纳米团簇
荧光
检出限
咪唑酯
碳纤维
沸石咪唑盐骨架
化学
材料科学
金属有机骨架
分析化学(期刊)
纳米技术
核化学
复合数
吸附
无机化学
色谱法
物理化学
光学
物理
复合材料
作者
Roghayeh Jalili,Mahsa Haddad Irani-nezhad,Alireza Khataee,Sang Woo Joo
标识
DOI:10.1016/j.saa.2021.120089
摘要
Herein, we report a ratiometric fluorescent probe based on in situ incorporation of both Gold nanoclusters (AuNCs) and Green emitting carbon dots (gCDs) into zeolitic imidazolate framework-8 (ZIF-8) to analysis of Cephalexin (CFX). Under a single excitation wavelength of 400 nm, the sensor exhibits dual-emissions centered at 520 and 630 nm. The fluorescence of AuNCs (630 nm) is selectively quenched by CFX, whereas the fluorescence of gCDs (520 nm) remains almost constant. The ratiometric fluorescence signal (F520/F630) of the prepared composite (gCDc/AuNCs @ ZIF-8) is linearly proportional to the concentration of CFX from 0.1 to 6 ng/mL with a low detection limit (LOD) of 0.04 ng/mL, which is below the maximum residues limit (MRL) of 100 ng/mL set by the Food and Drug Administration (FDA). Moreover, the designed sensing platform was successfully applied to detect CFX in the milk samples.
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