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- Title
Photoresponsive Nanosheets of Polyoxometalates Formed by Controlled Self-Assembly Pathways.
- Authors
Ishiba, Keita; Noguchi, Takao; Iguchi, Hiroaki; Morikawa, Masa ‐ aki; Kaneko, Kenji; Kimizuka, Nobuo
- Abstract
Anionic Keggin polyoxometalates (POMs) and ether linkage-enriched ammonium ions spontaneously self-assemble into rectangular ultrathin nanosheets in aqueous media. The structural flexibility of the cation is essential to form oriented nanosheets; as demonstrated by single-crystal X-ray diffraction measurements. The difference in initial conditions exerts significant influence on selecting for self-assembly pathways in the energy landscape. Photoillumination of the POM sheets in pure water causes dissolution of reduced POMs, which allowed site-specific etching of nanosheets using laser scanning microscopy. By contrast, photoetching was suppressed in aqueous AgNO3 and site-selective deposition of silver nanoparticles occurred as a consequence of electron transfer from the photoreduced POMs to Ag+ ions on the nanosheet surface.
- Subjects
POLYOXOMETALATES; AMMONIUM ions; SILVER nanoparticles; ION analysis; IONS spectra
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 11, p3020
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201612473