Bismuth Oxychalcogenide Nanosheet: Facile Synthesis, Characterization, and Photodetector Application

Abstract

New 2D bismuth oxychalcogenide nanosheets have excellent theoretical properties such as high electronic mobility and excellent oxidation resistance, which have good application prospective for optoelectronic devices. In this paper, during the synthesis process via mild hydrothermal route, ammonium bismuth citrate (C6H13BiN2O7·H2O) is selected as Bi source. Both Bi2O2S and Bi2O2Se nanosheets (lateral size: over 2.0 µm, thickness: ≈ 5.0 nm) are synthesized successfully using thiourea (CH4N2S) as S source, and sodium selenite (Na2O3Se) as Se source, respectively. The as‐synthesized Bi2O2S and Bi2O2Se materials have desirable nanosheet‐like morphologies. After adding C6H13BiN2O7·H2O, [(NH3)2C6H7O7]3‐ can intercalate between the interlayers of Bi2O2S or Bi2O2Se, limiting the growth along c‐axis direction, so that 2D sheets can be obtained. Finally, the photodetectors are fabricated based on Bi2O2S and Bi2O2Se films coated by thermal spraying. The experimental results show that the maximum responsivity and detectivity of Bi2O2S‐based photodetector are 0.059 A W‐1 and 6.77 × 109 Jones, respectively. As to Bi2O2Se‐based photodetector, the maximum responsivity and detectivity can reach 75.14 A W‐1 and 3.95 × 1012 Jones, respectively. The mild hydrothermal synthesis using ammonium bismuth citrate as Bi source is a universal and facile method to obtain Bi2O2S and Bi2O2Se nanosheets for optoelectronic applications.

Computational Discovery of Stable Heteroanionic Oxychalcogenides ABXO (A, B = Metals; X = S, Se, and Te) and Their Potential Applications

“…However, many oxychalcogenide compounds are actually prepared by classical solid-state reactions . A number of other approaches also have been used to synthesize oxychalcogenide compounds, such as soft-chemistry, solvothermal synthesis, ,, thin-film growth, high-pressure synthesis, ion exchange, and topotactic reductive transformation . Different approaches have to be chosen according to the properties of the precursors.…”

Progress Report on Property, Preparation, and Application of Bi2O2Se

“…The CMS condition in the hydrothermal method is unfavorable for BiONO 3 , [ 52 ] so the transformation process will be accelerated. Liu et al [ 54 ] recently reported the hydrothermal synthesis of Bi 2 O 2 Se nanosheets using ammonium bismuth citrate as the Bi source, and the organic ions can promote the formation of thinner nanosheet. These wet‐chemical synthetic procedures are simple and easy to scale up, but the agglomeration and nonuniformity are usually accompanied.…”

Emerging two‐dimensional bismuth oxychalcogenides for electronics and optoelectronics

“…85 Analogously, Ghosh et al 3À will bind Bi 3+ on the Bi-rich (001) plane, which limits the diffusion between layers along c-axis direction, and facilitates the growth along lateral direction, resulting in the formation of thinner and larger nanosheets. 86 Although hydrothermal synthesis has the advantages of low cost and high yield, the control over lateral size and thickness of 2D Bi 2 O 2 X is still unsatisfactory. This issue may be solved by referring to the experience of successfully preparing large-size ultrathin Te flakes via hydrothermal synthesis, that is, controlling the specific growth direction of the precursor.…”

“…Currently, many 2). 76,83,85,86,97,[126][127][128][129][130][131][132][133][134][135][136][137] Yan and coworkers fabricated near-infrared photodetectors based on 2D Bi 2 O 2 S flakes prepared by hydrothermal synthesis (Figure 11(A)). 85 The photodetector exhibited pronounced photoresponse under 785 nm light illumination with various power densities from 0.05 to 500 mW cm À2 (Figure 11(B)).…”