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Crystalline boron monosulfide nanosheets with tunable bandgaps
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2021-10-15 , DOI: 10.1039/d1ta03307g
Haruki Kusaka 1 , Ryota Ishibiki 1 , Masayuki Toyoda 2 , Takeshi Fujita 3 , Tomoharu Tokunaga 4 , Akiyasu Yamamoto 5, 6 , Masashi Miyakawa 7 , Kyosuke Matsushita 8 , Keisuke Miyazaki 9 , Linghui Li 1 , Satish Laxman Shinde 10 , Mariana S. L. Lima 1 , Takeaki Sakurai 11, 12 , Eiji Nishibori 12, 13 , Takuya Masuda 8 , Koji Horiba 14 , Kenji Watanabe 7 , Susumu Saito 2, 6, 15 , Masahiro Miyauchi 9 , Takashi Taniguchi 16 , Hideo Hosono 6, 16 , Takahiro Kondo 6, 10, 12
Affiliation  

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.

中文翻译:

具有可调带隙的结晶单硫化硼纳米片

二维 (2D) 一硫化硼 (BS) 纳米片预计具有多个稳定相和独特的电子结构,赋予它们有趣的属性,包括超导、热电和储氢特性。在本文中,我们报告了通过菱形一硫化硼 (r-BS) 的物理剥离实现 2D BS 纳米片的实验。此外,我们证明了 2D BS 纳米片和 r-BS 粉末在乙腈中的混合物的轻松分离;前者作为上清液中的分散体被选择性分离,而后者保留在沉淀物中。此外,密度泛函理论计算揭示了带隙能量(E g)对堆叠 BS 纳米片层数的明显依赖性,其中BS 纳米片的E g比 r-BS 高约 1.0 eV。原子力显微镜、阴极发光、紫外-可见吸收光谱和激发发射矩阵实验表明,BS 纳米片和 r-BS 之间的带隙差约为 1.0 eV。我们还展示了基于使用光电化学电流切换的 r-BS 和 BS 纳米片之间带隙差异所产生的特性的应用。这些结果表明,通过控制堆叠的 2D BS 纳米片的数量,可以将纳米片带隙调整到所需的值。因此,BS 纳米片是有前途的非金属二维材料,可用于需要带隙控制的应用,如电子和光催化。
更新日期:2021-10-27
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