Multistep assembly of Au-loaded SnO₂ hollow multilayered nanosheets for high-performance CO detection

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• 作者：Yifei Bing^aAuthor Vitae ; Yi Zeng^a ; ^{zengyi@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shengrao Feng^aAuthor Vitae ; Liang Qiao^bAuthor Vitae ; Yanzhe Wang^aAuthor Vitae ; Weitao Zheng^a ; ^{wtzheng@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：SnO2 ; Nonspherical hollow structures ; Au-sensitization ; Gas sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：227
• 期：Complete
• 页码：362-372
• 全文大小：4248 K

文摘

The designed preparation of pure and Au-loaded SnO₂ hollow multilayered nanosheets for CO detection has been realized via a rational combination of different purposeful multi-step synthetic route. The synthetic step-dependent shape and structure evolution has been investigated and the formation mechanism for the unique hollow nanosheets is also discussed. The characterized results confirm that flowerlike SnO₂ nanosheets with a polycrystalline rutile structure are assembled from hexagonal mesoporous and multilayered walls, which can further be subdivided into SnO₂ nanoparticles as structural subunits. Furthermore, gas sensors based on the as-prepared pure and Au-loaded SnO₂ have also been fabricated. The Au-loaded SnO₂ hollow nanosheets show significantly lower working temperature, faster response-recovery and improved selectivity to CO in comparison with that of pure SnO₂. Besides structural merits including hollow and easily penetrated multilayered walls, which facilitate the transport rate and augment the adsorption quantity of gas molecule, the significant improvement of the sensing properties is also attributed to the catalytic effect of Au.