Investigation of the hydrogen response characteristics for sol-gel-derived Pd-doped, Fe-doped and PEG-added SnO₂ nano-thin films

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• 作者：Zhu BinAuthor Vitae ; Yin Chenbo ; ^{yinchenbo@njut.edu.cn}Author Vitae ; Zhang ZiliAuthor Vitae ; Tao ChunminAuthor Vitae ; Yang LiuAuthor Vitae
• 关键词：Bulk modification ; SnO2 thin film ; Sol&ndash ; gel ; Gas-sensing properties
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：178
• 期：Complete
• 页码：418-425
• 全文大小：1523 K

文摘

This report describes the preparation of undoped, polyethylene glycol (PEG-400)-added, Fe-doped, Pd-doped and Fe-, Pd-doped, PEG-400-added SnO₂ thin films using sol-gel technology. The gas-sensing properties of the five abovementioned structures were investigated over a range of 50-2000 ppm H₂. The linear response magnitude (S) response profile of Fe-, Pd-doped, PEG-400-added SnO₂ thin film toward H₂ concentration (C) was observed, and a concise formula without any transformation was expressed as (correlation coefficient (R) = 0.99803, probability (P) < 0.0001). The selectivity of Fe-, Pd-doped, PEG-400-added SnO₂ thin film toward H₂ in CO and CH₄ defined as S(H₂)/S(CO) and S(H₂)/S(CH₄) was 17.3 and 40.4, respectively, which was better than those of undoped SnO₂ (2.6 and 5.3, respectively) at 225 ¡ãC. A volcano-shaped correlation was observed in Fe-, Pd-doped, PEG-400-added SnO₂ thin film approaching 2000 ppm within a range of 75-275 ¡ãC, and the film's response magnitude measured up to 55.75, even at a low temperature of 75 ¡ãC. The consistency and reproducibility of undoped SnO₂ thin films were investigated and found to be acceptable when considering the mass sensor production. Two important phenomena related to gas response time profile and a ¡°fluctuation¡± that appeared at the bottom of every gas response profile were observed and qualitatively analyzed for the first time in this study.