Luminescent Nanoswitch Based on Carbon Dots for Sensitive Detection of Cu(Ⅱ) Ions and Pyrophosphates

doi:10.7503/cjcu20190243

Abstract

Abstract: Carbon dots(CDs) with brightly red fluorescence were prepared via a facile one-step synthesis way by hydroxyl and amino groups to react at high temperature. The as-obtained CDs can overcome the excitation-dependence luminescence behavior for normal routes and the quantum yield is up to 41%. Based on the fluorescent materials, a luminescent nanoswitch through fluorescence on and off in response to specific external stimuli was designed. Fluorescence quenching of CDs by Cu²⁺ is ascribed to the complexation reaction. When pyrophosphate(PPi) is introduced into the system, Cu²⁺ leaves CDs' surface because PPi binds to CDs much stronger than Cu²⁺, resulting in the fluorescence recovery. Following the proposed way, a signal off-on nanoswich sensing system for the detection of Cu²⁺ and PPi with high selectivity and sensitivity was constructed, and the detection limits for Cu²⁺ and PPi are 2.14 μmol/L and 1.85 μmol/L, respectively. This method has been applied in real samples, and this strategy broadens the sensing application of fluorescent CDs, providing the possibility to determine these targets in living systems.

Key words: Carbon dots, Fluorescence sensor, Cu²⁺ detection, Pyrophosphate

CLC Number:

O657.3

TrendMD:

ZHOU Sihui, LI Qiong, ZHANG Ting, PANG Daiwen, TANG Hongwu. Luminescent Nanoswitch Based on Carbon Dots for Sensitive Detection of Cu(Ⅱ) Ions and Pyrophosphates[J]. Chem. J. Chinese Universities, 2019, 40(8): 1593.

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