Jump to main content
Jump to site search

Issue 6, 2018
Previous Article Next Article

Generating plasmonic heterostructures by cation exchange and redox reactions of covellite CuS nanocrystals with Au3+ ions

Author affiliations

Abstract

We demonstrate the fabrication of various types of heterostructures, including core–shells and dimers. This is achieved by reacting platelet-shaped covellite (CuS) nanocrystals (NCs) with Au3+ ions under various reaction conditions: the exposure of CuS NCs to Au3+ ions, in the presence or in the absence of ascorbic acid (AA), leads to the formation of CuS@Au core–shell nanostructures; the reaction of CuS NCs with Au3+ ions in the presence of oleylamine (OM) leads to the formation of CuS@Au2S; the presence of both OM and AA leads to the formation of Au/CuS dimers. Depending on which condition is chosen, either cation exchange (CE) between gold and copper ions is predominant (leading to amorphous Au2S) or the reduction of Au3+ leads to the nucleation of metallic Au domains (which are operated by the AA). In the heterostructures achieved by CE, the Au2S shell is almost entirely amorphous, and can be converted to polycrystalline upon electron beam irradiation. Finally, when both oleylamine and AA are present in the reaction environment, Au/CuS dimers are formed due to the reduction of Au3+ to metallic Au domains which nucleate on top of the CuS seeds. The experimental dual plasmonic bands of the CuS@Au core–shells and Au/CuS dimers are in agreement with the theoretical optical simulations. The procedures described here enable the synthesis of core–shell nanostructures with tunable localized surface plasmon resonances (LSPRs) in the near-infrared (NIR) region, and of plasmonic metal/semiconductor heterostructures with LSPRs in both the NIR and the visible regions.

Graphical abstract: Generating plasmonic heterostructures by cation exchange and redox reactions of covellite CuS nanocrystals with Au3+ ions

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Sep 2017, accepted on 28 Dec 2017 and first published on 28 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07283J
Citation: Nanoscale, 2018,10, 2781-2789
  •   Request permissions

    Generating plasmonic heterostructures by cation exchange and redox reactions of covellite CuS nanocrystals with Au3+ ions

    C. Hu, W. Chen, Y. Xie, S. K. Verma, P. Destro, G. Zhan, X. Chen, X. Zhao, P. J. Schuck, I. Kriegel and L. Manna, Nanoscale, 2018, 10, 2781
    DOI: 10.1039/C7NR07283J

Search articles by author

Spotlight

Advertisements