Gas sensing properties of nano SnO2 based thick films prepared by dip coating method with effect of molarity of PtCl2 solution

• Published in: Journal of materials science. Materials in electronics Vol. 19; no. 6; pp. 547 - 552
• Main Authors: Garje, Anil D., Aiyer, Rohini C.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.06.2008; Springer; Springer Nature B.V
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids); Materials; Materials Science; Methods of deposition of films and coatings; film growth and epitaxy; Optical and Electronic Materials; Physics; Screen printing; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; PtCl2; Subsequent Thermal Treatment; Full Width Half Maximum; SnO2; Thick Film; Aluminium oxide; Heat treatment; Measurement sensor; Glass; Adhesion; Coated material; Optimization; Powder; Serigraphy; Spatial distribution; Thick film; Response time; Platinum; Tin oxide; Dip coating
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-007-9384-4

Synthesized nanophase SnO 2 powder was used as a functional material along with optimized 15 wt% of glass, fired at 550 °C for better adhesion, to fabricate thick films using screen printing on alumina substrate. Their surface was modified by dip coating in platinum chloride solution (PtCl 2 ) of different molarities (0.05–0.2 M). A subsequent thermal treatment to these thick films was carried out at an optimized temperature of 750 °C in air atmosphere. The films were tested for 400 ppm concentration of H 2 , CO and LPG. Sensors dip coated with 0.15 M solution of PtCl 2 show the highest sensitivity towards the test gases which is ten times higher than undoped SnO 2 sensors.XRD, EDX and SEM measurements showed that the behavior could be associated with the spatial distribution of the platinum within the tin oxide film. The sensors have fast response time of 10 s to all the three gases with a minimum detection limit of 10 ppm.