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- Title
Manganese oxide nanoparticles electrodeposited on graphenized pencil lead electrode as a sensitive miniaturized pH sensor.
- Authors
Mohammad-Rezaei, Rahim; Soroodian, Sahand; Esmaeili, Ghadir
- Abstract
pH monitoring in micro volume samples is required for environmental and clinical analysis. Low cost, miniaturized and stable metal oxide based pH sensors could be a suitable alternative to glass electrodes. In this study, a sensitive potentiometric solid state pH sensor based on manganese oxide nanoparticles electrodeposited on graphenized pencil lead electrode (MnO2/GPLE) was reported. The prepared MnO2/GPLE was carefully characterized by SEM, XRD and electrochemical techniques. To miniaturize the prepared pH sensor, a stainless steel 304 needle was used as a reference electrode. Selectivity, response time, stability and reproducibility of the miniaturized pH sensor were studied and compared with conventional glass pH electrode. According to experimental results, a near-Nernstian slope of − 57.051 mV/pH and linearity over the pH range of 1.5-12.5 were obtained for the developed MnO2/GPLE pH sensor. The prepared sensor represented high ion selectivity to mono-valence and multi-valence ions with -logKA,BPot values around 6.49. A fast response time of 20 s in acidic medium and 60 s in alkaline medium, long-term stability and reproducibility in 2 months, the simplicity of fabrication, low cost and accuracy makes this sensor as a suitable choice for rapid pH recording in micro volume samples. The MnO2/GPLE pH sensor was successfully used for the pH monitoring of human tear, human blood, saliva, apple juice, lemon juice, milk, and vinegar samples with satisfactory results.
- Subjects
ELECTRODES; GRAPHENE; ELECTROPLATING; MANGANESE oxides; NANOPARTICLES
- Publication
Journal of Materials Science: Materials in Electronics, 2019, Vol 30, Issue 3, p1998
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-018-0471-5