期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 910, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164916
关键词
SERS optical fiber probe; Methimazole; Hexavalent chromium; Ultrahigh sensitivity; Silver nanoparticle; Heavy metal
资金
- National Natural Science Foundation of China [51772224]
- Open Projects Foundation of Yangtze Optical Fiber and Cable Joint Stock Limited Company [SKLD1705]
A novel methimazole-functionalized SERS optical fiber probe was developed for ultrasensitive determination of Cr(VI) with high stability and reproducibility, surpassing other reported techniques in terms of sensitivity.
Ultrasensitive detection of highly toxic Cr(VI) is of paramount importance as trace amount of Cr(VI) will result in inevitable deterioration to human health and the environment. In this work, a novel methimazolefunctionalized SERS optical fiber probe was used for the first time for Cr(VI) determination with ultrahigh sensitivity. A special functionalization process of methimazole was designed after successful fabrication of silver coated fiber probe via a SnCl2-sensitized solvothermal method. Dual functional methimazole guaranteed ultrahigh sensitivity and good stability of the SERS fiber probe for Cr(VI) detection. On one hand, methimazole functions as a Raman reporter which exhibits SERS peak intensity decline in the presence of Cr (VI). On the other hand, methimazole acts as an oxidation inhibitor via coordinating with silver atoms through the lone pair of nitrogen and sulfur atoms. The optimized SERS fiber probe not only presents good stability and excellent reproducibility, but also exhibits ultrahigh sensitivity (10(-11) M) which exceeds SERS or other techniques for Cr(VI) determination reported so far. (C) 2022 Elsevier B.V. All rights reserved.
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