Graphene-Quantum-Dot Assembled Nanotubes: A New Platform for Efficient Raman Enhancement
Graphene-Quantum-Dot Assembled Nanotubes: A New Platform for Efficient Raman Enhancement
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DOI：
10.1021/nn204289t
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发表时间：
2012-03-01
期刊：
影响因子：
17.1
通讯作者：
Shi, Gaoquan
中科院分区：
文献类型：
--
作者：
Cheng, Huhu;Zhao, Yang;Shi, Gaoquan
石墨烯量子点(GQD)是一种具有独特性质的新型量子点，它是一种单层或几层石墨烯，其尺寸只有几个纳米。以几何定义良好的方式组装量子点打开了利用集合的集体性质获得组装的量子点的全部潜力的机会。在当前的研究中，我们展示了零维(OD)功能GQD有序组装成一维纳米管(NT)阵列，并展示了它们作为一种新的无金属平台的显著潜力，用于高效的表面增强拉曼散射(SERS)。采用电泳法在纳米孔AAO模板中沉积制备了分级多孔的10纳米管结构的OD-GQD。基于GQD-NTS独特的多孔纳米管结构，GQD-NTS可以确保目标分子与GQD之间更有效的电荷转移，从而产生比平坦的石墨烯更强的SERS效应。OD GQD一维纳米管的独特结构为SERS衬底的设计和制备提供了新的视角。
Graphene quantum dots (GQDs), single or few-layer graphenes with a size of only several nanometers, are a new type of quantum dots (QDs) with unique properties. The assembly of QDs in a geometrically well-defined fashion opens up opportunities to obtain access to the full potential of assembled QDs by virtue of the collective properties of the ensembles. In the current study, we present the well-organized assembly of zero-dimensional (OD) functional GQDs into 1D nanotube (NT) arrays and demonstrate their remarkable potential as a new metal-free platform for efficient surface-enhanced Raman scattering (SERS) applications. The hierarchically porous 10 nanotube structure of OD GQDs has been prepared by electrophoresis deposition within a nanoporous AAO template. On the basis of the unique porous nanotube architecture of GQDs, the GQD-NTs could ensure a more efficient charge transfer between the target molecules and the GQDs and thus produce much stronger SERS effect, exceeding that on fiat graphene sheets. The unique architecture of 1D nanotubes of OD GQDs provides a new point of view for designing and fabricating SERS substrates.