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Hierarchical growth and morphological control of ordered Cu–Au alloy arrays with high surface enhanced Raman scattering activity

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Abstract

Low-cost Cu–Au alloy hierarchical structures are fabricated by coelectrodeposition, and the highest SERS activity is obtained when the atom ratio of Cu and Au is about 88 : 12. The effect of morphology of Cu–Au alloys on the SERS performance is investigated, and the corresponding SERS spectra and FDTD results show that multi-branched Cu–Au dendrites exhibit the highest SERS activity for the massive Raman “hot spots”, especially when the dendrites are self-assembled on highly ordered Si pillar substrates. Using the multi-branched Cu–Au alloy arrays, Rhodamine 6G (R6G) with a trace concentration as low as 10−14 M can be detected, and the enhancement factor (EF) is estimated to be about 6 × 1010.

Graphical abstract: Hierarchical growth and morphological control of ordered Cu–Au alloy arrays with high surface enhanced Raman scattering activity

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Publication details

The article was received on 11 Sep 2019, accepted on 07 Nov 2019 and first published on 10 Nov 2019


Article type: Paper
DOI: 10.1039/C9CE01434A
CrystEngComm, 2020, Advance Article

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    Hierarchical growth and morphological control of ordered Cu–Au alloy arrays with high surface enhanced Raman scattering activity

    Z. Wang, R. Liu, Z. Feng, L. Lin, R. Xie, J. Li, H. Liu, F. Huang and Z. Zheng, CrystEngComm, 2020, Advance Article , DOI: 10.1039/C9CE01434A

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