Title :
Molecular orbital calculation of surface reaction of SnO/sub 2/ gas sensors for aminic and carboxylic smells
Author :
Fujimoto, A. ; Kanashima, Takeshi ; Okuyama, M.
Author_Institution :
Dept. of Electr. Eng., Wakayama Nat. Coll. of Technol., Japan
Abstract :
Surface reactions of SnO/sub 2/ gas sensor for aminic molecules such as methyl and ethyl amine and for carboxylic molecules such as forming and acetic acid have been simulated by molecular orbital calculation and compared with experimental results. The calculated results show that forming acid molecule is adsorbed closer to SnO/sub 2/ cluster surface than methylamine molecule. Experimental results showed the SnO/sub 2/ gas sensor had higher sensitivity for forming acid gas than methylamine gas. These results support that the sensitivity of SnO/sub 2/ gas sensor may be affected for the adsorbed position of gas molecule from the sensor surface.
Keywords :
adsorption; gas sensors; orbital calculations; organic compounds; semiconductor device models; semiconductor materials; sensitivity; tin compounds; SnO/sub 2/; SnO/sub 2/ cluster surface; SnO/sub 2/ gas sensors; acetic acid; adsorption; aminic molecules; aminic smell; carboxylic molecules; carboxylic smells; ethyl amine molecules; forming; methyl molecules; molecular orbital calculation; sensitivity; surface reaction; Atomic measurements; Electrical resistance measurement; Extraterrestrial measurements; Gas detectors; Orbital calculations; Surface resistance; Temperature sensors; Thermal sensors; Tin; Transducers;
Conference_Titel :
TRANSDUCERS, Solid-State Sensors, Actuators and Microsystems, 12th International Conference on, 2003
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7731-1
DOI :
10.1109/SENSOR.2003.1215373
