以碳点作为还原剂，通过限制金纳米颗粒的生长来检测硫氰酸盐。

Detection of thiocyanate through limiting growth of AuNPs with C-dots acting as reductant.

作者信息

Lu Qiujun, Liu Yalan, Hou Yuxin, Wang Haiyan, Zhang Youyu, Yao Shouzhuo

机构信息

Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China.

出版信息

Analyst. 2015 Nov 21;140(22):7645-9. doi: 10.1039/c5an01605c.

DOI:10.1039/c5an01605c

PMID:26421502

Abstract

We have found that hydroxyl-rich carbon dots (C-dots) have the ability to reduce Au(3+) to form gold nanoparticles (AuNPs). Thiocyanate (SCN(-)) can be absorbed on the surface of the AuNPs due to its high affinity toward the AuNPs, which inhibits the growth of the AuNPs. Meanwhile, SCN(-) has the ability to etch the as-synthesized big AuNPs to small AuNPs, which can also cause the absorption peak of the AuNPs to decrease. Therefore, an optical sensor is developed for the detection of SCN(-) based on measuring the plasmon resonance absorption peak change of the AuNPs. Under optimal conditions, this method yields excellent sensitivity (the limit of detection is 0.16 μM) and selectivity toward SCN(-). This method can detect SCN(-) in raw milk with satisfactory results. This work gives new insight into monitoring the quality of milk.

摘要

我们发现富含羟基的碳点（C点）具有将Au(3+)还原以形成金纳米颗粒（AuNP）的能力。硫氰酸盐（SCN(-)）因其对AuNP具有高亲和力，可被吸附在AuNP表面，这抑制了AuNP的生长。同时，SCN(-)具有将合成的大AuNP蚀刻成小AuNP的能力，这也会导致AuNP的吸收峰降低。因此，基于测量AuNP的等离子体共振吸收峰变化，开发了一种用于检测SCN(-)的光学传感器。在最佳条件下，该方法对SCN(-)具有出色的灵敏度（检测限为0.16 μM）和选择性。该方法可检测原料乳中的SCN(-)，结果令人满意。这项工作为监测牛奶质量提供了新的见解。