Green synthesis of carbon dots functionalized silver nanoparticles for the colorimetric detection of phoxim

Talanta
Mingda ZhengJiang He

Abstract

In this work, Lycii Fructus as raw materials for green synthesis of fluorescent carbon dots (CDs) reduce AgNO3. The CDs-AgNPs were synthesized by one-step method. CDs were applied to stabilize AgNPs due to abundant functional groups on the surface of CDs. In presence of phoxim, the dispersed CDs-AgNPs get aggregated and the absorption peak with red shift from 400 nm to 525 nm, resulting in the color changed from yellow to red. Under optimized conditions, the absorbance ratio at A525 nm/A400 nm was related linearly to the concentrations of phoxim in the range of 0.1-100 μM. The detection limit was calculated to 0.04 μM, which is lower than maximum residue limits of phoxim in samples in China. The colorimetric sensor was successfully utilized to monitoring phoxim in environmental and fruit samples with good recoveries ranges from 87% to 110.0%. These results showed the sensor had a promising application prospect in real samples.

Citations

Aug 25, 2020·Luminescence : the Journal of Biological and Chemical Luminescence·Zhengwei ZhangJianqiu Chen
Nov 13, 2018·Nano-micro Letters·Kok Ken ChanKen-Tye Yong
Mar 17, 2021·The Analyst·Hafiz Muhammad JunaidMadeeha Batool
Jun 19, 2021·Biological Reviews of the Cambridge Philosophical Society·Sanni M A FärkkiläLeho Tedersoo
Aug 28, 2021·Journal of Hazardous Materials·Xin ZhangWeijun Kong

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