Detection of Ultralow Concentration NO2 in Complex Environment Using Epitaxial Graphene Sensors.
ACS Sens
; 3(9): 1666-1674, 2018 09 28.
Article
en En
| MEDLINE
| ID: mdl-30073834
ABSTRACT
We demonstrate proof-of-concept graphene sensors for environmental monitoring of ultralow concentration NO2 in complex environments. Robust detection in a wide range of NO2 concentrations, 10-154 ppb, was achieved, highlighting the great potential for graphene-based NO2 sensors, with applications in environmental pollution monitoring, portable monitors, automotive and mobile sensors for a global real-time monitoring network. The measurements were performed in a complex environment, combining NO2/synthetic air/water vapor, traces of other contaminants, and variable temperature in an attempt to fully replicate the environmental conditions of a working sensor. It is shown that the performance of the graphene-based sensor can be affected by coadsorption of NO2 and water on the surface at low temperatures (≤70 °C). However, the sensitivity to NO2 increases significantly when the sensor operates at 150 °C and the cross-selectivity to water, sulfur dioxide, and carbon monoxide is minimized. Additionally, it is demonstrated that single-layer graphene exhibits two times higher carrier concentration response upon exposure to NO2 than bilayer graphene.
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Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Contaminantes Atmosféricos
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Grafito
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Dióxido de Nitrógeno
Tipo de estudio:
Diagnostic_studies
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Prognostic_studies
Idioma:
En
Año:
2018
Tipo del documento:
Article