Porosity tuned NiO nanocrystallites by solution combustion synthesis for the development of a voltammetric sensor for dopamine
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Nickel oxide (NiO) nanocrystallites of porous structure were synthesised by solution combustion method. The influence of F/O ratio on the structural, morphological and electrochemical parameters was investigated. The sample synthesized at F/O ratio 0.4 had a crystallite size of 5 nm. This sample possesses greater surface area and high porosity whereas the sample synthesized at F/O 0.2 was not porous and had lower surface area. Porous NiO was used to modify the carbon paste electrode for the selective detection of dopamine (DA) in the presence of a lot of excess ascorbic acid and uric acid. Sodium dodecyl sulphate (SDS) casting onto the NiO modified electrode improves the performance towards DA. NiO/SDS/MCPE electrode is completely insensitive to ascorbic acid signals below 1.0 × 10−3 M and enables the accurate quantification of DA in presence of 1000 fold excess of UA (uric acid). The fabricated electrode shows good reproducibility, stability and linear dynamic range of 0.3–300 µM.
KeywordsNiO F/O ratio Dopamine Combustion SDS Carbon paste electrode
The authors are thankful for the financial support given by UGC in the form of a minor project to Dr. Nygil Thomas, Department of Chemistry, Nirmalagiri College. Shimna T gratefully acknowledges the support from CSIR as JRF. This work has also been supported by UGC-Innovative programme and DST-FIST programs of Nirmalagiri College, Nirmalagiri. The authors are also thankful for the SEM Characterisation facilities provided by Balram Sahoo’s Group at IISc, Bangalore. We also appreciate the fruitful discussion we had with Dr. Jobin Cyriac regarding the BET analysis and Dr Sudheesh VD regarding the PXRD analysis.
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