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Sensors 2014, 14(12), 24472-24482; doi:10.3390/s141224472

An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples

1
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100190, China
This paper is an extended version of the paper entitled “Electrochemical Microsensor Based on Gold Microband Array Electrode for Phosphate Determination in Freshwater”, presented at CSMN 2014, Chengdu, China, 31 August 2014.
*
Author to whom correspondence should be addressed.
Received: 29 October 2014 / Revised: 2 December 2014 / Accepted: 5 December 2014 / Published: 19 December 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

This work describes the fabrication, characterization, and application of a gold microband array electrode (MAE) for the determination of phosphate in fresh water samples. The working principle of this MAE is based on the reduction of a molybdophosphate complex using the linear sweep voltammetric (LSV) method. The calibration of this microsensor was performed with standard phosphate solutions prepared with KH2PO4 and pH adjusted to 1.0. The microsensor consists of a platinum counter electrode, a gold MAE as working electrode, and an Ag/AgCl electrode as reference electrode. The microelectrode chips were fabricated by the Micro Electro-Mechanical System (MEMS) technique. To improve the sensitivity, gold nanoparticles (AuNPs) were electrodeposited on the working electrode. With a linear range from 0.02 to 0.50 mg P/L, the sensitivity of the unmodified microsensor is 2.40 µA per (mg P/L) (R2 = 0.99) and that of the AuNPs-modified microsensor is 7.66 µA per (mg P/L) (R2 = 0.99). The experimental results showed that AuNPs-modified microelectrode had better sensitivity and a larger current response than the unmodified microelectrode. View Full-Text
Keywords: electrochemical; microband array electrode; gold nanoparticles; phosphate; fresh water samples electrochemical; microband array electrode; gold nanoparticles; phosphate; fresh water samples
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, F.; Tong, J.; Li, Y.; Bian, C.; Sun, J.; Xia, S. An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples. Sensors 2014, 14, 24472-24482.

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