کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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239801 | 466232 | 2016 | 6 صفحه PDF | دانلود رایگان |
In this work, we present the effects of mixing sequence of sodium tungstate and nitric acid, as well as the aging duration on the formation of tungsten oxide by sol-gel method. Increase of the aging duration allows the formation of uniform platelet structure where no structure could be detected at 1 aging day while uniform platelet structure could be detected at 30 days. Hydrated tungsten oxide platelets of 1-1.θ зm could be formed by mixing sodium tungstate into nitric acid (sample labeled as W-A) which could be reduced significantly in size to 200-600 nm by changing the mixing sequence to drop nitric acid into sodium tungstate (sample labeled as A-W). Crystalline hydrated tungsten oxides were obtained for both samples where W-A sample shows better degree of crystallinity. Room temperature hydrogen gas sensing property was successfully detected by both samples where A-W sample demonstrates ∼2.5 times higher sensor response to hydrogen gas compared to W-A sample.
Journal: Procedia Chemistry - Volume 19, 2016, Pages 113-118