Construction of a Graphene/Au‐Nanoparticles/Cucurbit[7]uril‐Based Sensor for Pb2+ Sensing. Issue 16 (7th March 2016)

• Record Type: Journal Article
• Authors: Shi, Xinhao; Gu, Wei; Zhang, Cuiling; Zhao, Longyun; Li, Li; Peng, Weidong; Xian, Yuezhong
• Is Part Of: Chemistry. Volume 22:Issue 16(2016)
• Page Start: 5643
• Page End: 5648
• Publication Date: 2016-03-07
• Subjects: Au -- graphene -- nanoparticles -- Pb -- Raman spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201505034
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: The development of highly sensitive and selective methods for the detection of lead ion (Pb 2+ ) is of great scientific importance. In this work, we develop a new surface‐enhanced Raman scattering (SERS)‐based sensor for the selective trace measurement of Pb 2+ . The SERS‐based sensor is assembled from gold nanoparticles (AuNPs) and graphene using cucurbit[7]uril (CB[7]) as a precise molecular glue and a local SERS reporter. Upon the addition of Pb 2+, CB[7] forms stronger complexes with Pb 2+ and desorbs from AuNPs, resulting in a sensitive "turn‐off" of SERS signals. This SERS‐based assay shows a limit of detection (LOD) of 0.3 nm and a linear detection range from 1 nm to 0.3 μm for Pb 2+ . The feasibility of the assay is further demonstrated by probing Pb 2+ in real water samples. This SERS‐based analytical method is highly sensitive and selective, and therefore holds promising applications in environmental analysis. Abstract : Turn‐off SERS sensor : A simple surface‐enhanced Raman scattering (SERS)‐based "turn‐off" sensor was assembled from gold nanoparticles (red dots in figure; PDDA=poly(diallyldimethylammonium chloride)) and graphene using cucurbit[7]uril (CB[7]) as a precise molecular glue and a local SERS reporter. This SERS‐based analytical method is highly sensitive and selective towards Pb 2+ and therefore holds promising applications in environmental analysis.