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Title: | Molecular layer-by-layer re-stacking of MoS₂–In₂Se₃ by electrostatic means : assembly of a new layered photocatalyst | Authors: | Ng, BKY Wong, CCY Niu, W Garcia, HP Li, Y Ho, PL Kuo, WCH Taylor, RA Taniya, K Wei, Q Li, M Stamatakis, M Tsang, SCE |
Issue Date: | 7-Mar-2023 | Source: | Materials chemistry frontiers, 7 Mar. 2023, v. 7, no. 5, p. 937-945 | Abstract: | 2D-layered transition metal chalcogenides are useful semiconductors for a wide range of opto-electronic applications. Their similarity as layered structures offers exciting possibility to modify their electronic properties by creating new heterojunction assemblies from layer-by-layer restacking of individual monolayer sheets, however, the lack of specific interaction between these layers could induce phase segregation. Here, we employed a chemical method using n-BuLi to exfoliate MoS2 and In2Se3 into their monolayer-containing colloids in solution. The bulky Se atoms can be selectively leached from In2Se3 during Li treatment which gives positively charged surface monolayers in neutral pH whereas the strong polarization of Mo–S with moderate S leaching gives a negatively charged surface. Specific interlayer electrostatic attraction during their selective assembly gives a controllable atomic AB-type of layer stacking as supported by EXAFS, STEM with super-EDX mapping, TAS/TRPL and DFT calculations. Using this simple but inexpensive bottom-up solution method, a new photocatalyst assembled from layers for photo water splitting can be tailor-made with high activity. | Publisher: | Royal Society of Chemistry | Journal: | Materials chemistry frontiers | EISSN: | 2052-1537 | DOI: | 10.1039/d2qm01095j | Rights: | This journal is © The Royal Society of Chemistry and the Chinese Chemical Society 2023 This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/). The following publication Ng, B. K. Y., Wong, C. C. Y., Niu, W., Garcia, H. P., Li, Y., Ho, P.-L., Kuo, W. C. H., Taylor, R. A., Taniya, K., Wei, Q., Li, M., Stamatakis, M., & Tsang, S. C. E. (2023). Molecular layer-by-layer re-stacking of MoS2–In2Se3 by electrostatic means: assembly of a new layered photocatalyst [10.1039/D2QM01095J]. Materials Chemistry Frontiers, 7(5), 937-945 is available at https://doi.org/10.1039/D2QM01095J. |
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