Abstract
Effects of poly ethylene glycol (PEG) addition on the microstructure and CO sensing characteristics of SnO 2 thin films prepared by sol–gel method were investigated. Microstructure of SnO 2 thin film was drastically developed by the addition of PEG, indicating that the addition of PEG was effective to prevent the agglomeration of SnO 2 particles. CO sensitivity of SnO 2 thin films increased as PEG content increased, and drastically improved to 565 at operating temperature of 773 K. This result shows about 12 times larger than that of PEG-free SnO 2 thin film (48). It is considered that the enhancement of the sensitivity was caused by high surface area of nano-sized SnO 2 particles.
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