Abstract
The 0.45 mol% Ru-doped SnO 2 (Ru-SnO 2) hollow spheres, each with a shell thickness of ∼17 nm, were prepared by the uniform coating of Ru- and Sn-precursors onto SiO 2 microspheres with diameters of ∼300 nm, followed by heat treatment at 350°C and subsequent removal of the core SiO 2 using a dilute HF solution. The Ru-SnO 2 hollow spheres showed high responses to 5 ppm trimethylamine (TMA) at 350°C with negligible cross-responses to toluene, benzene, NH 3, CO, H 2, and C 3H 8 and decreased cross-responses to C 2H 5OH, while undoped SnO 2 hollow spheres showed similar responses to TMA and C 2H 5OH. The selective and sensitive detection of TMA that was achieved in Ru-doped SnO 2 hollow spheres is explained in relation to the catalytic sensitization of Ru and the gas-accessible hollow morphology of the thin shell configurations.
Original language | English |
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Pages (from-to) | 733-738 |
Number of pages | 6 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 166-167 |
DOIs | |
Publication status | Published - 2012 May 20 |
Bibliographical note
Funding Information:This work was supported by KOSEF NRL program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0 ).
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
Keywords
- Gas sensors
- Hollow spheres
- Ru-SnO
- Trimethylamine
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry