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Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth

by 1,2,3 and 1,2,4,*
1
Program in Biomedical Science and Engineering, Inha University, Incheon 22212, Korea
2
Program in Smart Digital Engineering, Inha University, Incheon 22212, Korea
3
Materials Center for Energy Convergence, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-gu, Changwon 51508, Korea
4
Department of Chemical Engineering, Inha University, Incheon 22212, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Aivaras Kareiva
Materials 2021, 14(23), 7294; https://doi.org/10.3390/ma14237294
Received: 27 October 2021 / Revised: 23 November 2021 / Accepted: 26 November 2021 / Published: 29 November 2021
The ability to control the active edge sites of transition metal dichalcogenides (TMDs) is crucial for modulating their chemical activity for various electrochemical applications, including hydrogen evolution reactions. In this study, we demonstrate a colloidal synthetic method to prepare core-shell-like heterostructures composed of MoSe2 and WSe2 via a two-step sequential growth. By overgrowing WSe2 on the surface of preexisting MoSe2 nanosheet edges, MoSe2-core/WSe2-shell heterostructures were successfully obtained. Systematic comparisons of the secondary growth time and sequential order of growth suggest that the low synthetic temperature conditions allow the stable overgrowth of shells rich in WSe2 on top of the core of MoSe2 with low Gibbs formation energy. The electrochemical analysis confirms that the catalytic activity correlates to the core-shell composition variation. Our results propose a new strategy to control the edge site activity of TMD materials prepared by colloidal synthesis, which is applicable to diverse electrochemical applications. View Full-Text
Keywords: transition metal dichalcogenides; MoSe2; WSe2; heterostructure; core-shell; colloidal synthesis transition metal dichalcogenides; MoSe2; WSe2; heterostructure; core-shell; colloidal synthesis
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MDPI and ACS Style

Hwang, Y.; Shin, N. Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth. Materials 2021, 14, 7294. https://doi.org/10.3390/ma14237294

AMA Style

Hwang Y, Shin N. Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth. Materials. 2021; 14(23):7294. https://doi.org/10.3390/ma14237294

Chicago/Turabian Style

Hwang, Yunjeong, and Naechul Shin. 2021. "Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth" Materials 14, no. 23: 7294. https://doi.org/10.3390/ma14237294

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