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Sensors 2009, 9(11), 8996-9010; doi:10.3390/s91108996

H2 Sensing Response of Flame-spray-made Ru/SnO2 Thick Films Fabricated from Spin-Coated Nanoparticles

Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50202, Thailand
Nanoscience Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50202, Thailand
National Electronics and Computer Technology Center, Pathumthani, 12120, Thailand
Author to whom correspondence should be addressed.
Received: 7 August 2009 / Revised: 21 October 2009 / Accepted: 22 October 2009 / Published: 11 November 2009
(This article belongs to the Special Issue Gas Sensors 2009)
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High specific surface area (SSABET: 141.6 m2/g) SnO2 nanoparticles doped with 0.2–3 wt% Ru were successfully produced in a single step by flame spray pyrolysis (FSP). The phase and crystallite size were analyzed by XRD. The specific surface area (SSABET) of the nanoparticles was measured by nitrogen adsorption (BET analysis). As the Ru concentration increased, the SSABET was found to linearly decrease, while the average BET-equivalent particle diameter (dBET) increased. FSP yielded small Ru particles attached to the surface of the supporting SnO2 nanoparticles, indicating a high SSABET. The morphology and accurate size of the primary particles were further investigated by TEM. The crystallite sizes of the spherical, hexagonal, and rectangular SnO2 particles were in the range of 3–10 nm. SnO2 nanorods were found to range from 3–5 nm in width and 5–20 nm in length. Sensing films were prepared by the spin coating technique. The gas sensing of H2 (500–10,000 ppm) was studied at the operating temperatures ranging from 200–350 °C in presence of dry air. After the sensing tests, the morphology and the cross-section of sensing film were analyzed by SEM and EDS analyses. The 0.2%Ru-dispersed on SnO2 sensing film showed the highest sensitivity and a very fast response time (6 s) compared to a pure SnO2 sensing film, with a highest H2 concentration of 1 vol% at 350 °C and a low H2 detection limit of 500 ppm at 200 °C.
Keywords: SnO2; ruthenium; flame spray pyrolysis; H2 sensor SnO2; ruthenium; flame spray pyrolysis; H2 sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liewhiran, C.; Tamaekong, N.; Wisitsoraat, A.; Phanichphant, S. H2 Sensing Response of Flame-spray-made Ru/SnO2 Thick Films Fabricated from Spin-Coated Nanoparticles. Sensors 2009, 9, 8996-9010.

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