Rahman Md Ashiqur, Yomogida Yohei, Ahad Abdul, Ueji Kan, Nagano Mai, Ihara Akane, Nishidome Hiroyuki, Omoto Mikito, Saito Shigeki, Miyata Yasumitsu, Gao Yanlin, Okada Susumu, Yanagi Kazuhiro
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan.
Department of Physics, Comilla University, Cumilla, 3506, Bangladesh.
Sci Rep. 2023 Oct 8;13(1):16959. doi: 10.1038/s41598-023-44072-z.
Tungsten disulfide (WS) nanotubes exhibit various unique properties depending on their structures, such as their diameter and wall number. The development of techniques to prepare WS nanotubes with the desired structure is crucial for understanding their basic properties. Notably, the synthesis and characterization of multi-walled WS nanotubes with small diameters are challenging. This study reports the synthesis and characterization of small-diameter WS nanotubes with an average inner diameter of 6 nm. The optical absorption and photoluminescence (PL) spectra of the as-prepared nanotubes indicate that a decrease in the nanotube diameter induces a red-shift in the PL, suggesting that the band gap narrowed due to a curvature effect, as suggested by theoretical calculations.
二硫化钨（WS）纳米管根据其结构展现出各种独特的性质，比如它们的直径和管壁层数。开发制备具有所需结构的WS纳米管的技术对于理解其基本性质至关重要。值得注意的是，合成和表征小直径的多壁WS纳米管具有挑战性。本研究报告了平均内径为6纳米的小直径WS纳米管的合成与表征。所制备纳米管的光吸收和光致发光（PL）光谱表明，纳米管直径的减小会导致PL发生红移，这表明如理论计算所表明的，由于曲率效应带隙变窄。
