title: Construction of a Graphene/Au-Nanoparticles/Cucurbit[7]uril-Based Sensor for Pb(2+) Sensing.
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.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China.
authors.forename: Xinhao
authors.initials: X
authors.lastname: Shi
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Gu
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China.
authors.forename: Cuiling
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China.
authors.forename: Longyun
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China. lli@chem.ecnu.edu.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Peng
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, No. 500, Dongchuan Road, Shanghai, 200241, China. yzxian@chem.ecnu.edu.cn.
authors.forename: Yuezhong
authors.initials: Y
authors.lastname: Xian
keywords: Au; Pb; Raman spectroscopy; graphene; nanoparticles