Enhanced H₂ Sensing of SnO₂ Nanowires Functionalized with Pt and Pd Catalyst Nanoparticles

Abstract:

SnO₂ nanowires with a tetragonal structure were synthesized by thermal evaporation of tin grains at 900 °C. The obtained SnO₂ nanowires were doped with Pt and Pd. The morphology, crystal structure, and H₂ sensing properties of undoped, Pt-doped, and Pd-doped SnO₂ nanowires were investigated. SnO₂ nanowires were approximately 30–200 nm in diameter and several tens of micrometers in length. Gas sensors based on undoped, Pt-doped, and Pd-doped SnO₂ nanowires showed a reversible response to H₂ at an operating temperature of RT–300 °C. The response was improved in the order undoped < Pt-doped < Pd-doped SnO₂ nanowire sensors under the same conditions. The highest response upon exposure to 1000 ppm H₂ was 252.9 at 100 °C for Pd-doped SnO₂ nanowire sensor. The results demonstrated that impurity doping improved the sensor response and lowered the operating temperature at which the sensor response was maximized.

• Periodical: Applied Mechanics and Materials (Volumes 633-634)
• Pages: 15-20
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.633-634.15
• Online since: September 2014
• Authors: Yan Bai Shen*, Bao Qing Zhang, Xian Min Cao, De Zhou Wei, Li Jun Jia
• Keywords: Gas Sensor, Hydrogen, Impurity, Nanowires, TiN Oxide

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