結果から、プラズマ衝突過程のモデルを提案し、プラズマ衝突過程の制御による複合ナノ粒子生成を目指す。本研究は衝突プラズマ現象を手軽に実験することが可能である系という意味合いも持つ。

  • Synthesis of composite plasmonic photocatalysis in visible light operation by vapor-phase pulsed laser ablation

    2016.4 - 2020.3

    JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)

    Yoshida Takehito

    　 More details

    Plasmonic excitation phenomena of nanostructured metals have realized high performance of photocatalysts in the visible light operation. Pulsed laser ablation (PLA) is a candidate process to this purpose. We have formed TiO2 nanocrystalline films supporting Au or Ag nanoparticles by the PLA processes. We confirmed that the balled Au and Ag nanoparticles had the localized surface plasmonic resonance absorption band in the range of 510-610 nm and 400-490 nm, respectively.
    We clarified that the Au-supporting on TiO2 nanocrystalline films demonstrated visible-light-driven photocatalytic activities. In the case of Ag, there is a critical issue where Ag nanoparticles dissolute during chemical reactions. For this problem, encapsulating Ag nanoparticles in TiO2 films was suggested as one promising structure. We also clarified a novel structures which have (amorphous TiO2)/(Ag nanoparticles)/(anantase TiO2) multilayer structures, showed excellent visible light operations.

    researchmap

  • 2パルス励起プロセスを用いた非平衡的ナノ結晶成長制御

    2015.4 - 2018.3

    JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)

    　 More details

    2パルス励起プロセスを用いた非平衡的ナノ結晶成長制御

display all >>

To the head of this page.▲

Other External funds procured 【 display / non-display 】

  • 複合ナノクラスターによる高機能材料の創製とその応用

    2006.4 - 2007.3

    自治体  兵庫県ＣＯＥプログラム推進事業

  • ナノ結晶シリコンのレーザーアブレーション過程と表面生成機構

    2004.4 - 2005.3

    その他財団等  日本板硝子材料工学助成会

  • 生体機能性分子鎖による半導体ナノ結晶ネットワークの形成と電子物性の制御

    2003.4 - 2004.4

    その他財団等  倉田奨励金

  • シリコン薄膜へのナノ描画による物性制御

    2000.4 - 2001.3

    自治体  ひょうご科学技術協会　奨励研究助成

  • Siナノ結晶の非輻射再結合過程

    1999.4 - 2000.3

    その他財団等  稲盛財団助成金

display all >>

To the head of this page.▲

Joint and Contract research activities (Public) 【 display / non-display 】

  • 非平衡プロセスを用いた環境機能性ナノ材料の創成

    Offer organization：関西大学、阿南高専、奈良高専  Domestic Joint Research

    2011.4

    　 More details

    本研究は非平衡現象に着目した手法を用いてナノ材料の高機能化を目指すものである。材料形成時の動的過程を制御することができれば、新奇なナノ構造材料を創成するための革新的な技術となり得る。さらにナノ構造物質に対する非平衡な電子系の励起状態では多電子間の相互作用による機能性の向上が期待できる。そこで本研究では、これらの両面から非平衡励起状態の緩和の素過程の解明をおこなうことを目的とする。素過程の解明から材料作製、物性の解明、応用展開にわたる一連の研究を行うために協力関係が不可欠である。

  • 複合ナノクラスターによる高機能材料の創製とその応用

    Domestic Joint Research

    2006.7 - 2008.3

To the head of this page.▲

Preferred joint research theme 【 display / non-display 】

  • パルスレーザーメルティング

  • レーザーアブレーションによる薄膜作製、ナノ結晶作製

To the head of this page.▲
 

Committee Memberships 【 display / non-display 】

  • 2022   電気学会  レーザプロセッシングを利用して作製したナノ材料の応用技術調査専門委員会

    　 More details

  • 2021.8 - 2024.7   レーザプロセッシングを利用して作製したナノ材料の応用技術  委員

  • 2019.8 - 2022.7   レーザプロセッシングを用いたナノ材料制御技術調査専門委員会  委員長

  • 2019 - 2022   電気学会  レーザプロセッシングを用いたナノ材料制御技術調査専門委員会

    　 More details

  • 2016.5 - 2019.4   電気学会　ナノ材料作製のための最先端レーザプロセッシング　技術調査専門委員  委員

display all >>

To the head of this page.▲
 

Recommended URL 【 display / non-display 】

  • 半導体/電子デバイス物理

    http://kccn.konan-u.ac.jp/physics/semiconductor/

    Engineering in General

  • 甲南大学理工学部物理学科　半導体研究室

    http://www.phys.konan-u.ac.jp/Semicon/index.html

    Science and Technology in General

To the head of this page.▲