A Study on Tin Dioxide Nanoparticles for Gas Sensing
Date Issued
2005
Date
2005
Author(s)
Li, Yun-Shen
DOI
zh-TW
Abstract
This thesis reports investigates on CO sensing due to different sizes of SnO2 nanoparticles as probing material. that were coated on a substrate of comb-type Ag electrode. Sol-gel was synthesized to imbed tin-dioxide nanoparticles with average diameter in a range of 20-50 nm. A gas detection instrument system incorporating our sensing element was set-up for performance evaluation based on signal output implementing the ohmic resistance. Transmission electron spectroscope and X-ray diffraction investigations indicated that the SnO2 nanoparticles grown by sol-gel synthesis process formed crystal clustering of rectangle-like. The scattered ring pattern further confirmed that the SnO2 nanoparticles belonged to polycrystalline structure. Performance test showed that the CO sensing signal sensitivity is obviously influenced by operating temperature, and the optimum condition appeared at 350 °C. A linearity output in respond to CO concentration between 20 and 100 ppm was obtained. This shows that it can be served as a calibration curve. Pd (3.5 wt %) doped into SnO2 nanoparticle clusters was shown to increase in sensitivity of approximately 50%. This is presumably duo to the fact that the more electronegative Pd created some defects in SnO2 polycrystals, thus creating more available active sites for CO sensing and enhanced signal condition.
Subjects
二氧化錫
氣體感測器
奈米顆粒體
一氧化碳
tin dioxide
gas sensor
nanoparticles
carbon monoxide
Type
thesis
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