TY - JOUR
T1 - Effect of low temperature composite catalyst loading (LTC2L) on sensing properties of nano gas sensor
AU - Hong, Sung Jei
AU - Han, Jeong In
PY - 2004/4/15
Y1 - 2004/4/15
N2 - Effect of low temperature composite catalyst loading (LTC2L) method on sensing properties of nano gas sensor to 500-10000ppm CH4 gas was investigated. The LTC2L method is to load Pd-Pt composite catalyst onto the SnO2 nanoparticle of which mean size is 15nm below 300°C. Sensing materials were synthesized using the LTC2L method and were applied to thick film nano gas sensor for characterization. The thick film sensing layer was fabricated by screen printing the paste including sensing material and organic solvents on alumina substrate and heat-treating at 500 and 600°C, respectively. Composition ratio of Pd:Pt was controlled to 1wt.%:2wt.%, 2wt.%:1wt.%, and 3.5wt.%:1.5wt.%, respectively. The sensitivity is defined as the ratio of R3500/R1000, the resistance at 3500ppm CH4 gas divided by the resistance at 1000ppm. As a result, nano gas sensor with Pt rich catalyst showed the enhanced sensitivity. Also, an excellent sensitivity of 0.58 could be achieved by the nano gas sensor with the ratio of 3.5wt.%:1.5wt.%. Accordingly, the LTC2L method was successfully applied to the synthesis of ultrafine gas sensing material, and the nano gas sensor with good sensing properties could be fabricated by applying the LTC2L method.
AB - Effect of low temperature composite catalyst loading (LTC2L) method on sensing properties of nano gas sensor to 500-10000ppm CH4 gas was investigated. The LTC2L method is to load Pd-Pt composite catalyst onto the SnO2 nanoparticle of which mean size is 15nm below 300°C. Sensing materials were synthesized using the LTC2L method and were applied to thick film nano gas sensor for characterization. The thick film sensing layer was fabricated by screen printing the paste including sensing material and organic solvents on alumina substrate and heat-treating at 500 and 600°C, respectively. Composition ratio of Pd:Pt was controlled to 1wt.%:2wt.%, 2wt.%:1wt.%, and 3.5wt.%:1.5wt.%, respectively. The sensitivity is defined as the ratio of R3500/R1000, the resistance at 3500ppm CH4 gas divided by the resistance at 1000ppm. As a result, nano gas sensor with Pt rich catalyst showed the enhanced sensitivity. Also, an excellent sensitivity of 0.58 could be achieved by the nano gas sensor with the ratio of 3.5wt.%:1.5wt.%. Accordingly, the LTC2L method was successfully applied to the synthesis of ultrafine gas sensing material, and the nano gas sensor with good sensing properties could be fabricated by applying the LTC2L method.
KW - Composite catalyst loading
KW - Low temperature
KW - LTCL
KW - Nano gas sensor
UR - http://www.scopus.com/inward/record.url?scp=2142819993&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2003.12.015
DO - 10.1016/j.sna.2003.12.015
M3 - Article
AN - SCOPUS:2142819993
SN - 0924-4247
VL - 112
SP - 80
EP - 86
JO - Sensors and Actuators A: Physical
JF - Sensors and Actuators A: Physical
IS - 1
ER -