Highly sensitive and selective trimethylamine sensors using Ru-doped SnO2 hollow spheres
- Authors
- Kim, Kang-Min; Choi, Kwon-Il; Jeong, Hyun-Mook; Kim, Hyo-Joong; Kim, Hae-Ryong; Lee, Jong-Heun
- Issue Date
- 20-5월-2012
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Ru-SnO2; Hollow spheres; Trimethylamine; Gas sensors
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.166, pp.733 - 738
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 166
- Start Page
- 733
- End Page
- 738
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/108408
- DOI
- 10.1016/j.snb.2012.03.049
- ISSN
- 0925-4005
- Abstract
- The 0.45 mol% Ru-doped SnO2 (Ru-SnO2) hollow spheres, each with a shell thickness of similar to 17 nm, were prepared by the uniform coating of Ru- and Sn-precursors onto SiO2 microspheres with diameters of similar to 300 nm, followed by heat treatment at 350 degrees C and subsequent: removal of the core SiO2 using a dilute HF solution. The Ru-SnO2 hollow spheres showed high responses to 5 ppm trimethylamine (TMA) at 350 degrees C with negligible cross-responses to toluene. benzene, NH3, CO, H-2, and C3H8 and decreased cross-responses to C2H5OH, while undoped SnO2 hollow spheres showed similar responses to TMA and C2H5OH. The selective and sensitive detection of TMA that was achieved in Ru-doped SnO2 hollow spheres is explained in relation to the catalytic sensitization of Ru and the gas-accessible hollow morphology of the thin shell configurations. (C) 2012 Elsevier B.V. All rights reserved.
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