Synthesis of bismuth selenide nanoplates by solvothermal methods and its stacking optical properties

Abstract

Bismuth selenide (Bi2Se3) is a novel topological insulator that is promising for broad optical absorption materials on the basis of its large bulk band and well-defined single Dirac cone. Herein, few-layer Bi2Se3 nanoplates of different sizes have been successfully synthesized via the solvothermal method. We present our discovery of optical properties on homojunction Bi2Se3 nanoplates with FTIR measurements. The interface of homojunction Bi2Se3 nanoplates demonstrates an interesting optical modulation in the near-infrared region in contrast to individual bulk Bi2Se3 and other reported 2D hetero-structure materials. It was validated that the unexpected behavior was attributed to the interface between variously stacked nanoplates and its unique zero-wave anti-reflection properties. Our experimental results provide evidence of the Bi2Se3 nanoplate possess high optical absorption in the near-infrared range, promising for photothermal and optical diagnostic therapy application.

2D Bi2Se3 materials for optoelectronics

“…Under suitable conditions, these reactants react with each other after reaching the chemical reaction activity, and finally produce the desired products. Importantly, the morphology, size, thickness, and crystallinity of the products can be precisely controlled by changing the reactant, solvent, reaction temperature and time ( Liu et al., 2019a , 2019b ; Zhuang et al., 2014 ). For example, Xiong et al.…”

“…Liu et al. demonstrated the near and mid-infrared optical absorption of 2D Bi 2 Se 3 crystal with various thicknesses from 5 to 25 nm ( Liu et al., 2019a , 2019b ). As displayed in Figure 4 C, the 2D Bi 2 Se 3 crystal exhibited obvious optical absorption in the near and mid-infrared region and the characteristic that the absorbance increases with thickness is similar to other 2D layered materials.…”

“…As displayed in Figure 4 C, the 2D Bi 2 Se 3 crystal exhibited obvious optical absorption in the near and mid-infrared region and the characteristic that the absorbance increases with thickness is similar to other 2D layered materials. This dependence can be explained by the quantum confinement effect ( Liu et al., 2019a , 2019b ). The wide spectral absorption of Bi 2 Se 3 make it a promising candidate material for constructing visible-infrared photodetectors ( Hong et al., 2020 ; Liu et al., 2020a , 2020b , 2020c ; Luo et al., 2021a , 2021b ; Zhang et al., 2010 ).…”

“… (C) Near and mid-infrared absorption spectra of 2D Bi 2 Se 3 flakes with different thicknesses. Reproduced with permission from ( Liu et al., 2019a , 2019b ). Copyright 2019 AIP Publishing.…”

“…Compared with their bulk counterparts, 2D layered materials usually show unique features because of quantum confinement effect along the vertical direction of the 2D plane ( Akinwande et al., 2014 ; Liu et al., 2020a , 2020b , 2020c ; Ricciardulli et al., 2021 ). Atomically smooth surfaces without dangling bonds enable them to be compatible with any 2D materials and mature complementary metal oxide semiconductor (CMOS) process without considering lattice matching ( Akinwande et al., 2019 ; Iannaccone et al., 2018 ; Liang et al., 2019 ; Liu et al., 2019a , 2019b ; Wang et al., 2021a , 2021b , 2021c , 2021d ). Moreover, the electronic band structures of 2D layered materials cover a wide range of electromagnetic spectrum, meaning that diverse optical and electrical properties reside in their family ( Liu et al., 2021a , 2021b ; Xia et al., 2014 ).…”