Assembling Tin Dioxide Quantum Dots to Graphene Nanosheets by a Facile Ultrasonic Route

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• 作者：Chen Chen ; Lijun Wang ; Yanyu Liu ; Zhiwen Chen ; Dengyu Pan ; Zhen Li ; Zheng Jiao ; Pengfei Hu ; Chan-Hung Shek ; C. M. Lawrence Wu ; Joseph K. L. Lai ; Minghong Wu
• 刊名：Langmuir
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：29
• 期：12
• 页码：4111-4118
• 全文大小：558K
• 年卷期：v.29,no.12(March 26, 2013)
• ISSN：1520-5827

文摘

Nanocomposites have significant potential in the development of advanced materials for numerous applications. Tin dioxide (SnO₂) is a functional material with wide-ranging prospects because of its high electronic mobility and wide band gap. Graphene as the basic plane of graphite is a single atomic layer two-dimensional sp² hybridized carbon material. Both have excellent physical and chemical properties. Here, SnO₂ quantum dots/graphene composites have been successfully fabricated by a facile ultrasonic method. The experimental investigations indicated that the graphene was exfoliated and decorated with SnO₂ quantum dots, which was dispersed uniformly on both sides of the graphene. The size distribution of SnO₂ quantum dots was estimated to be ranging from 4 to 6 nm and their average size was calculated to be about 4.8 卤 0.2 nm. This facile ultrasonic route demonstrated that the loading of SnO₂ quantum dots was an effective way to prevent graphene nanosheets from being restacked during the reduction. During the calcination process, the graphene nanosheets distributed between SnO₂ nanoparticles have also prevented the agglomeration of SnO₂ nanoparticles, which were beneficial to the formation of SnO₂ quantum dots.