Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 16, Issue 5-6, Pages 886-892Publisher
SPRINGER
DOI: 10.1007/s11666-007-9076-x
Keywords
gas sensors; nanocrystalline; plasma spray; isolution precursor
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In this article, we proposed a rapid and continuous process for the production of nanoporous coatings for functional applications. Experiments following two statistical designs were implemented to screen and investigate the spraying parameters' effects on coating crystallinity and porosity in order to gain a better understanding. The spraying standoff distance, solution flow rate and power were identified as having significant effects on coating porosity and crystallinity. The result yielded a peculiar microstructure comprised of interpenetrating pores and layered structures with embedded pores. A deposition mechanism was postulated to explain this microstructure. Ethanol gas sensors that are constructed from the coatings had comparable sensitivities to those reported in the literature for thick-film coatings and had a maximum sensitivity near 200 degrees C.
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