One-pot synthesis and improved sensing properties of hierarchical flowerlike SnO₂ assembled from sheet and ultra-thin rod subunits

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• 作者：Hong Chen ; Qingwei Wang ; Chunlei Kou ; Yongming Sui ; Yi Zeng ; Fei Du
• 关键词：SnO2 ; Hierarchical structure ; Hydrothermal synthesis ; Gas sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：April, 2014
• 年：2014
• 卷：194
• 期：Complete
• 页码：447-453
• 全文大小：3261 K

文摘

Self-assembled unusual SnO₂ flowers have been synthesized by a facile one-pot hydrothermal route. FESEM and TEM reveal that these hierarchical SnO₂ flowers, ranging from 600 to 900 nm in size, are composed of two types of building blocks, that is, nanosheets and nanorods. Experimental results obtained from the different growth stages demonstrate that the as-prepared SnO₂ nanostructures exhibit an interesting time-dependent evolution of building blocks, from sheets to ultra-thin rods with diameters down to 5 nm. The possible formation mechanism for the hierarchical nanostructures with various architectures is presented on account of the self-assembled growth induced by Ostwald ripening. Furthermore, the as-prepared SnO₂ nanosheets and nanorods exhibit improved acetone performances in comparison with hierarchical SnO₂ nanosheets due to the additional presence of ultra-thin rodlike subunits. It is found that flowerlike SnO₂ have a response of 11.4-50 ppm acetone at the optimal operating temperature of 310 掳C, and the response and recovery time are within 1.6 and 7.0 s, respectively.