Detection of Ultralow Concentration NO2 in Complex Environment Using Epitaxial Graphene Sensors
Journal article, 2018

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.

nitrogen dioxide

environmental monitoring

Hall effect

epitaxial graphene

air quality

graphene sensors


C. Melios

University of Surrey

National Physical Laboratory (NPL)

V. Panchal

National Physical Laboratory (NPL)

Kieran Edmonds

Royal Holloway University of London

Arseniy Lartsev

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

R. Yakimova

Linköping University

O. Kazakova

National Physical Laboratory (NPL)

ACS Sensors

23793694 (eISSN)

Vol. 3 9 1666-1674

Subject Categories

Analytical Chemistry

Environmental Sciences

Condensed Matter Physics





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