Crystalline boron monosulfide nanosheets with tunable bandgaps

Autor:	Takahiro Kondo, Masayuki Toyoda, Tomoharu Tokunaga, Keisuke Miyazaki, Susumu Saito, Koji Horiba, Takashi Taniguchi, Takeaki Sakurai, Takeshi Fujita, Hideo Hosono, Mariana S. L. Lima, Kenji Watanabe, Takuya Masuda, Linghui Li, Satish Laxman Shinde, Kyosuke Matsushita, Eiji Nishibori, Ryota Ishibiki, Masahiro Miyauchi, Masashi Miyakawa, Haruki Kusaka, Akiyasu Yamamoto
Rok vydání:	2021
Předmět:	Materials science Absorption spectroscopy Renewable Energy Sustainability and the Environment Band gap chemistry.chemical_element General Chemistry Exfoliation joint Hydrogen storage chemistry Chemical engineering Photocatalysis General Materials Science Luminescence Boron Nanosheet
Zdroj:	Journal of Materials Chemistry A. 9:24631-24640
ISSN:	2050-7496 2050-7488
DOI:	10.1039/d1ta03307g
Popis:	Two-dimensional (2D) boron monosulfide (BS) nanosheets are predicted to have several stable phases and unique electronic structures, endowing them with interesting attributes, including superconducting, thermoelectric, and hydrogen storage properties. In this paper, we report the experimental realization of 2D BS nanosheets by the physical exfoliation of rhombohedral boron monosulfide (r-BS). Moreover, we demonstrate the facile separation of a mixture of 2D BS nanosheets and the r-BS powder in acetonitrile; the former were selectively separated as a dispersion in the supernatant, whereas the latter remained in the precipitate. In addition, density functional theory calculations reveal a clear dependence of the bandgap energy (Eg) on the number of layers of stacked BS nanosheets, where Eg for BS nanosheets is approximately 1.0 eV higher than that for r-BS. Atomic force microscopy, cathode luminescence, ultraviolet-visible absorption spectroscopy, and excitation emission matrix experiments revealed a consistent bandgap difference of approximately 1.0 eV between the BS nanosheets and r-BS. We also demonstrate the applications based on the properties that originated from the difference in the bandgap between r-BS and BS nanosheets using photoelectrochemical current switching. These results indicate that the nanosheet bandgap can be tuned to a desired value by controlling the number of stacked 2D BS nanosheets. Therefore, BS nanosheets are promising non-metal 2D materials for applications requiring bandgap control, such as electronics and photocatalysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9f4496557d557075a44332a8364f0ae2 https://doi.org/10.1039/d1ta03307g Zobrazit plný text záznamu