期刊
ANALYTICA CHIMICA ACTA
卷 1160, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.aca.2021.338380
关键词
Gold nanostar; Lead ion; Colorimetric; Etching
资金
- National Natural Science Foundation of China [21505162, 31571874]
- GrainOil Process and Quality Control 2011 Collaborative and Innovative Grant from Hunan province
- Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning [2020KFJJ02, 2020KFJJ05]
- Training Program for Excellent Young Innovators of Changsha [kq1802043]
- China Scholarship Council
The study proposes a highly sensitive assay for Pb2+ using gold nanostars as probes under the catalytic activity of Pb on etching gold atoms. Through monitoring the color change and longitudinal localized surface plasmon of GNSs, Pb2+ can be detected at concentrations as low as 200 pM with a limit of detection of 1.5 pM.
The sensitivity for analytes of interest is vital for environment protection and food safety. Here, we propose an extremely sensitive assay toward Pb2+ by using gold nanostars (GNSs) as probes based on the catalytic activity of Pb on etching gold atoms after being reduced in the presence of 2-mercaptoethanol (2-ME) and sodium thiosulfate. GNSs were prepared by using 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid as both the reducing and capping agents, enabling high stability and sensitivity for quantitation of Pb2+. Upon increasing Pb2+ concentration over the range of 0-10 uM, GNS solution color changed from greenish-blue to blue to purple to red, and eventually to colorless. The color change can be distinguished by naked eye at the Pb 2 + concentration as low as 200 pM. Through monitoring longitudinal localized surface plasmon of GNSs, Pb2+ could be detected with a limit of detection of 1.5 pM, and the working range is 2 pM-1 mu M. The ultra-high sensitivity of our assay stems from the high catalysis of Pb on etching gold on tips and branches in the presence of 2-ME and sodium thiosulfate, leading to the shape deformation to spherical gold nanoparticle and the corresponding significant changes in their optical properties. The assay provides high selectivity of Pb2+ over the tested interfering metal ions like Cu2+. With high sensitivity and selectivity, the assay was efficiently validated by analyzing water samples and monitoring the migration of Pb2+ from the tested container to water. (C) 2021 Elsevier B.V. All rights reserved.
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