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Temperature Regulation Growth of Au Nanocrystals: from Concave Trisoctahedron to Dendritic Structures and Their Ultrasensitive SERS-based Detection of Lindane

Abstract

A facile temperature regulation strategy is developed for fabrication of the Au concave nanocrystals with specific shapes via seed-assisted growth at 25oC or lower. It has been found that the reaction temperature, even with minor changes, can significantly influence the shape of the nanocrystals, which evolves from the concave trisoctahedral to calyptriform, coral and dendritic structures with the decrease of temperature from 25oC to 5oC. The size and optical absorbance spectra of the nanocrystals can be determined just by the addition amount of Au seeds. The formation of the Au concave nanocrystals is attributed to the preferential growth of the nuclei in <110> and <111> directions, along which the growth rates are of different temperature dependences. Importantly, the concave trisoctahedral and calyptriform Au nanocrystals-built films have exhibited the strong surface enhanced Raman scattering (SERS) activity to the lindane molecules, with the enhancement factor higher than 107, due to their high density of sharp corners/edges or the tip effect. The Raman peak intensity versus the lindane concentration is subject to a linear double logarithmic relation from 30 ppb to 300 ppm, which is attributed to Freundlich adsorption of lindane molecules on the Au nanocrystals. This work provides not only a simple route for the fabrication of the Au nanocrystals with various specific structures but also the efficient SERS substrates for the trace detection of organochlorine pesticide residues.

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Publication details

The article was received on 21 Aug 2017, accepted on 13 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03808A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Temperature Regulation Growth of Au Nanocrystals: from Concave Trisoctahedron to Dendritic Structures and Their Ultrasensitive SERS-based Detection of Lindane

    X. Zhou, Q. Zhao, G. Liu, H. Zhang, Y. Li and W. Cai, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03808A

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