Ag nanoparticles modified TiO₂ spherical heterostructures with enhanced gas-sensing performance

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• 作者：Xiaoli Cheng^a ; Yingming Xu ; ^a ; ^{ymxu79@yahoo.com.cn"" rel=""nofollow} ; Shan Gao^a ; Hui Zhao^a ; Lihua Huo ; ^a ; ^{lhhuo68@yahoo.com"" rel=""nofollow} [Author vitae]
• 关键词：Ag– ; TiO₂ heterostructure ; Spherical colloids ; Gas-sensing ; Ethanol ; Acetone
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2011
• 出版时间：20 July 2011
• 年：2011
• 卷：155
• 期：2
• 页码：716-721
• 全文大小：730 K

文摘

Monodispersed TiO₂ spherical colloids with diameters of about 250 nm were prepared by a sol–gel method. Heterostructural Ag–TiO₂ spheres were manipulated by surface engineering, in which the Ag nanoparticles with an average size of 10 nm were uniformly distributed on the surface of the TiO₂ nanospheres by in situ reduction and growth. The gas-sensing properties of the TiO₂ nanospheres and heterostructural Ag–TiO₂ nanospheres to ethanol and acetone were measured at 350 °C. The results indicated that Ag nanoparticles greatly enhanced the response, stability and response characteristic of TiO₂ nanospheres to the tested gases. Response times of Ag–TiO₂ sensor to 30 ppm acetone and 50 ppm ethanol were <5 s.