Label-Free Electrochemical Detection of Vanillin through Low-Defect Graphene Electrodes Modified with Au Nanoparticles

Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China

College of Material Science and Optoelectronic Technology, University of Chinese Academy of Sciences, 19 A Yuquan Rd., Shijingshan District, Beijing 100049, China

Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, University of Nottingham, Ningbo 315100, China

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Department of Physics, Liaoning University, Shenyang 110000, China

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Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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Department of Chemistry, Hubei Normal University, Huangshi 435002, China

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Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; [email protected]

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College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

Authors to whom correspondence should be addressed.

^†

These authors contribute equally.

Materials 2018, 11(4), 489; https://doi.org/10.3390/ma11040489

Received: 26 February 2018 / Revised: 16 March 2018 / Accepted: 20 March 2018 / Published: 25 March 2018

(This article belongs to the Special Issue Recent Advances in 2D Nanomaterials)

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Abstract

Graphene is an excellent modifier for the surface modification of electrochemical electrodes due to its exceptional physical properties and, for the development of graphene-based chemical and biosensors, is usually coated on glassy carbon electrodes (GCEs) via drop casting. However, the ease of aggregation and high defect content of reduced graphene oxides degrade the electrical properties. Here, we fabricated low-defect graphene electrodes by catalytically thermal treatment of HPHT diamond substrate, followed by the electrodeposition of Au nanoparticles (AuNPs) with an average size of ≈60 nm on the electrode surface using cyclic voltammetry. The Au nanoparticle-decorated graphene electrodes show a wide linear response range to vanillin from 0.2 to 40 µM with a low limit of detection of 10 nM. This work demonstrates the potential applications of graphene-based hybrid electrodes for highly sensitive chemical detection. View Full-Text

Keywords: low-defect graphene; sp³-to-sp² conversion; gold nanoparticles modification; vanillin; electrochemical detection

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MDPI and ACS Style

Gao, J.; Yuan, Q.; Ye, C.; Guo, P.; Du, S.; Lai, G.; Yu, A.; Jiang, N.; Fu, L.; Lin, C.-T.; Chee, K.W.A. Label-Free Electrochemical Detection of Vanillin through Low-Defect Graphene Electrodes Modified with Au Nanoparticles. Materials 2018, 11, 489. https://doi.org/10.3390/ma11040489

AMA Style

Gao J, Yuan Q, Ye C, Guo P, Du S, Lai G, Yu A, Jiang N, Fu L, Lin C-T, Chee KWA. Label-Free Electrochemical Detection of Vanillin through Low-Defect Graphene Electrodes Modified with Au Nanoparticles. Materials. 2018; 11(4):489. https://doi.org/10.3390/ma11040489

Chicago/Turabian Style

Gao, Jingyao, Qilong Yuan, Chen Ye, Pei Guo, Shiyu Du, Guosong Lai, Aimin Yu, Nan Jiang, Li Fu, Cheng-Te Lin, and Kuan W.A. Chee. 2018. "Label-Free Electrochemical Detection of Vanillin through Low-Defect Graphene Electrodes Modified with Au Nanoparticles" Materials 11, no. 4: 489. https://doi.org/10.3390/ma11040489

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Label-Free Electrochemical Detection of Vanillin through Low-Defect Graphene Electrodes Modified with Au Nanoparticles

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