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Homoepitaxial growth on semiconductor nanocrystals for efficient and stable visible-light photocatalytic hydrogen evolution

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Abstract

Recent advancements in colloidal chemistry offer unique opportunities to construct core/shell semiconductor nanocrystals (NCs) with tailored optical properties. Major efforts have been focused on synthesizing core/shell NCs via heteroepitaxial growth, which often leads to effective surface passivation and thus reduced trap states (TS). However, the growth of a shell with a wider band gap or energy band offset tends to form a physical barrier for the migration of photo-generated charge carriers to the surrounding environment, resulting in compromised photoactivity. Here, we show that the homoepitaxial growth of NCs is able to facilitate the passivation of TS without affecting the migration of charge carriers to the surface of NCs. Homostructured CdShomo NCs have demonstrated improved photocatalytic hydrogen production compared with the CdS core NCs and heterostructured CdS/ZnS core/shell NCs in terms of both efficiency and photostability. We envision that homoepitaxial growth would provide new opportunities to tailor semiconductor NCs for photocatalytic and photovoltaic applications.

Graphical abstract: Homoepitaxial growth on semiconductor nanocrystals for efficient and stable visible-light photocatalytic hydrogen evolution

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Publication details

The article was received on 17 Jul 2017, accepted on 02 Oct 2017 and first published on 17 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05206E
Citation: Nanoscale, 2017, Advance Article
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    Homoepitaxial growth on semiconductor nanocrystals for efficient and stable visible-light photocatalytic hydrogen evolution

    Z. Fang, J. Zhou, Y. Sun, J. Hu, L. Liang, R. Xu and H. Duan, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR05206E

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