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Issue 38, 2013
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Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2

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Abstract

The effects of the addition of a small amount of HAuCl4·4H2O in the preparation of triangular Ag prisms from an aqueous AgNO3–NaBH4–polyvinylpyrrolidone (PVP)–trisodium citrate (Na3CA)–H2O2 solution were studied by monitoring time-dependent surface plasmon resonance (SPR) bands in the UV-vis region and by analyzing the data obtained from transmission electron microscopic (TEM) images and TEM-energy dispersed X-ray spectroscopy (EDS). The results show that Ag-rich AgAu alloy triangular prisms are formed by the addition of a small amount of AuCl4 ions. At first, small Au seeds were formed without latent time, along with spherical Ag-rich AgAu alloy particles. Then, a spherical-to-prism (STP) transformation of the AgAu alloy particles occurred. The plasmon band of the AgAu prism shifts slightly to red with the increasing concentration of HAuCl4·4H2O.

Graphical abstract: Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2

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Publication details

The article was received on 18 Jun 2013, accepted on 25 Jul 2013 and first published on 25 Jul 2013


Article type: Paper
DOI: 10.1039/C3CE41172A
Citation: CrystEngComm, 2013,15, 7688-7695

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    Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2

    M. Tsuji, A. Yajima, M. Hamasaki, M. Hattori, M. Mitarai and H. Kawazumi, CrystEngComm, 2013, 15, 7688
    DOI: 10.1039/C3CE41172A

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