The properties of ZnO nanorods modified by Au nanoparticles for galactose biosensor application

La Phan Phuong Ha * , Tran Quang Trung , Ho Dinh Huy and Lam Nu Mong Tra

* Corresponding author (lppha@hcmus.edu.vn)

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Received: 29 Sep 2017
Revised: 27 Feb 2018
Accepted: 20 Jul 2018
Published: 31 Jul 2018
DOI: 10.22144/ctu.jen.2018.029
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La, P. P. H., Tran, Q. T., Ho, D. H., & Lam, N. M. T. (2018). The properties of ZnO nanorods modified by Au nanoparticles for galactose biosensor application. CTU Journal of Innovation and Sustainable Development , 54(09), 81-87. https://doi.org/10.22144/ctu.jen.2018.029
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No. 09 (2018)

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Abstract

Galactose biosensor based on ZnO nanorods were fabricated and modified through the addition of Au nanoparticles. The sol-gel method was utilized to grow ZnO nanorods on indium tin oxide-coated glass substrates (FTO) and the the Au nanoparticles were modified on ZnO nanorods by hydrothermal method. Well aligned hexagonal structured ZnO nanorods with a diameter from 40 to 60 nm were obtained. The Au nanoparticles (Au NPs) were spheres and they had diameter from 6 to 8 nm. After these Au NPs were attached to ZnO nanorods electrode, galactose oxidase enzyme (GOx) was immobilized on this electrode in 3.5 hours to form the working electrode in galactose biosensor (GOx|Au-ZnO|FTO). The cyclic voltammetry method (CV) was used to test the activity of the working electrode in galactose solution 200 mM concentration. The CV result showed that the current intensity of the GOx|ZnO|FTO electrode in galactose solution is about 0.085 µA/mm2. On the other hand, with the  GOx|Au-ZnO|FTO electrode, this value increases to 0.2 µA/mm2.
Keywords: Au nanoparticle, cyclic voltammetry method, galactose biosensor, ZnO nanorod

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