Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   APRIL 2003 , Volume 16 , Number 1 (TRANSACTIONS B: APPLICATIONS); Page(s) 33 To 40.
 
Paper: 

THICKNESS DEPENDENCE OF SENSITIVITY IN THIN FILM TIN OXIDE GAS SENSORS DEPOSITED BY VAPOR PYROLYSIS

 
 
Author(s):  HOSSEIN BABAEI F.*, ORVATINIA M.*
 
* Toosi University of Technology Tehran, Iran
 
Abstract: 
Transparent SnO2 thin films were deposited on porcelain substrates using a chemical vapor deposition technique based on the hydrolysis of SnCl4 at elevated temperatures. A reduced pressure self-contained evaporation chamber was designed for the process where the pyrolysis of SnCl4 at the presence of water vapor was carried out. Resistive gas sensors were fabricated by providing ohmic contacts on the layers obtained and the installation of a custom made micro-heater beneath the substrate. The sensitivity (S = Ra/Rg) of the fabricated sensors to acetone vapor contamination was measured at 270 ?C. S increased linearly with contamination level up to 8000 PPM, and saturation was observed at higher concentrations. The experimental relationship between S and thickness of the sensitive film was investigated in films obtained by CVD for the first time. It was shown that S was inversely related to the film thickness, and higher S values were recorded for thinner sensors. The upper limit for S was imposed by the conduction instabilities observed in the thinnest films deposited.
 
Keyword(s): GAS SENSOR, RESISTIVE GAS SENSOR, SENSITIVITY, TIN OXIDE, LPCVD
 
References: 
  • ندارد
 
  pdf-File tarjomyar Yearly Visit 89
 
Latest on Blog
Enter SID Blog