Imperial College London
Portrait Picture

DrBingLi

Faculty of Medicine, Department of Brain Sciences

Honorary Lecturer
 
 
 
//

Contact

 

b.li

 
 
//

Location

 

Burlington DanesHammersmith Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Black:2018:2053-1583/aac231,
author = {Black, NCG and Rungger, I and Li, B and Maier, SA and Cohen, LF and Gallop, JC and Hao, L},
doi = {2053-1583/aac231},
journal = {2D Materials},
title = {Adsorption dynamics of CVD graphene investigated by a contactless microwave method},
url = {http://dx.doi.org/10.1088/2053-1583/aac231},
volume = {5},
year = {2018}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We use a contactless microwave dielectric resonator gas sensing platform to study the adsorption dynamics of NO2 gas present in air onto a graphene surface. The use of microwaves removes the need for metal contacts that would otherwise be necessary for traditional conductivity measurements, and therefore allows non-invasive determination of NO2 concentrations to sub parts per million. As a result, gas−metal interactions and localised graphene doping in the vicinity of metal contacts are eliminated, with the advantage that only graphene−gas adsorbate interactions are responsible for the measured signal. We show that the sensor response for all considered concentrations can be described using a surface coverage dependent Langmuir model. We demonstrate that the possible variation of the NO2 binding energy, which is frequently considered as the main parameter, plays only a secondary role compared to the rising adsorption energy barrier with increasing NO2 coverage. The continuous distribution of the properties of the graphene adsorption sites used in the theoretical model is supported by our Kelvin probe and Raman surface analysis. Our results demonstrate that the non-invasive microwave method is a promising alternative platform for gas sensing. Moreover it provides valuable insights towards the understanding of the microscopic processes occurring in graphene based gas sensors, which is a key factor in the realization of reproducible and optimized device properties.
AU  - Black,NCG
AU  - Rungger,I
AU  - Li,B
AU  - Maier,SA
AU  - Cohen,LF
AU  - Gallop,JC
AU  - Hao,L
DO  - 2053-1583/aac231
PY  - 2018///
SN  - 2053-1583
TI  - Adsorption dynamics of CVD graphene investigated by a contactless microwave method
T2  - 2D Materials
UR  - http://dx.doi.org/10.1088/2053-1583/aac231
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000432479900003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/60505
VL  - 5
ER  -
Download