Conductometric NOx sensor based on exfoliated two-dimensional layered MnPSe3

Nitrogen dioxide (NO2) and nitric oxide (NO) collectively called NOx are toxic gases which are emitted during combustion process. Selective detection of NOx at low concentration is essential for human health and environment monitoring. The present study has explored the use of 2D few-layer manganese...

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Published in:Sensors and actuators. B, Chemical Chemical, 2021-11, Vol.347, p.130633, Article 130633
Main Authors: Kumar, Rajat, Jenjeti, Ramesh Naidu, Choutipalli, Venkata Surya Kumar, Subramanian, Venkatesan, Sampath, S.
Format: Article
Language:English
Subjects:
2D layered phosphochalcogenide
Charge transfer
DFT
Exfoliation
Gas sensors
Humidity
Manganese
MnPSe3
Nitric oxide
Nitrogen dioxide
NOx gas sensing
Selectivity
Sensors
Temperature dependence
Thin films
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Summary:Nitrogen dioxide (NO2) and nitric oxide (NO) collectively called NOx are toxic gases which are emitted during combustion process. Selective detection of NOx at low concentration is essential for human health and environment monitoring. The present study has explored the use of 2D few-layer manganese phosphoselenide (MnPSe3) towards selective and reversible NOx (NO2 and NO) sensing under ambient conditions. Few layer MnPSe3 obtained by solvent exfoliation of bulk material is used as uniform thin film for NOx gas sensing. The sensor shows responses of 685% and 137% for the detection of 1 ppm of NO2 and NO gas respectively. The total NOx (sum of NO and NO2) at different ratios of the constituents can be detected as well. The response follows Langmuir-type behavior with high selectivity towards NOx-based gases in presence of H2, O2, CO, CO2 and C2H2. The sensor is completely reversible with fast response and recovery times under ambient conditions. Temperature dependent studies indicate that the sensor response increases upto a certain temperature and then decreases in presence of humidity. The effect of humidity is studied as well. Bulk MnPSe3 has been exfoliated into few layer nanosheets using solvent exfoliation technique and shown to be efficient for NOx gas sensing. [Display omitted] •MnPSe3 is exfoliated into few-layer nanosheets in hexyl-pyrrolidone solvent and assembled as thin film.•MnPSe3 nanosheets show excellent response towards NOx gases.•The sensor shows low detection of limits, highly selectivity and reversibility.•Sensing mechanism is understood based on charge transfer between the analyte and MnPSe3.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2021.130633