TY - GEN
T1 - Microwave Gas Sensor based on Graphene-loaded Substrate Integrated Waveguide Cavity Resonator
AU - Ali, Mohammad Ashraf
AU - Cheng, Mark Ming Cheng
AU - Chen, Jimmy Ching Ming
AU - Wu, Chung Tse Michael
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/8/9
Y1 - 2016/8/9
N2 - In this paper, novel microwave gas sensors based on graphene-loaded substrate integrated waveguide (SIW) cavity resonators are presented. Two SIW-based cavity resonators, a ring-slot resonator and a complementary split ring resonator (CSRR), are fabricated and coated with chemical vapor deposited (CVD)-grown graphene. The fabricated graphene contains a layer of polymethyl methacrylate (PMMA) on its top. The graphene sheets exhibit high sensitivity to various kinds of polar and non-polar gases. When polar gas contacts the graphene sheet, it will donate or receive electrons, thereby changing its conductance. The SIW cavities thus perform a resonant frequency shift from the perturbation of electron exchange. In the experiment, a frequency shift of 59 MHz and 157 MHz for the SIW ring-slot resonator and CSRR, respectively, can be observed after pure ammonia gas is injected into a closed chamber filled with air at standard atmospheric pressure and temperature. This work demonstrates a very simple and efficient gas sensing scheme in the microwave regime. The proposed devices are promising to be further integrated with RF front-ends, providing a low cost and high sensitive gas sensing and environmental monitoring solution.
AB - In this paper, novel microwave gas sensors based on graphene-loaded substrate integrated waveguide (SIW) cavity resonators are presented. Two SIW-based cavity resonators, a ring-slot resonator and a complementary split ring resonator (CSRR), are fabricated and coated with chemical vapor deposited (CVD)-grown graphene. The fabricated graphene contains a layer of polymethyl methacrylate (PMMA) on its top. The graphene sheets exhibit high sensitivity to various kinds of polar and non-polar gases. When polar gas contacts the graphene sheet, it will donate or receive electrons, thereby changing its conductance. The SIW cavities thus perform a resonant frequency shift from the perturbation of electron exchange. In the experiment, a frequency shift of 59 MHz and 157 MHz for the SIW ring-slot resonator and CSRR, respectively, can be observed after pure ammonia gas is injected into a closed chamber filled with air at standard atmospheric pressure and temperature. This work demonstrates a very simple and efficient gas sensing scheme in the microwave regime. The proposed devices are promising to be further integrated with RF front-ends, providing a low cost and high sensitive gas sensing and environmental monitoring solution.
KW - Ammonia gas sensor
KW - chemical vapor deposition
KW - complementary ring resonators
KW - gas sensor
KW - graphene
KW - substrate integrated waveguide (SIW)
UR - http://www.scopus.com/inward/record.url?scp=84985031180&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84985031180&partnerID=8YFLogxK
U2 - 10.1109/MWSYM.2016.7540295
DO - 10.1109/MWSYM.2016.7540295
M3 - Conference contribution
AN - SCOPUS:84985031180
T3 - IEEE MTT-S International Microwave Symposium Digest
BT - 2016 IEEE MTT-S International Microwave Symposium, IMS 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 IEEE MTT-S International Microwave Symposium, IMS 2016
Y2 - 22 May 2016 through 27 May 2016
ER -