研究者業績

内田 寛

ウチダ ヒロシ  (Uchida Hiroshi)

基本情報

所属
上智大学 理工学部物質生命理工学科 教授
学位
修士(工学)(1997年3月 上智大学)
博士(工学)(2001年1月 東京工業大学)

連絡先
uchidahsophia.ac.jp
研究者番号
60327880
J-GLOBAL ID
200901055907958881
researchmap会員ID
1000367338

上智大学 理工学部物質生命理工学科 無機工業化学グループ

(上智大学大学院 理工学研究科理工学専攻 応用化学領域)

 

主要な研究テーマ:

  • 溶液プロセスを主体とした無機マイクロ・ナノ材料製造技術の研究開発(低温合成・組成制御・三次元加工・化学溶液堆積・水熱合成・超臨界流体)
  • エレクトロニクス&エネルギーデバイス用新規化合物の探索(誘電体・圧電体・半導体/高性能材料・環境調和型材料)

 

近年の活動内容:

  • 溶液プロセスによる高性能な強誘電体/圧電体薄膜の製造技術開発
  • 環境親和型強誘電体/圧電体薄膜材料の探索
  • 水熱合成プロセスによる無機材料薄膜の創製
  • 超臨界流体を用いた無機材料合成プロセスの開発


論文

 205
  • José P. B. Silva, Ruben Alcala, Uygar E. Avci, Nick Barrett, Laura Bégon-Lours, Mattias Borg, Seungyong Byun, Sou-Chi Chang, Sang-Wook Cheong, Duk-Hyun Choe, Jean Coignus, Veeresh Deshpande, Athanasios Dimoulas, Catherine Dubourdieu, Ignasi Fina, Hiroshi Funakubo, Laurent Grenouillet, Alexei Gruverman, Jinseong Heo, Michael Hoffmann, H. Alex Hsain, Fei-Ting Huang, Cheol Seong Hwang, Jorge Íñiguez, Jacob L. Jones, Ilya V. Karpov, Alfred Kersch, Taegyu Kwon, Suzanne Lancaster, Maximilian Lederer, Younghwan Lee, Patrick D. Lomenzo, Lane W. Martin, Simon Martin, Shinji Migita, Thomas Mikolajick, Beatriz Noheda, Min Hyuk Park, Karin M. Rabe, Sayeef Salahuddin, Florencio Sánchez, Konrad Seidel, Takao Shimizu, Takahisa Shiraishi, Stefan Slesazeck, Akira Toriumi, Hiroshi Uchida, Bertrand Vilquin, Xianghan Xu, Kun Hee Ye, Uwe Schroeder
    APL Materials 11(8) 2023年8月1日  査読有り
    Ferroelectric hafnium and zirconium oxides have undergone rapid scientific development over the last decade, pushing them to the forefront of ultralow-power electronic systems. Maximizing the potential application in memory devices or supercapacitors of these materials requires a combined effort by the scientific community to address technical limitations, which still hinder their application. Besides their favorable intrinsic material properties, HfO2–ZrO2 materials face challenges regarding their endurance, retention, wake-up effect, and high switching voltages. In this Roadmap, we intend to combine the expertise of chemistry, physics, material, and device engineers from leading experts in the ferroelectrics research community to set the direction of travel for these binary ferroelectric oxides. Here, we present a comprehensive overview of the current state of the art and offer readers an informed perspective of where this field is heading, what challenges need to be addressed, and possible applications and prospects for further development.
  • Yusuke Yamasaki, Yukie Yokota, Hiromi Shima, Hiroshi Funakubo, Hiroshi Uchida
    Journal of the Ceramic Society of Japan 131(7) 229-235 2023年7月1日  査読有り責任著者
  • Yusuke Yamasaki, Yukie Yokota, Hiromi Shima, Hiroshi Uchida
    Japanese Journal of Applied Physics 61(SN) SN1006-SN1006 2022年11月1日  査読有り責任著者
    Abstract Aiming at applications of ferroelectric and optical devices, we investigated the fabrication of one-axis-oriented lead zirconate titanate Pb(Zr,Ti)O3 (PZT) thin films on glass substrates with a processing temperature below the glass-transition point of the substrate. Chemical solution deposition (CSD)-derived PZT thin films with a preferential crystal orientation of (00l)/(h00)PZT were grown on an ITO/glass substrate with a crystalline buffer layer of calcium niobate Ca2Nb3O10 (ns-CN). This ns-CN buffer layer lowered the crystallization temperature of the CSD-derived thin films, resulting in crystalline PZT thin films with one-axis (00l) orientation and ferroelectricity of Pr = 4 μC cm−2 deposited on transparent glass substrates at a crystallization temperature of 500 °C.
  • Takahisa Shiraishi, Akinori Tateyama, Hiroshi Uchida, Hiroshi Funakubo
    Journal of the Ceramic Society of Japan 130(8) 621-626 2022年8月1日  査読有り
    Epitaxial films of (K,Na,Li)NbO3 with 10 over line m thickness and various Li contents were fabricated at 240 degrees C on (001)La:SrTiO3 substrates by a hydrothermal method, and their crystal structures and piezoelectric properties were investigated. The film thickness was controlled by varying the deposition time (up to 3.5 h) and the number of deposition cycles. Scanning electron microscopy observations showed that dense thick films were formed. X-ray diffraction (XRD) measurements showed that {001}c-oriented epitaxial films were deposited, and the outof-plane lattice constant changed with an increase in the nominal composition A = [LiOH]/([KOH] + [NaOH] + [LiOH]) of the alkaline source solution. High-temperature XRD measurement revealed that with an increase in A, the Curie temperature increased, while the orthorhombic-tetragonal phase transition temperature decreased from 210 to 120 degrees C. These structural changes indicate that the Li content in the thick films can be controlled by varying A. The dielectric properties depend on the measurement frequency, and the minimum relative dielectric permittivity at all frequencies was observed at A = 0.02. Curves of field-induced strain vs. electric field showed that the maximum normalized strain of Smax/Emax = 40 pm/V was observed at A = 0.03, indicating that Li substitution is an effective way to improve the piezoelectricity of the hydrothermally deposited (K,Na)NbO3 thick films. Interestingly, all thick films exhibited a piezoelectric response despite the applied electric field being lower than the coercive field. Moreover, the Smax/Emax value did not change significantly with an increasing applied electric field. These results suggest that the hydrothermally deposited (K,Na,Li)NbO3 thick films adopt a selfpolarized state without poling treatment. (c) 2022 The Ceramic Society of Japan. All rights reserved.
  • Lokadi Pierre Luhata, Christian Nanga Chick, Natsuki Mori, Kunihito Tanaka, Hiroshi Uchida, Takashi Hayashita, Toyonobu Usuki
    Molecules (Basel, Switzerland) 27(10) 2022年5月17日  
    The aqueous extract of the leaves of Odontonema strictum (OSM) is used in folk medicine for its antihypertensive properties, and it contains a wide range of secondary metabolites, mostly polyphenols such as verbascoside and isoverbascoside, which could play a major role in the preparation of silver nanoparticles. In this study, we aimed to prepare AgNPs for the first time using the OSM leaf extract (OSM-AgNPs) to investigate their free radical-scavenging potency against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydrogen peroxide (H2O2). Dynamic light scattering (DLS), UV/Vis, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS) were used to characterize the OSM-AgNPs. With a size around 100 nm and a ζ-potential of -41.1 mV, OSM-AgNPs showed a good stability and a better colloidal property due to electrostatic repulsion and the dispersity. The strong absorption peak at 3 keV in the EDX spectra indicated that silver was the major constituent. Additionally, the existence of silver atoms was confirmed by the Ag 3d5/2 peak around 367 eV in the XPS spectra. IC50 values of 116 μg/mL and 4.4 μg/mL were obtained for the scavenging activities of DPPH and H2O2, respectively. The synthetic OSM-AgNPs can be further exploited as potential antioxidant agents.

MISC

 54

書籍等出版物

 5
  • 大倉利典, 小嶋, 芳行, 相澤, 守, 内田, 寛, 柴田, 裕史 (担当:共著)
    培風館 2023年6月7日 (ISBN: 4563046418)
  • (担当:分担執筆, 範囲:p.94-99, 「水熱合成技術を利用した非鉛系ペロブスカイト型酸化物エピタキシャル構造体の高速製造プロセス」)
    2020年12月10日
  • 内田 寛 (担当:分担執筆, 範囲:p.389-399, 第10章第4節「ペロブスカイト型強誘電体・圧電体薄膜の結晶配向性制御による分極特性の改善」)
    情報通信協会 2020年8月31日
  • 内田 寛 (担当:分担執筆, 範囲:p.389-399 「化学的薄膜堆積 . 超臨界流体を用いたエッチング加工」)
    コロナ社 2012年9月6日 (ISBN: 9784339008371)
  • (担当:分担執筆, 範囲:p.116-119, 「エピタキシャル薄膜における応力解析技術」)
    2001年9月20日

講演・口頭発表等

 92

共同研究・競争的資金等の研究課題

 20

産業財産権

 8