Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China.
Nanoscale. 2012 Mar 7;4(5):1776-81. doi: 10.1039/c2nr12015a. Epub 2012 Feb 2.
The rational assembly of quantum dots (QDs) in a geometrically well-defined fashion opens up the possibility of accessing the full potential of the material and allows new functions of the assembled QDs to be achieved. In this work, well-confined two-dimensional (2D) and 3D carbon quantum dot (CQD) honeycomb structures have been assembled by electrodeposition of oxygen-rich functional CQDs within the interstitial voids of assemblies of SiO(2) nanospheres, followed by extraction of the SiO(2) cores with HF treatment. Although made from quantum sized carbon dots, the CQD assemblies present a solid porous framework, which can be further used as a sacrificial template for the fabrication of new nanostructures made from other functional materials. Based on the unique honeycomb architecture of the CQDs, which allows the more efficient adsorption of molecules, the formed Au nanoparticles on the CQD honeycomb exhibit 8-11 times stronger surface enhanced Raman scattering (SERS) effect than the widely used Au nanoparticle SERS substrate for the highly sensitive detection of target molecules. This work provides a new approach for the design and fabrication of ultrasensitive SERS platforms for various applications.
通过以几何方式精确地组装量子点(QD)，可以实现对材料全部潜力的挖掘，并使组装后的量子点具有新的功能。在这项工作中，通过在富氧功能 CQD 的组装体的间隙空隙内进行电沉积，然后用 HF 处理提取 SiO2 核，从而组装了具有良好限域的二维(2D)和三维(3D)碳量子点(CQD)蜂窝结构。尽管是由量子点大小的碳点制成，但 CQD 组装体呈现出一种固体多孔骨架，可进一步用作由其他功能材料制成的新型纳米结构的牺牲模板。基于 CQD 的独特蜂窝结构，其允许分子更有效地吸附，在 CQD 蜂窝上形成的 Au 纳米颗粒比广泛用于高灵敏度检测目标分子的 Au 纳米颗粒 SERS 基底的表面增强拉曼散射(SERS)效应强 8-11 倍。这项工作为各种应用的超灵敏 SERS 平台的设计和制造提供了一种新方法。
