Extended wide-gap semiconductors for efficient photocatalytic activity

• Project/Area Number: 15K13763
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Energy-related chemistry
• Research Institution: Gakushuin University (2016-2018); Osaka University (2015)
• Principal Investigator: Saito Yuika 学習院大学, 理学部, 教授 (90373307)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 顕微分光 / 半導体ナノ材料 / 紫外レーリー散乱分光 / 光触媒 / バンドギャップ / 半導体光触媒 / フォトルミネッセンス / 単一ナノ粒子計測 / レーリー散乱 / 紫外光 / 量子サイズ効果 / 共鳴レーリー散乱分光 / 半導体ナノ粒子 / 分光学 / ナノ構造化

Outline of Final Research Achievements

Individual semiconductor photocatalytic nanocrystals with bandgaps in the near to deep ultraviolet (NUV-UV) wavelength range were investigated using UV resonant Rayleigh scattering spectroscopy.Tungsten trioxide (WO3) ,one of the candidate for visible photo-catalyst acting as a hydrogen creation were used as the sample.　Individual WO3 nanoparticles were measured by UV resonant Rayleigh scattering spectroscopy. The scattering peaks of each nanoparticle show variation indicating that the modification of the band-gap due to the particle size, shape, crystallization and the density of defects. Generally, as the size of the nanoparticle decreases, we observed the increase of the band-gap (band-edge) energy, which means that the band-gap energy was control by nano-structures.

Academic Significance and Societal Importance of the Research Achievements

光触媒WO3は安定性と安全性が優れておりこれまで広く研究されている。バンドギャプ拡張光触媒は、従来よりもポテンシャルエネルギーの大きい酸化反応を進行することができるので、難分解性有害物質Noxやダイオキシンの分解に活用することができる。応用例として、年間50万台に及ぶ乗用車や特殊車両の排気ガスフィルター、日本に9700カ所存在するトンネルの通気孔、化学プラントの煤煙防止設備などに導入することができれば、将来的に環境浄化に大きな威力を発揮することが期待できる。本研究は、安全性と安定性が保証されている従来の光触媒材料の可能性を大きく広げるものである。

Research Products

• [Journal Article] Tapered arrangement of metallic nanorod chains for magnified plasmonic nanoimaging (2019)
  • Author(s): Ohashi Y, Ranjan B, Saito Y, Umakoshi T, Verma P
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 2656-2663
  • DOI: 10.1038/s41598-019-39624-1
  • Peer Reviewed
• [Journal Article] Plasmonic transfer of near-field light from subwavelength objects through a gold-nanorod chain (2018)
  • Author(s): Ohashi Y, Ranjan B, Saito Y, Umakoshi T, Verma P
  • Journal Title: Applied Physics Express Volume: 11 Issue: 10 Pages: 102001-102005
  • DOI: 10.7567/apex.11.102001
  • NAID: 210000136367
  • Peer Reviewed
• [Journal Article] Direct and Indirect Interlayer Excitons in a van der Waals Heterostructure of hBN/WS2/MoS2/hBN (2018)
  • Author(s): Okada M, Kutana A, Kureishi Y, Kobayashi Y, Saito Y, Saito T, Watanabe K, Taniguchi T, Gupta S, Miyata Y, Yakobson BI, Shinohara H, Kitaura R
  • Journal Title: ACS Nano Volume: 12 Issue: 3 Pages: 2498-2505
  • DOI: 10.1021/acsnano.7b08253
  • NAID: 120006496402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Raman imaging of lipid bilayer membrane by surface enhanced Raman scattering, SPIE Biomedical Vibrational Spectroscopy (2018)
  • Author(s): Mori M, Abe S, Kondo T, Saito Y
  • Journal Title: Proc. SPIE Volume: 10490 Pages: 1049001-1049009
  • DOI: 10.1117/12.2286839
  • Peer Reviewed
• [Journal Article] Highly efficient plasmonic tip design for plasmon nanofocusing in near-field optical microscopy (2016)
  • Author(s): T. Umakoshi, Y. Saito, and P. Verma
  • Journal Title: Nanoscale Volume: 8 Issue: 10 Pages: 5634-5640
  • DOI: 10.1039/c5nr08548a
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Near-field absorption imaging by Raman nano light source (2016)
  • Author(s): Ryo Kato, Yuika Saito, Prabhat Verma
  • Journal Title: RSC Advaces Volume: 6 Issue: 114 Pages: 113139-113143
  • DOI: 10.1039/c6ra24428a
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Nano-imaging with Near-field Optical Microscope (2016)
  • Author(s): 齊藤結花 馬越貴之
  • Journal Title: Hyomen Kagaku Volume: 37 Issue: 12 Pages: 616-621
  • DOI: 10.1380/jsssj.37.616
  • NAID: 130005434928
  • ISSN: 0388-5321, 1881-4743
  • Peer Reviewed
• [Journal Article] Direct electron density modulation of surface plasmons with a scanning electron microscope (2015)
  • Author(s): Yuika Saito, Katsumasa Fujita
  • Journal Title: Applied Physics Express Volume: 8 Issue: 1 Pages: 015001-015001
  • DOI: 10.7567/apex.8.015001
  • NAID: 210000137357
  • Peer Reviewed
• [Journal Article] Temperature-dependent UV-resonance Raman Sectroscopy (2015)
  • Author(s): Hikaru Yoshino, Yuika Saito, Yasuaki Kumamoto, Atsushi Taguchi, Prabhat Verma, Satoshi Kawata
  • Journal Title: Analytical Science Volume: 31 Pages: 451-454
  • Peer Reviewed
• [Journal Article] Optical antennas for tunable enhancement in tip-enhanced Raman spectroscopy imaging (2015)
  • Author(s): Imad Maouli, Atsushi Taguchi, Yuika Saito, Satoshi Kawata, and Prabhat Verma
  • Journal Title: Applied Physics Express Volume: 8 Issue: 3 Pages: 032401-032401
  • DOI: 10.7567/apex.8.032401
  • NAID: 210000137427
  • Peer Reviewed
• [Presentation] Individual semiconductor nano-particles evaluated by UV spectroscopy (2019)
  • Author(s): Y. Saito, T. Kondo, K. Hirose, M. Hanazawa
  • Organizer: 日本分光学会紫外フロンティア分光部会
  • Invited
• [Presentation] UV Rayleigh Scattering Spectroscopy of Semiconductor Nano-particles (2018)
  • Author(s): Y.Saito, T. Kondo, K. Hirose,M. Hanazawa, R. Kojima
  • Organizer: SciX2018
  • Int'l Joint Research / Invited
• [Presentation] ラマンイメージングによるP3HT/PCBMバルクヘテロ型有機混合薄膜の固体構造の評価 (2018)
  • Author(s): 森基彰, 石渡瑞枝, 近藤崇博, 齊藤結花
  • Organizer: 応用物理学会 第79回秋季学術講演会
• [Presentation] 蒸着金薄膜の微細化による表面増強ラマン散乱活性基板 の開発 (2018)
  • Author(s): 近藤崇博,富田輝,齊藤結花
  • Organizer: 応用物理学会第79回秋季学術講演会
• [Presentation] 三酸化タングステン単一ナノ粒子のバンドギャップ観測 (2018)
  • Author(s): 広瀬健太,花澤真優,近藤崇博,齊藤結花
  • Organizer: 応用物理学会第79回秋季学術講演会
• [Presentation] Raman imaging of lipid bilayer membrane by surface enhanced Raman scattering (2018)
  • Author(s): M. Mori, S.Abe, T.Kondo, Y.Saito
  • Organizer: SPIE Photonics West 2018
  • Int'l Joint Research
• [Presentation] Laser ablation in water for Sn-based nanomaterials synthesis by millisecond-pulsed laser (2018)
  • Author(s): T. Kondo, S. A. Kulinich, Y. Saito, S. Iwamori
  • Organizer: SPIE Photonics West 2018
  • Int'l Joint Research
• [Presentation] Individual nano-particles probed by resonant Rayleigh scattering spectroscopy (2018)
  • Author(s): 広瀬健太、近藤崇博、齊藤結花
  • Organizer: 応用物理学会第65回春季学術講演会
• [Presentation] 表面増強ラマン散乱を用いた脂質二重膜のラマンイメージング (2017)
  • Author(s): 森基彰、安倍駿介、近藤崇博、齊藤結花
  • Organizer: 応用物理学会第78回秋季学術講演会
• [Presentation] Improvement of deep-UV photocatalytic effect by spectroscopic analysis (2016)
  • Author(s): Yuika Saito
  • Organizer: SciX 2016 (The Great Scientific eXcahnge)
  • Place of Presentation: USA, Mineapollise
  • Year and Date: 2016-09-18
  • Int'l Joint Research / Invited
• [Presentation] 新紫外プラズモニクスと半導体光触媒 (2016)
  • Author(s): 齊藤結花
  • Organizer: 日本分光学会遠紫外分光部会第1回講演会
  • Place of Presentation: 大阪府大阪市 関西学院大学梅田キャンパス
  • Year and Date: 2016-01-20
  • Invited
• [Presentation] 近接場ラマン顕微鏡: Near-field Raman microscope (2016)
  • Author(s): 齊藤結花
  • Organizer: SIMSと関連技術による化学イメージング
  • Place of Presentation: 東京
  • Invited
• [Book] Recent developments in plasmon-supported Raman spectroscopy:Chapter 12 Tip-Enhanced Raman Scattering of Nanocarbons (2018)
  • Author(s): Sanpon Vantasin, Yoshito Okuno, Yuika Saito, Yukihiro Ozaki ; K.Kneipp, T.Zhongqun, Y. Ozaki ed.
  • Total Pages: 512
  • Publisher: World Scientific
  • ISBN: 9781786344236
• [Book] Far and Deep UV spectroscopy (2015)
  • Author(s): Satoshi Kawata, Yukihiro Ozaki
  • Total Pages: 174
  • Publisher: Springer