Characterization of Nanostructured Semiconductors with Different Morphologies and Application to Gas Sensors

• Project/Area Number: 18510095
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: The University of Electro-Communications
• Principal Investigator: SHEN Qing The University of Electro-Communications, 電気通信学部, 助教 (50282926)
• Project Period (FY): 2006 – 2009
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
• Keywords: ナノ材料評価 / ナノ構造半導体 / 表面形態 / 熱拡散率 / ガスセンサー / ポーラスシリコン / CdSe量子ドット / 光音響法 / 過渡回折格子法 / 熱物性 / 光熱変換 / 酸化物半導体

Research Abstract

本研究では、(1)周期的なナノ構造を有するポーラスシリコン、(2)ナノ構造を有する酸化物半導体(TiO_2)薄膜を対象として、その熱伝導率を非接触的で測定できる方法(透過型光音響法と改良型過渡回折格子法)を確立した。ナノ構造の表面形態の違いや表面に吸着した分子や半導体量子ドットおよび金属ナノ粒子により熱拡散率が顕著に変化することを見出した。従来のガス吸着による電気抵抗変化の測定法の代わりに、ガス分子吸着による熱拡散率の変化を利用するガスセンシングへの応用に関する基礎研究を行った。

Research Products

• [Journal Article] Electric Characteristics of Li_2O- Doped TiO_2 Nanocrystalline Film and its Application to Dye-Sensitized Solar Cels (2009)
  • Author(s): M. Nada, T. Gonda, Q. Shen, H. Shimada, T. Toyoda, and N. Kobayashi
  • Journal Title: Jpn. J. Appl. Phys Vol.48
  • Peer Reviewed
• [Journal Article] Photoacoustic Spectra of Au Quantum Dots Adsorbed on Nanaostructured TiO_2 Electrodes together with the Photoelectrochem-ical Current Characteristics (2009)
  • Author(s): T. Toyoda, S. Tsugawa, and Q. Shen
  • Journal Title: J. Appl. Phys Vol.105
  • Peer Reviewed
• [Journal Article] Terahertz Reflection Response Measurement Using a Phonon Polariton Wave (2009)
  • Author(s): H. Inoue, K. Katayama, Q. Shen, T. Toyoda, and K. A. Nelson
  • Journal Title: J. Appl. Phys Vol.105
  • Peer Reviewed
• [Journal Article] Electric Characteristics of Li20-Doped TiO2 Nanocrystalline Films AND Its Application to Dye-Sensitized Solar Cells (2009)
  • Author(s): M. Nada
  • Journal Title: Jpn. J. Appl. Phys. 48 Pages: 25505-25505
  • Peer Reviewed
• [Journal Article] Terahertz reflection response measurement using a phonon polariton wabe (2009)
  • Author(s): H. Inoue
  • Journal Title: J. Appl. Phys. 105 Pages: 54902-54902
  • Peer Reviewed
• [Journal Article] Photoacoustic spectra of Au quantum dots adsorbed on nanostructured TiO_2 electrodes together with the photoelectrochemical current characteristics (2009)
  • Author(s): T. Toyoda
  • Journal Title: J. Appl. Phys. 105 Pages: 34314-34314
  • Peer Reviewed
• [Journal Article] Room-temperature absorption edge of InGaN/GaN quantum wells characterized by photoacoustic measurement (2009)
  • Author(s): Y. Takeda
  • Journal Title: Jpn. J. Appl. Phys. 47 Pages: 8805-8807
  • Peer Reviewed
• [Journal Article] ナノ構造TiO_2電極に吸着したAu量子ドットの光音響スペクトル (2009)
  • Author(s): 豊田太郎
  • Journal Title: 超音波TECHNO 21 Pages: 65-69
• [Journal Article] Effect of ZnS Coating on the Photovoltaic Properties of CdSe Quantum Dot Sensitized Solar Cells (2008)
  • Author(s): Q. Shen, J. Kobayashi, L. J. Diguna, and T.Toyoda
  • Journal Title: J. Appl. Phys Vol.103 Pages: 84304-1
  • Peer Reviewed
• [Journal Article] Characterization of Electron Transferfrom CdSe Quantum Dots to Nanostructured TiO2 Electrode Using a Near Field Heterodyne Transient Grating (2008)
  • Author(s): Q. Shen, K. Katayama, T. Sawada, and T. Toyoda
  • Journal Title: Thin Solid Films Vol.516 Pages: 5927-5927
  • Peer Reviewed
• [Journal Article] Generation and detection of Tunable Phonon Polaritons Using a Single Transmission Grating (2008)
  • Author(s): K. Katayama, H. Inoue, H. Sugiya, Q. Shen, T. Toyoda, and K. Nelson
  • Journal Title: Appl. Phys. Lett Vol.92 Pages: 31906-31906
  • Peer Reviewed
• [Journal Article] Characterization of electron transferfrom CdSe quantum dots to nanostructured TiO_2 electrode using a near-field heterodyne transient grating (2008)
  • Author(s): Q. Shen
  • Journal Title: J. Appl. Phys. 103 Pages: 84304-84304
  • Peer Reviewed
• [Journal Article] Characterization of electron transferfrom CdSe quantum dots to nanostructured TiO_2 electrode using a near-field heterodyne transient grating (2008)
  • Author(s): Q. Shen
  • Journal Title: Thin Solid Films 516 Pages: 5927-5930
  • Peer Reviewed
• [Journal Article] Characterization of electron transferfrom CdSe quantum dots to nanostructured TiO_2 electrode using a near-field heterodyne transient grating (2008)
  • Author(s): Q. Shen
  • Journal Title: Thin Solid Films In press
  • Peer Reviewed
• [Journal Article] Effect of ZnS coating on the photovoltaic properties of CdSe quantumdot-sensitized solar cells (2008)
  • Author(s): Q. Shen
  • Journal Title: J. Appl. Phys. 103
  • Peer Reviewed
• [Journal Article] Tunable phonon polarization generation using (2008)
  • Author(s): K. Katayama
  • Journal Title: Appl. Phys. Lett. 92
  • Peer Reviewed
• [Journal Article] Phonon Polariton Generation and Detection Using Near Field Heterodyne Transient Grating Method (2007)
  • Author(s): K. Katayama, Q. Shen, T. Toyoda, and K. Nelson
  • Journal Title: Appl. Phys. Lett Vol.90 Pages: 171117-171117
  • Peer Reviewed
• [Journal Article] Optical Absorption and Ultrafast Carrier Dynamics Characterization of CdSe Quantum Dots Deposited on Different Morphologies of Nanostructured TiO_2 Films (2007)
  • Author(s): L.J. Diguna, Q. Shen. A. Sato, K. Katayama, T. Sawada, and T. Toyoda
  • Journal Title: Mater. Sci. Eng C Vol.27 Pages: 1514-1520
  • Peer Reviewed
• [Journal Article] Crystal Growth of CdSe Quantum Dots Adsorbed on Nano-particle, Inverse Opal, and Nanotube TiO_2 Photoelectrodes Characterized by Photoacoustic Spectroscopy (2007)
  • Author(s): T. Toyoda, T. Uehara, R. Suganuma, S. Tamura, A. Sato, K. Yamamoto, Q. Shen, and N. Kobayashi
  • Journal Title: Jpn. J. Appl. Phys Vol.46 Pages: 4616-4621
  • Peer Reviewed
• [Journal Article] High Efficiency of CdSe Quantum Dot Sensitized TiO_2 Inverse Opal Solar Cells (2007)
  • Author(s): L.J. Diguna, Q. Shen, J. Kobayashi, and T.Toyoda
  • Journal Title: Appl. Phys. Lett Vol.91 Pages: 23116-23116
  • Peer Reviewed
• [Journal Article] Optical Absorption, Photosensitization, and Ultrafast Carrier Dynamic Investigations of CdSe Quantum Dots Grafted onto Nanostructured SnO_2 Electrode and Fluorine Doped Tin Oxide(FTO)Glass (2007)
  • Author(s): Q. Shen, M. Yanai, K. Katayama, T. Sawada,and T. Toyoda
  • Journal Title: Chem. Phys. Lett Vol.442 Pages: 89-96
  • Peer Reviewed
• [Journal Article] Phonon Polariton Generation and Detection Using Near-Field Heterodye Transient Grating Method (2007)
  • Author(s): K. Katayama
  • Journal Title: Appl. Phys. Lett. 90 Pages: 171117-171119
  • Peer Reviewed
• [Journal Article] Optical Absorption and Ultrafast Carrier Dynamics Characterization of CdSe Quantum Dots Deposited on Different Morphologies of Nanostructured TiO_2 Films (2007)
  • Author(s): L. J. Diguna
  • Journal Title: Mater. Sci. Eng. C 27 Pages: 1514-1520
  • Peer Reviewed
• [Journal Article] Crystal Growth of CdSe Quantum Dots Adsorbed on Nano-particle, Inverse Opal, and Nanotube TiO_2 Photoelectrodes Characterized by Photoacoustic Spectroscopy (2007)
  • Author(s): T. Toyoda
  • Journal Title: Jpn. J. Appl. Phys. 46 Pages: 4616-4621
  • Peer Reviewed
• [Journal Article] High Efficiency of CdSe Quantum-Dot-Sensitized TiO_2 Inverse Opal Solar Cells (2007)
  • Author(s): L. J. Diguna
  • Journal Title: Appl. Phys. Lett. 91 Pages: 23116-23118
  • Peer Reviewed
• [Journal Article] Optical Absorption, Photosensitization, and Ultrafast Carrier Dynamic Investigations of CdSe Quantum Dots Grafted onto Nanostructured SnO_2 Electrode and Fluorine-Doped Tin Oxide (FTO) Glass (2007)
  • Author(s): Q. Shen
  • Journal Title: Chem. Phys. Lett. 442 Pages: 89-96
  • Peer Reviewed
• [Journal Article] The Influence of Chemical Post Etching and UV Irradiation on the Optical Absorption and Thermal Diffusivity of Porous Silicon Studied by Photoacoustic Technique (2006)
  • Author(s): Q. Shen, M. Inoguchi, T. Toyoda
  • Journal Title: Thin Solid Films Vol.499 Pages: 161-167
  • Peer Reviewed
• [Journal Article] Photoacoustic and Photoelectrochemical Characterization of CdSe Sensitized TiO2 Electrodes Composed of Nanotubes and Nanowires (2006)
  • Author(s): Q. Shen, T. Sato, M. Hashimoto, C.C.Chen, T. Toyoda
  • Journal Title: Thin Solid Films Vol.499 Pages: 299-305
  • Peer Reviewed
• [Journal Article] Photoexcited Hole Dynamics of TiO_2 Nanocrystalline Films characterized using a Lens Free Heterodyne Detection Transient Grating Technique (2006)
  • Author(s): Q. Shen, K. Katayama, T. Sawada, M.Yamaguchi, Y. Kumagai, and T. Toyoda
  • Journal Title: Chem. Phys. Lett 419 Pages: 464-468
  • Peer Reviewed
• [Journal Article] Optical absorption, photoelectrochemical, and ultrafast carrierdynamic investigations of TiO_2 electrodes composed of nanotubes and nanowires sensitized with CdSe quantum dots (2006)
  • Author(s): Q. Shen, K. Katayama, T. Sawada, M.Yamaguchi and T. Toyoda
  • Journal Title: Jpn. J. Appl. Phys Vol.45 Pages: 5569-5574
  • Peer Reviewed
• [Journal Article] Photoacoustic and photoelectrochemical characterization of inverse opal TiO_2 sensitized with CdSe quantum dots (2006)
  • Author(s): L.J. Diguna, M. Murakami, A. Sato, Y. Kumagai, T. Ishihara, N. Kobayashi, Q. Shen and T. Toyoda
  • Journal Title: Jpn. J. Appl. Phys Vol.45 Pages: 5563-5568
  • Peer Reviewed
• [Journal Article] Carrier Dynamics in Porous Silicon Studied with a Near-Field Heterodyne Transient Grating Method (2006)
  • Author(s): M. Yamaguchi, K. Katayama, Q. Shen, T. Toyoda and T. Sawada
  • Journal Title: Chem. Phys. Lett Vol.427 Pages: 192-196
  • Peer Reviewed
• [Journal Article] Optical absorption, photoelectrochemical, and ultrafast carrier dynamic investigations of TiO_2 electrodes composed of nanotubes and nanowires sensitized with CdSe quantum dots (2006)
  • Author(s): Q.Shen
  • Journal Title: Japanese Journal of Applied Physics 45 Pages: 5569-5574
• [Journal Article] The Influence of Chemical Post-Etching and UV Irradiation on Optical Absorption and Thermal Diffusivity of Porous Silicon Studied by Photoacoustic Technique (2006)
  • Author(s): Q.Shen
  • Journal Title: Thin Solid Films 499 Pages: 161-167
• [Journal Article] Photoacoustic and Photoelectrochemical Characterization of CdSe-Sensitized TiO_2 Electrodes Composed of Nanotubes and Nanowires (2006)
  • Author(s): Q.Shen
  • Journal Title: Thin Solid Films 499 Pages: 299-305
• [Journal Article] Photoexcited Hole Dynamics of TiO_2 Nanocrystalline Films characterized using a Lens-Free Heterodyne Detection Transient Grating Technique (2006)
  • Author(s): Q.Shen
  • Journal Title: Chemical Physics Letters 419 Pages: 464-468
• [Journal Article] Carrier Dynamics in Porous Silicon Studied with a Near-Field Heterodyne Transient Grating Method (2006)
  • Author(s): M.Yamaguchi
  • Journal Title: Chemical Physics Letters 427 Pages: 192-196
• [Journal Article] Optical Absorption and Ultrafast Carrier Dynamics Characterization of CdSe Quantum Dots Deposited on Different Morphologies of Nanostructured TiO_2 Films
  • Author(s): Lina J Diguna
  • Journal Title: Mater. Sci. Eng. C (印刷中)
• [Presentation] 光音響分光法によるCdSe量子ドットを吸着したナノ結晶Siの熱拡散率評価 (2008)
  • Author(s): 小鹿倉淳、沈青、豊田太郎
  • Organizer: 第29回超音波エレクトロニクスシンポジウム
  • Place of Presentation: 仙台
  • Year and Date: 2008-11-11
• [Presentation] 光音響分光法によるCdSe量子ドットを吸着したナノ結晶Siの熱拡散率評価 (2008)
  • Author(s): 小鹿倉淳、沈青、豊田太郎
  • Organizer: 第29回日本熱物性シンポジウム
  • Place of Presentation: 東京
  • Year and Date: 2008-10-08
• [Presentation] ナノ構造TiO_2電極に吸着したAu量子ドットの光音響スペクトルと過渡応答評価 (2008)
  • Author(s): 沈青、片山健二、澤田嗣郎、豊田太郎
  • Organizer: 第29回日本熱物性シンポジウム
  • Place of Presentation: 東京
  • Year and Date: 2008-10-08
• [Presentation] CdSe量子ドットを吸着したTiO_2逆オパール電極の光音響スペクトルと反射特性 (2008)
  • Author(s): Lina J. Diguna, 鮎沢康正、沈青、豊田太郎
  • Organizer: 第29回日本熱物性シンポジウム
  • Place of Presentation: 東京
  • Year and Date: 2008-10-08
• [Presentation] 光音響分光法によるCdSe量子ドットを吸着したポーラスシリコンの熱物性評価 (2008)
  • Author(s): 小鹿倉淳、沈青、豊田太郎
  • Organizer: 超音波学会
  • Place of Presentation: 東京
  • Year and Date: 2008-04-25
• [Presentation] Characterization of electron amd hole dynamics in CdSe and CdS quantum dots adsorbed onto nanostructured TiO_2 electrodes using near-field heterodyne transient grating technique (2008)
  • Author(s): Q. Shen
  • Organizer: 2008 Material Research Society Spring Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2008-03-23
• [Presentation] Characterization of nanocrystalline Si using photoacoustic technique (2008)
  • Author(s): Q. Shen
  • Organizer: 2008 Material Research Society Spring Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2008-03-23
• [Presentation] Effects of surface modification on photovoltaic properties of CdSe quantum dot-sensitized TiO_2 inverse opal solar cells (2007)
  • Author(s): L. J. Diguna, Q. Shen, J. Kobayashi and T.Toyoda
  • Organizer: Abstracts of the International PVSEC-17
  • Place of Presentation: Fukuoka(136-137)
  • Year and Date: 2007-12-03
• [Presentation] Dependence of the photovoltaic properties of CdSe quantum dot-sensitized solar cells on the thickness of TiO_2 electrodes (2007)
  • Author(s): T. Toyoda, T. Uehada, L. J. Diguna and Q. Shen
  • Organizer: Abstracts of the International PVSEC-17
  • Place of Presentation: Fukuoka(1181-1182)
  • Year and Date: 2007-12-03
• [Presentation] 光音響法によるナノ結晶Si膜の熱物性評価 (2007)
  • Author(s): 沈 青
  • Organizer: 第28回超音波エレクトロニクスシンポジウム
  • Place of Presentation: つくば
  • Year and Date: 2007-11-14
• [Presentation] 結晶型の異なるナノ構造TiO_2電極における光音響スペクトルと過渡電流特性 (2007)
  • Author(s): 沈 青
  • Organizer: 第28回超音波エレクトロニクスシンポジウム
  • Place of Presentation: つくば
  • Year and Date: 2007-11-14
• [Presentation] Characterization of carrier dynamics in semiconductor nanomaterials using near-field heterodyne transient grating method (2007)
  • Author(s): Q. Shen, K. Katayama, T. Sawada and T. Toyoda
  • Organizer: Abstracts of the 2007 Internatinal Microprocesses and Nanotechnology Conference
  • Place of Presentation: Kyoto, invited
  • Year and Date: 2007-11-05
• [Presentation] 光音響分光法を用いたポーラスシリコンの熱物性評価-その2- (2007)
  • Author(s): 加藤侑志、沈青、豊田太郎
  • Organizer: 第54回応用物理学関係連合講演会講演予稿集
  • Place of Presentation: 東京(1522)
  • Year and Date: 2007-03-27
• [Presentation] CdSe量子ドット増感したナノ構造TiO_2電極における光電変換効率の評価 (2007)
  • Author(s): 沈青、小林純也、Lina J Diguna、豊田太郎
  • Organizer: 第54回応用物理学関係連合講演会講演予稿集
  • Place of Presentation: 東京(690)
  • Year and Date: 2007-03-27
• [Presentation] ZnSを保護膜としたCdS量子ドット増感型太陽電池の光電変換特性 (2007)
  • Author(s): 佐藤彰、小林純也、沈青、豊田太郎
  • Organizer: 第54回応用物理学関係連合講演会講演予稿集
  • Place of Presentation: 東京(690)
  • Year and Date: 2007-03-27
• [Presentation] 光音響分光法によるCdSe量子ドット吸着したポーラスシリコンの熱物性評価 (2007)
  • Author(s): 沈 青
  • Organizer: 第55回応用物理学関係連合講演会
  • Place of Presentation: 東京
  • Year and Date: 2007-03-27
• [Presentation] Characterization of carrier dynamics in semiconductor nanomaterials using near-field heterodyne transient grating method (2007)
  • Author(s): Q. Shen
  • Organizer: the 2007 Internatinal Microprocesses and Nanotechnology Conference
  • Place of Presentation: Kyoto, Japan
• [Book] 電子材料ハンドブック (2006)
  • Author(s): 沈 青(共著)
  • Publisher: 朝倉書店