Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water
Herein, a simple and portable electrochemical sensor based on a reduced graphene oxide/gold nanoparticle/manganese dioxide (rGO/AuNP/MnO<sub>2</sub>) nanocomposite-modified screen-printed carbon electrode (SPCE) was constructed by the facile stepwise electrodeposition method and used for...
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MDPI AG
2023-05-01
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| Series: | Biosensors |
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| Online Access: | https://www.mdpi.com/2079-6374/13/5/563 |
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| author | Yanqing Wu Tao Zhang Lishen Su Xiaoping Wu |
| author_facet | Yanqing Wu Tao Zhang Lishen Su Xiaoping Wu |
| author_sort | Yanqing Wu |
| collection | DOAJ |
| description | Herein, a simple and portable electrochemical sensor based on a reduced graphene oxide/gold nanoparticle/manganese dioxide (rGO/AuNP/MnO<sub>2</sub>) nanocomposite-modified screen-printed carbon electrode (SPCE) was constructed by the facile stepwise electrodeposition method and used for electrochemical detection of As(III). The resultant electrode was characterized for its morphological, structural, and electrochemical properties using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). From the morphologic structure, it can be clearly observed that the AuNPs and MnO<sub>2</sub> alone or their hybrid were densely deposited or entrapped in thin rGO sheets on the porous carbon surface, which may favor the electro-adsorption of As(III) on the modified SPCE. It is interesting that the nanohybrid modification endows the electrode with a significant decrease in charge transfer resistance and an increase in electroactive specific surface area, which dramatically increases the electro-oxidation current of As(III). This improved sensing ability was ascribed to the synergistic effect of gold nanoparticles with excellent electrocatalytic property and reduced graphene oxide with good electrical conductivity, as well as the involvement of manganese dioxide with a strong adsorption property in the electrochemical reduction of As(III). Under optimized conditions, the sensor can detect As(III) via square wave anodic stripping voltammetry (SWASV) with a low limit of detection of 2.4 μg L<sup>−1</sup> and a linear range of 25–200 μg L<sup>−1</sup>. The proposed portable sensor shows the advantages of a simple preparation procedure, low cost, good repeatability, and long-term stability. The feasibility of rGO/AuNPs/MnO<sub>2</sub>/SPCE for detecting As(III) in real water was further verified. |
| first_indexed | 2024-03-11T03:53:50Z |
| format | Article |
| id | doaj.art-822e58c197484307ab7dee4c039459af |
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| issn | 2079-6374 |
| language | English |
| last_indexed | 2024-03-11T03:53:50Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Biosensors |
| spelling | doaj.art-822e58c197484307ab7dee4c039459af2023-11-18T00:41:29ZengMDPI AGBiosensors2079-63742023-05-0113556310.3390/bios13050563Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in WaterYanqing Wu0Tao Zhang1Lishen Su2Xiaoping Wu3Key Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, ChinaKey Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, ChinaKey Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, ChinaKey Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, ChinaHerein, a simple and portable electrochemical sensor based on a reduced graphene oxide/gold nanoparticle/manganese dioxide (rGO/AuNP/MnO<sub>2</sub>) nanocomposite-modified screen-printed carbon electrode (SPCE) was constructed by the facile stepwise electrodeposition method and used for electrochemical detection of As(III). The resultant electrode was characterized for its morphological, structural, and electrochemical properties using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). From the morphologic structure, it can be clearly observed that the AuNPs and MnO<sub>2</sub> alone or their hybrid were densely deposited or entrapped in thin rGO sheets on the porous carbon surface, which may favor the electro-adsorption of As(III) on the modified SPCE. It is interesting that the nanohybrid modification endows the electrode with a significant decrease in charge transfer resistance and an increase in electroactive specific surface area, which dramatically increases the electro-oxidation current of As(III). This improved sensing ability was ascribed to the synergistic effect of gold nanoparticles with excellent electrocatalytic property and reduced graphene oxide with good electrical conductivity, as well as the involvement of manganese dioxide with a strong adsorption property in the electrochemical reduction of As(III). Under optimized conditions, the sensor can detect As(III) via square wave anodic stripping voltammetry (SWASV) with a low limit of detection of 2.4 μg L<sup>−1</sup> and a linear range of 25–200 μg L<sup>−1</sup>. The proposed portable sensor shows the advantages of a simple preparation procedure, low cost, good repeatability, and long-term stability. The feasibility of rGO/AuNPs/MnO<sub>2</sub>/SPCE for detecting As(III) in real water was further verified.https://www.mdpi.com/2079-6374/13/5/563electrochemical sensorgold nanoparticlesmetal oxidesnanocompositesreduced graphene oxidescreen printed carbon electrode |
| spellingShingle | Yanqing Wu Tao Zhang Lishen Su Xiaoping Wu Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water Biosensors electrochemical sensor gold nanoparticles metal oxides nanocomposites reduced graphene oxide screen printed carbon electrode |
| title | Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water |
| title_full | Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water |
| title_fullStr | Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water |
| title_full_unstemmed | Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water |
| title_short | Electrodeposited rGO/AuNP/MnO<sub>2</sub> Nanocomposite-Modified Screen-Printed Carbon Electrode for Sensitive Electrochemical Sensing of Arsenic(III) in Water |
| title_sort | electrodeposited rgo aunp mno sub 2 sub nanocomposite modified screen printed carbon electrode for sensitive electrochemical sensing of arsenic iii in water |
| topic | electrochemical sensor gold nanoparticles metal oxides nanocomposites reduced graphene oxide screen printed carbon electrode |
| url | https://www.mdpi.com/2079-6374/13/5/563 |
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