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An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†)
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 (L...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4299121/ https://www.ncbi.nlm.nih.gov/pubmed/25536001 http://dx.doi.org/10.3390/s141224472 |
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author | Wang, Fangfang Tong, Jianhua Li, Yang Bian, Chao Sun, Jizhou Xia, Shanhong |
author_facet | Wang, Fangfang Tong, Jianhua Li, Yang Bian, Chao Sun, Jizhou Xia, Shanhong |
author_sort | Wang, Fangfang |
collection | PubMed |
description | 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 KH(2)PO(4) 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) (R(2) = 0.99) and that of the AuNPs-modified microsensor is 7.66 μA per (mg P/L) (R(2) = 0.99). The experimental results showed that AuNPs-modified microelectrode had better sensitivity and a larger current response than the unmodified microelectrode. |
format | Online Article Text |
id | pubmed-4299121 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-42991212015-01-26 An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) Wang, Fangfang Tong, Jianhua Li, Yang Bian, Chao Sun, Jizhou Xia, Shanhong Sensors (Basel) Article 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 KH(2)PO(4) 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) (R(2) = 0.99) and that of the AuNPs-modified microsensor is 7.66 μA per (mg P/L) (R(2) = 0.99). The experimental results showed that AuNPs-modified microelectrode had better sensitivity and a larger current response than the unmodified microelectrode. MDPI 2014-12-19 /pmc/articles/PMC4299121/ /pubmed/25536001 http://dx.doi.org/10.3390/s141224472 Text en © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Fangfang Tong, Jianhua Li, Yang Bian, Chao Sun, Jizhou Xia, Shanhong An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title | An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title_full | An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title_fullStr | An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title_full_unstemmed | An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title_short | An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples (†) |
title_sort | electrochemical microsensor based on a aunps-modified microband array electrode for phosphate determination in fresh water samples (†) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4299121/ https://www.ncbi.nlm.nih.gov/pubmed/25536001 http://dx.doi.org/10.3390/s141224472 |
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