Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
ACS Nano. 2012 Mar 27;6(3):2237-44. doi: 10.1021/nn204289t. Epub 2012 Feb 16.
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 (0D) 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 1D nanotube structure of 0D 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 flat graphene sheets. The unique architecture of 1D nanotubes of 0D GQDs provides a new point of view for designing and fabricating SERS substrates.
石墨烯量子点（GQDs）是一种仅有几个纳米大小的单或少层石墨烯，是一种具有独特性质的新型量子点（QDs）。通过 QDs 的几何上精确的组装，为获得组装 QDs 的整体性能提供了机会。在当前的研究中，我们展示了零维（0D）功能 GQDs 到一维纳米管（NT）阵列的良好组装，并展示了它们作为一种新的无金属高效表面增强拉曼散射（SERS）应用平台的显著潜力。在纳米多孔 AAO 模板内，通过电泳沉积制备了具有分级多孔结构的 0D GQDs 一维纳米管。基于 GQDs 的独特多孔纳米管结构，GQD-NTs 可以确保在目标分子和 GQDs 之间实现更有效的电荷转移，从而产生更强的 SERS 效应，超过了在平坦石墨烯片上的效应。0D GQDs 的一维纳米管独特的结构为设计和制造 SERS 衬底提供了一个新的视角。
