The self-assembly of Cu-In-S quantum dots with aggregation-induced emission into 3D network triggered by cation and its application as a novel metal-enhanced fluorescent nanosensor for detecting Zn (Ⅱ)

Autor: Jiayu Dong, Sheng-Mei Wu, Zhengyu Yan, Mingyao Mou, Yi Wu, Hui Zou, Shenghua Liao
Rok vydání: 2019
Předmět:
Zdroj: Sensors and Actuators B: Chemical. 284:265-270
ISSN: 0925-4005
DOI: 10.1016/j.snb.2018.12.055
Popis: A novel self-assembly phenomenon triggered by Zn2+ of Cu-In-S quantum dots with aggregation-induced emission effect was presented in this paper. Hydrophilic Cu-In-S quantum dots with aggregation-induced emission effect were successfully prepared. They were monodisperse spherical nanoparticles with the diameter of 2.8 ± 0.4 nm and had weak fluorescence in aqueous solution. However, the solution emitted strong fluorescence after addition of Zn2+. The results of TEM and SEM indicated the monodisperse quantum dots self-assembled into 3D networks of Cu-In-S quantum dots-Zn2+, which hindered the motion of quantum dots. Besides, the Zn2+ in the mixture passivated the surface defects. The phenomenon also proved by florescence lifetime and XPS. Thus the radiation decay decreased and followed by strong fluorescent emission. Interestingly, the degree of aggregation was proportional to the amount of Zn2+ and the fluorescent intensity. Based on this interesting phenomenon, a novel metal enhanced fluorescent nanosensor for detecting Zn2+ was established. The results demonstrated the proposed method had a good selectivity and linearity in the concentration range of 0–800 nmol L−1 with a limit of detection of 1.99 ppb. These results showed a promising future in the field of metal-enhanced fluorescent probes of the Cu-In-S quantum dots.
Databáze: OpenAIRE
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