Hydrogen peroxide sensor based on Ag nanoparticles/zinc oxide modified electrode

Chia-Yu Lin 1Yi-Hsuan Lai 1,2Arumugam Balamurugan 1Chii-Wann Lin 2Kuo-Chuan Ho 1,3

1. Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan
2. Institute of Biomedical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan
3. Institute of Polymer Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan


Due to its wide applications, the determination of H2O2 concentration became an important research topic in recent years. Electrochemical sensors based on nanomaterials have been applied to the detection of H2O2 [1]. Among various nanomaterials, silver nanoparticles (AgNPs) with controllable dimension and size distribution attracted much attention because of their excellent catalytic [2] and electric properties [3]. Recently, photochemical reduction of Ag ions, induced by semiconductor materials, is of great interest since the silver loading and overall surface area can be easily controlled by tuning the conditions of the photochemical reaction and the surface morphology of semiconductor template, respectively.

In this study, a AgNPs/zinc oxide modified electrode was fabricated and its electrocatalytic properties towards H2O2 were investigated. The zinc oxide nanorods (ZnONRs) were first grown onto the FTO glass, which is denoted as ZnONRs/FTO electrode, covered by a ZnO seed layer by using chemical bath method. Thereafter, the AgNPs were deposited onto the ZnONRs/FTO electrode by photo-reducing Ag+ ions with the aid of UV irradiation (λ=365 nm) for 5 min, donated as AgNPs/ZnONRs/FTO. Compared to the ZnONRs/FTO electrode, a well pronounced peak at -0.62 V (vs. Ag/AgCl/KCl sat'd.) resulting from the reduction of H2O2 was observed on the AgNPs/ZnONRs/FTO electrode. Besides, when AgNPs was deposited onto the mesoporous ZnO film (ZnOmeso) in the presence of eosin Y, the resulting AgNPs/ZnOmeso/FTO electrode showed higher catalytic current to H2O2 than that in the absence of eosin Y. This behavior can be attributed to the higher loading of AgNPs on the ZnOmeso film. In order to increase the loading of AgNPs, thus enhancing the sensor sensitivity, the effect of the eosin Y concentration and the conditions of the photochemical reaction were under investigation.

[1] S. Wu, H. Zhao, H. Ju, C. Shi, J. Zhao, Electrochem. Commun. 8 (2006) 1197.

[2] C. M. Welch, C. E. Banks, A. O. Simm, R. G. Compton, Anal. Bioanal. Chem. 382 (2005) 12.

[3] A. Balamurugan, S. M. Chen, Electroanalysis 21 (2009) 1419.


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Presentation: Short communication at SMCBS'2009 International Workshop, by Chia-Yu Lin
See On-line Journal of SMCBS'2009 International Workshop

Submitted: 2009-08-31 17:09
Revised:   2009-09-09 12:17