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Highly sensitive electrochemical analysis of tunnel structured MnO2 nanoparticle-based sensors on the oxidation of nitrite.
- Source :
-
Sensors & Actuators B: Chemical . Feb2019, Vol. 281, p746-750. 5p. - Publication Year :
- 2019
-
Abstract
- Graphical abstract Highlights • Different tunnel structured MnO 2 nanoparticles were synthesized and characterized. • The first investigation on the effect of tunnel structured MnO 2 on electrochemical oxidation of nitrite. • α-MnO 2 found to be the most reactive structure for electrochemical sensing. Abstract Three MnO 2 nanoparticles with different tunnel structures, α-, β-, and γ-MnO 2 , were synthesized and characterized. We demonstrated and compared their capabilities on the electrochemical oxidation of nitrite, providing a new perspective for MnO 2 or MnO 2 based materials on sensing application. α-MnO 2 exhibited higher electrochemical reactivity than β- or γ-MnO 2 , which was ascribed to its higher conductivity, more exposure to MnO 6 edges, longer average Mn O bond length, and lower Mn average oxidation state(AOS). We hereby reported the first α-MnO 2 nanoparticle-based electrochemical sensor for nitrite sensing. A highly controlled micro-plotter was used to deposit the MnO 2 nanoparticles for the sensor fabrication, providing a micro-pattern of the sensing surface area of MnO 2 and ensuring the reproducibility and sensitivity of this MnO 2 based sensor. Using differential pulse voltammetry, a detection range of 10–800 μM of nitrite was accomplished along with a sensitivity of 17.1 μA μM−1 and a detection limit of 0.5 μM. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 281
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 133972336
- Full Text :
- https://doi.org/10.1016/j.snb.2018.11.014