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This paper describes the fabrication and characterization of graphene based carbon dioxide (CO2) gas sensors. Graphene was synthesized by thermal decomposition of SiC. The resistivity CO2 gas sensors were fabricated by pure graphene and graphene decorated Au nanoparticles (NPs). The Au NPs with size of 10 nm were decorated on graphene. Au electrode deposited on the graphene showed Ohmic contact and the sensors resistance changed following to various CO2 concentrations. Resulting in resistance sensor using pure graphene can detect minimum of 100 ppm CO2 concentration at 50oC, whereas Au/graphene can detect minimum 2 ppm CO2 concentration at same at 50oC. Moreover, Au NPs catalyst improved the sensitivity of the graphene based CO2 sensors. The responses of pure graphene and Au/graphene are 0.04% and 0.24%, respectively, at 50oC with 500 ppm CO2 concentration. The optimum working temperature of CO2 sensors is at 75oC.
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참고문헌 (16)
참고문헌 신청
A. Das / 2008 / Monitoring dopants by Raman scattering in an electrochemically top-gated graphene transistor / Nat. Nanotech 3 : 210 ~ 215
A. E. Hoyt / 1998 / SAW sensors for the room-temperature measurement of CO2 and relative humidity / Anal. Chem 70 : 2137 ~ 2145
A. N. Sidorov / 2012 / A surfaceenhanced Raman spectroscopy study of thin graphene sheets functionalized with gold and silver nanostructures by seed-mediated growth / Carbon
B. Bahrami / 2008 / Enhanced CO sensitivity and selectivity of gold nanoparticles-doped SnO2 sensor in presence of propane and methane / Sens. Actuator B-Chem 133 : 352 ~ 35
B. H. Chu / 2011 / Hydrogen detection using platinum coated graphene grown on SiC / Sens. Actuator B-Chem 157 : 500 ~ 503
A. E. Hoyt / 1998 / SAW sensors for the room-temperature measurement of CO2 and relative humidity / Anal. Chem 70 : 2137 ~ 2145
A. N. Sidorov / 2012 / A surfaceenhanced Raman spectroscopy study of thin graphene sheets functionalized with gold and silver nanostructures by seed-mediated growth / Carbon
B. Bahrami / 2008 / Enhanced CO sensitivity and selectivity of gold nanoparticles-doped SnO2 sensor in presence of propane and methane / Sens. Actuator B-Chem 133 : 352 ~ 35
B. H. Chu / 2011 / Hydrogen detection using platinum coated graphene grown on SiC / Sens. Actuator B-Chem 157 : 500 ~ 503
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