New rule and growth model for the synthesis method of gold nanorods with binary surfactant CTAB and NaOL

Ming-Zhang Wei; Tian-Song Deng; Qi Zhang; Xi Chen; Zhiqun Cheng; Shiqi Li; Yi-Jie Gu

doi:10.1063/5.0100475

AIP Advances (Aug 2022)

New rule and growth model for the synthesis method of gold nanorods with binary surfactant CTAB and NaOL

Ming-Zhang Wei,
Tian-Song Deng,
Qi Zhang,
Xi Chen,
Zhiqun Cheng,
Shiqi Li,
Yi-Jie Gu

Affiliations

Ming-Zhang Wei: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Tian-Song Deng: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Qi Zhang: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Xi Chen: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Zhiqun Cheng: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Shiqi Li: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China
Yi-Jie Gu: College of Electronics and Information Engineering, Hangzhou Dianzi University, No. 1158, 2nd Avenue, Baiyang Street, Hangzhou 310018, China

DOI: https://doi.org/10.1063/5.0100475
Journal volume & issue: Vol. 12, no. 8
pp. 085019 – 085019-7

Abstract

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The roles of CTAB and Ag+ have been discovered and given us a deeper understanding of the seed-mediated method in the gold nanorods synthesis. Former work used binary surfactants CTAB + NaOL (sodium oleate) to greatly improve the dimensional tunability and monodispersity of gold nanorods. However, they only used a few of the concentration combinations of the binary surfactants, and the influence of NaOL under this method has not been systematically studied. In this work, we carried out systematic experiments under the variation of NaOL and used transmission electron microscopy and UV–vis-near-infrared spectroscopy to monitor the growth process of the gold nanorods. The results showed that the NaOL contributed to the symmetry breaking process. We discovered the ideal ranges of NaOL concentration under different concentrations of CTAB (10–40 mM). Lower concentrations of NaOL produced many impurities, such as Au spheres, while higher concentrations of NaOL led to the decrease of monodispersity of the obtained gold nanorods. A growth model based on the balance of diffusion/reduction of the growth solution has been proposed in order to explain the formation of the gold nanorods.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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