Assembling Tin Dioxide Quantum Dots to Graphene Nanosheets by a Facile Ultrasonic Route
Assembling Tin Dioxide Quantum Dots to Graphene Nanosheets by a Facile Ultrasonic Route
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通过简便的超声波路线将二氧化锡量子点组装到石墨烯纳米片上
DOI：
10.1021/la304753x
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发表时间：
2013-03-26
期刊：
影响因子：
3.9
通讯作者：
Wu, Minghong
中科院分区：
文献类型：
--
作者：
Chen, Chen;Wang, Lijun;Wu, Minghong
纳米复合材料在许多应用领域的先进材料开发中具有巨大的潜力。二氧化锡（SnO 2）具有高的电子迁移率和宽的禁带宽度，是一种具有广泛应用前景的功能材料。石墨烯作为石墨的基本面，是一种单原子层二维sp（2）杂化碳材料。两者都具有优良的物理和化学性能。在这里，SnO 2量子点/石墨烯复合材料已成功地通过一个简单的超声方法。实验结果表明，SnO 2量子点均匀地分散在石墨烯的两面，并在石墨烯表面进行了剥离和修饰。SnO 2量子点的尺寸分布估计为4 - 6 nm，其平均尺寸计算为约4.8 +/- 0.2 nm。这种简易的超声路线表明，SnO 2量子点的负载是防止石墨烯纳米片在还原过程中重新堆叠的有效方法。在煅烧过程中，石墨烯纳米片分布在SnO 2纳米颗粒之间，也阻止了SnO 2纳米颗粒的团聚，有利于SnO 2量子点的形成。
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 sp(2) 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 +/- 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.