Amphipathic carbon dots with solvent-dependent optical properties and sensing application
Amphipathic carbon dots with solvent-dependent optical properties and sensing application
复制标题
具有溶剂依赖性光学特性的两亲性碳点和传感应用
DOI：
10.1016/j.optmat.2019.01.021
复制
发表时间：
2019-03-01
影响因子：
3.9
通讯作者：
Guo, Ruiqian
中科院分区：
文献类型：
--
作者：
Mei, Shiliang;Wei, Xian;Guo, Ruiqian
碳量子点（CD）因其突出的光学特性而被认为是一种新型的无重金属荧光材料。本工作以对苯二胺为原料，采用溶剂热法一步合成了两亲性环糊精。所得到的环糊精具有大量的表面官能团，这使得它们在不同溶剂中具有显著的荧光性。采用吸收光谱、稳态光谱和时间分辨光谱研究了表面基团和不同溶剂分子对CD光学性质的相互影响。当所制备的CD溶解在不同溶剂中时，可以观察到从蓝色到绿色的可调谐发射和严格的激发无关发射特性的强溶致变色行为，表明它们作为溶致变色染料分子的替代物的可行的传感应用。此外，使用合成的CD作为传感探针实现了对Cu 2+离子的高选择性检测。这些具有溶剂依赖性光学性质和选择性检测Cu2+的CD有望在生物成像和生物检测方面具有广阔的应用前景。
Carbon dots (CDs) have been regarded as novel heavy-metal-free fluorescent materials because of their prominent optical features. In this work, one type of amphipathic CDs is prepared by facile one-step solvothermal treatment of p-Phenylenediamine. The obtained CDs own numerous surface function groups which endow them prominent dispersibility in different solvents. Absorption, steady-state and time-resolved spectroscopy have been adopted to investigate the mutual influence between the surface groups and different solvent molecules on the optical properties of the CDs. Strong solvatochromic behavior with tunable emission from blue to green and strict excitation-independent emission characteristic can be observed when the as-prepared CDs are dissolved in different solvents, suggesting their feasible sensing applications as an alternative of solvatochromic dye molecules. Furthermore, highly selective detection of Cu2+ ions using the as-synthesized CDs as sensing probes is achieved. It is expected that the investigated CDs with solvent-dependent optical properties as well as selective Cu2+ detection may have broad application prospects in bioimaging and biodetecting.