期刊
GLOBAL CHALLENGES
卷 2, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/gch2.201700105
关键词
catalysts; layered materials; layered semiconductors; metal nanoparticles; near-infrared
资金
- Suzuki-Zaidan Research Foundation, JSPS KAKENHI [17K19173]
- JSPS [JP16H06441, 16H06439]
- NIMS Microstructural Characterization Platform (NMCP) as a program of Nanotechnology Platform of the MEXT (Ministry of Education, Culture, Sports, Science, and Technology)
- join usage/research program of the Institute of Material and Systems for Sustainability (IMaSS), Nagoya University
- Grants-in-Aid for Scientific Research [17H05477, 17H06439, 17K19173] Funding Source: KAKEN
The synthesis of silver nanoparticles (AgNPs) within the interlayer space of transparent layered titania nanosheet (TNS) films is investigated. A considerable number of silver ions (approximate to 70% against the cation exchange capacity of the TNS) are intercalated in the TNS films using methyl-viologen-containing TNSs as a precursor. The silver ion (Ag+)-containing TNS films are treated with aqueous sodium tetrahydroborate (NaBH4), resulting in a gradual color change to bright blue. Various structural analyses clearly show that crystalline AgNPs are generated within the interlayer space of the TNSs. The NaBH4-treated films show intense and characteristic near-infrared (NIR) extinction spectra up to 1800 nm. The tability of the AgNPs within the TNS against oxygen and moisture is also investigated, and 96% and 82% of the AgNPs remain after standing in air for 1 month and 1 year, respectively. The NIR extinctions of the AgNP-containing TNS films are further extended by employing different preparation procedures, for example, using sintered TNS films as starting materials and irradiating the Ag+-containing TNSs with ultraviolet (UV) light. The obtained AgNP-containing TNS films exhibit photochemical activities in the production of hydrogen from ammonia borane under visible-light irradiation and the decomposition of nitrogen monoxide under UV-light irradiation.
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