Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid

Xiaodong Cao; Xueting Zhu; Shudong He; Xuan Xu; Yongkang Ye; Sundaram Gunasekaran

doi:10.1039/C9NR01309A

Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid†

Xiaodong Cao,

^a Xueting Zhu,^a Shudong He,

^a Xuan Xu,

^b Yongkang Ye

*^a and Sundaram Gunasekaran

*^c

Author affiliations

* Corresponding authors

^a School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China
E-mail: yongkang.ye@hfut.edu.cn

^b School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China

^c Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
E-mail: guna@wisc.edu

Abstract

Three-dimensional (3D) networked nanomaterials have attracted great interest because of their unique porous and 3D-networked structures. In this work, a series of gold nanoparticle (AuNP) doped graphene hydrogel nanocomposites (AuNP-GHs) were synthesized through hydrothermal reaction under various conditions. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the AuNP-GH. The AuNP-GH was used to modify the glassy carbon electrode (GCE) for the detection of indole-3-acetic acid (IAA) and salicylic acid (SA) using chronoamperometric measurements. Under optimum conditions, the AuNP-GH/GCE exhibited linear response to IAA in the ranges of 0.8–4 μM and 4–128 μM, and to SA in the ranges of 0.8–8.4 μM and 8.4–188.4 μM. The detection limits (S/N = 3) were calculated to be 0.21 μM for IAA and 0.22 μM for SA. The proposed sensor showed good sensitivity and stability and hence it was applied in the detection of IAA and SA in spiked samples with satisfactory results.

This article is part of the themed collection: Nanocarbons

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Article information

DOI: https://doi.org/10.1039/C9NR01309A
Article type: Paper
Submitted: 12 Feb 2019
Accepted: 28 Apr 2019
First published: 29 Apr 2019

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Nanoscale, 2019,11, 10247-10256

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Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid

X. Cao, X. Zhu, S. He, X. Xu, Y. Ye and S. Gunasekaran, Nanoscale, 2019, 11, 10247 DOI: 10.1039/C9NR01309A

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Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid†

Abstract

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Gold nanoparticle-doped three-dimensional reduced graphene hydrogel modified electrodes for amperometric determination of indole-3-acetic acid and salicylic acid

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