期刊
INORGANICS
卷 10, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/inorganics10120219
关键词
MnO2; rGO composite; 4-NP; cyclic voltammetry; electrochemical sensor
资金
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/400]
- DST-Inspire
- Korea Innovation Foundation (INNOPOLIS) - Korean government (MSIT) [2020-DD-UP-0278]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1A5A8080290]
In this study, a hybrid composite of MnO2 and rGO was synthesized using a hydrothermal method and applied as a sensing material for 4-nitrophenol detection. The fabricated MnO2/rGO/GCE exhibited a reasonable detection limit and good selectivity, stability, and repeatability.
Recently, the electrochemical sensing approach has attracted materials/electrochemical scientists to design and develop electrode materials for the construction of electrochemical sensors for the detection of para-nitrophenol (4-NP). In the present study, we have prepared a hybrid composite of MnO2 and rGO (MnO2/rGO) using a hydrothermal approach. The morphological features of the prepared MnO2/rGO composite were studied by scanning electron microscopy, whereas the phase purity and formation of the MnO2/rGO composite were authenticated via the powder X-ray diffraction method. Energy-dispersive X-ray spectroscopy was also employed to analyze the elemental composition of the prepared MnO2/rGO composite. In further studies, a glassy carbon electrode (GCE) was modified with MnO2/rGO composite (MnO2/rGO/GCE) and explored as 4-nitrophenol (4-NP) sensor. The fabricated MnO2/rGO/GCE exhibited a reasonably good limit of detection of 0.09 mu M with a sensitivity of 0.657 mu A/mu Mcm(2). The MnO2/rGO/GCE also demonstrates good selectivity, stability and repeatability in 50 cycles.
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