Ultra-sensitive hydrogen gas sensors based on Pd-decorated tin dioxide nanostructures: Room temperature operating sensors
✍ Scribed by Jun Min Lee; Ji-eun Park; Seri Kim; Sol Kim; Eunyoung Lee; Sung-Jin Kim; Wooyoung Lee
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 875 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0360-3199
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✦ Synopsis
We have investigated the fabrication of hydrogen gas sensors based on networks of Pd nanoparticles (NPs) deposited tin dioxide nanowires (NWs). SnO 2 NWs with tin NPs attached on the surface were obtained by a simple thermal evaporation of SnO crystalline powders. The tin dioxide NWs were decorated with Pd NPs by the reduction process in Pd ion solution. The sensors showed ultra-high sensitivity (w1.2 Â 10 5 %) and fast response time (w2 s) upon exposure to 10,000 ppm H 2 at room temperature. These sensors were also found to enable a significant electrical conductance modulation upon exposure to extremely low concentrations (40 ppm) of H 2 in the air. Our fabrication method of sensors combining with Pd NPs, Sn NPs and n-type semiconducting SnO 2 NWs allows optimized catalytic and depletion effect and results the production of highly-sensitive H 2 sensors that exhibit a broad dynamic detection range, fast response times, and an ultra-low detection limit.