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Mechanism and modeling of poly[vinylpyrrolidone] (PVP) facilitated synthesis of silver nanoplates

Abstract

Silver triangular nanoplates (AgTNP) present unique surface plasmonic and catalytic properties depending upon the thickness and edge length. AgTNP are synthesized in a kinetically controlled growth process, by and large, using the polymer poly-vinylpyrrolidone (PVP) as a reductant. In this work, we present a systematic study to uncover the role of molecular weight of PVP (MW) and PVP to silver salt (AgNO3) molar ratio ([P:S]) on the physical dimensions of AgTNP. The edge length of AgTNP shows a non-monotonic variation with respect to [P:S] for all MW. Based on several control experiments, a kinetic mechanism is proposed and a mathematical model is developed to explain the formation of AgTNP. The elementary processes of the model include the reduction of Ag+ by -OH group in PVP, followed by instantaneous nucleation. This phase is then followed by a slow reduction of Ag+ and growth of the nuclei to AgTNP. The model shows a reasonable agreement with experiments on the non-monotonic variation of edge length of AgTNP with respect to [P:S], as well as on the temporal evolution of edge length.

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Publication details

The article was received on 12 Mar 2018, accepted on 16 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8CP01610K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Mechanism and modeling of poly[vinylpyrrolidone] (PVP) facilitated synthesis of silver nanoplates

    N. Thomas and E. Mani, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01610K

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