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Journal of Nanoparticle Research

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01-09-2018 | Research Paper

Selective oxidative etching of CTAC-stabilized multi-branched gold nanoparticles: application in spectral sensing of iodide ions

Authors: Guojun Weng, Xiaojing Dong, Jing Zhao, Jianjun Li, Jian Zhu, Junwu Zhao

Published in: Journal of Nanoparticle Research | Issue 9/2018

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Abstract

Multi-branched gold nanoparticles (Mb Au NPs) with sharp tips are considered excellent candidates for broad applications in plasmonics, optical sensing, and field enhancement. Here, Mb Au NPs were prepared by a one-step seedless synthesis method in the presence of Triton X-100. CTAB and CTAC were used to replace TX-100 for improving the stability of Mb Au NPs. The effect of halide ions (Cl, Br, I) on oxidative etching of CTAB- and CTAC-stabilized Mb Au NPs were investigated. The results showed that both Br⁻ and I⁻ could trigger the etching of CTAB-stabilized Mb Au NPs. However, only I⁻ triggered the etching of CTAC-stabilized Mb Au NPs even without catalysis of Cu²⁺. The selectivity of I⁻ to the etching of CTAC-stabilized Mb Au NPs led to the decrease of plasmon intensity. Based on such a unique property, we demonstrated a spectral detection method for I⁻ using the CTAC-stabilized Mb Au NPs as nanoprobes. The intensity decrease of a plasmon peak had a linear correlation with the concentration of I⁻ in the range of 1.8–18 μM, with a detection limit of 0.41 μM. The proposed method also showed a high selectivity towards I⁻ over other existing anions. Therefore, this spectral method offers the possibility to rapidly distinguish I⁻ in analytical contexts in which halide ions coexist.

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Title: Selective oxidative etching of CTAC-stabilized multi-branched gold nanoparticles: application in spectral sensing of iodide ions
Authors: Guojun Weng
Xiaojing Dong
Jing Zhao
Jianjun Li
Jian Zhu
Junwu Zhao
Publication date: 01-09-2018
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 9/2018
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-018-4360-x

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