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Hydrothermal synthesis of gold nanoplates and their structure-dependent LSPR properties

Published online by Cambridge University Press:  13 August 2018

Yanting Liu
Affiliation:
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong SAR 999077, China
Lijun Yang
Affiliation:
Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Yajing Shen*
Affiliation:
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong SAR 999077, China; City University of Hong Kong Shenzhen Research Institute, Shen Zhen 518057, People’s Republic of China; and Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: yajishen@cityu.edu
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Abstract

We developed a facile hydrothermal method to synthesize gold nanoplates with the assistance of surfactant cetyltrimethylammonium chloride (CTAC). Gold nanostructure shapes from triangular, truncated triangular to hexagonal morphology with different sizes can be obtained by accommodating the molar ratios of the surfactant to the gold precursor ([CTAC]/[HAuCl4]). The edge width of gold nanoplates could also be adjusted from tens to hundreds of nanometers, and even several microns. The growth mechanism analysis reveals that the surfactant CTAC directs and promotes the growth of the tabular {111} facets to form nanoplate structures with the size and shape variations. The structure-dependent localized surface plasmon resonance of different gold nanoplates was theoretically and experimentally explained by finite element method simulation and surface-enhanced Raman scattering (SERS) enhancement, respectively. Based on the Raman spectrum analysis of the marker molecule 4-mercaptobenzoic acid (4-MBA) labeled with different gold nanoplates, it demonstrates that the enhanced SERS performance relies on the different plasmonic properties of the gold nanoplates. Therefore, the gold nanoplates may have potential applications in SERS-based sensing and imaging field.

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Copyright
Copyright © Materials Research Society 2018 

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