Detection of Ultralow Concentration NO2 in Complex Environment Using Epitaxial Graphene Sensors
Artikel i vetenskaplig tidskrift, 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

graphene sensors

epitaxial graphene

Hall effect

air quality

Författare

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, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

R. Yakimova

Linköpings universitet

O. Kazakova

National Physical Laboratory (NPL)

ACS Sensors

2379-3694 (eISSN)

Vol. 3 9 1666-1674

Ämneskategorier

Analytisk kemi

Annan kemiteknik

Miljövetenskap

DOI

10.1021/acssensors.8b00364

PubMed

30073834

Mer information

Senast uppdaterat

2018-12-20