Site-specific Ag coating on concave Au nanoarrows by controlling the surfactant concentration

Dashen Dong, Qianqian Shi, Debabrata Sikdar, Yunmeng Zhao, Yiyi Liu, Runfang Fu, Malin Premaratne, Wenlong Cheng

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The ability to control the site-selective deposition of a noble metal with nanoscale accuracy is vital for the synthesis of well-defined heterogeneous core-shell bimetallic nanoparticles for various applications ranging from nanophotonics to catalysis. Here, precise site-specific Ag coating onto concave gold nanoarrows (GNAs) is reported by tuning the concentration of the surfactant-cetyltrimethylammonium chloride (CTAC). Three distinct nanocoating structures, namely, anisotropic coating, middle coating, and conformal coating are obtained, which are achieved under low, medium and high CTAC concentrations, respectively. The site-specific nanoscale coating on GNAs is proved by scanning transmission electron microscopy imaging in conjunction with the elemental mapping. The CTAC concentration-dependent, facet-specific passivation may be the cause for the three distinct nanoparticles obtained. The morphology differences resulted in discrete plasmonic features, and a linear relationship between the resonance peak and the CTAC concentration is found for the conformal-coated GNAs. We further fabricate free-standing monolayer nanosheets out of the three kinds of nanoparticles, which display strong shape-dependent SERS enhancements.

Original languageEnglish
Pages (from-to)940-946
Number of pages7
JournalNanoscale Horizons
Volume4
Issue number4
DOIs
Publication statusPublished - 1 Jul 2019

Cite this

Dong, Dashen ; Shi, Qianqian ; Sikdar, Debabrata ; Zhao, Yunmeng ; Liu, Yiyi ; Fu, Runfang ; Premaratne, Malin ; Cheng, Wenlong. / Site-specific Ag coating on concave Au nanoarrows by controlling the surfactant concentration. In: Nanoscale Horizons. 2019 ; Vol. 4, No. 4. pp. 940-946.
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Site-specific Ag coating on concave Au nanoarrows by controlling the surfactant concentration. / Dong, Dashen; Shi, Qianqian; Sikdar, Debabrata; Zhao, Yunmeng; Liu, Yiyi; Fu, Runfang; Premaratne, Malin; Cheng, Wenlong.

In: Nanoscale Horizons, Vol. 4, No. 4, 01.07.2019, p. 940-946.

Research output: Contribution to journalArticleResearchpeer-review

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