title: Synthesis of a β-cyclodextrin-modified Ag film by the galvanic displacement on copper foil for SERS detection of PCBs.
abstract: A mono-6-thio-β-cyclodextrin-modified silver film was synthesized via galvanic displacement on copper foil. The prepared silver films could enrich non-polar polychlorinated biphenyls (PCBs) molecules from hydrophilic phase using thiolate β-cyclodextrins (SH-β-CDs) as receptors. The components of as-prepared Ag-coated-Cu (Ag-Cu) film were confirmed by powder X-ray diffraction (XRD). Both surface-enhanced Raman spectroscopy (SERS) and energy dispersive X-ray spectroscopy (EDS) measurements gave strong evidences that the thiolated β-cyclodextrins (SH-β-CDs) had been immobilized on the surface of silver film. Compared to the substrates prepared in the absence of SH-β-CD, the surface morphology of the CD-modified Ag films was obviously changed. The interfacial enrichment and the capability of substrates to form inclusion complexes with PCBs molecules were tested by using PCB-15 (4,4'-dichlorobiphenyl) as the probe molecules via SERS technique. The measured SERS spectra could distinguish the PCB-15 molecules at micro-molar level according to the most intense CCC bending in-plane mode of PCBs. The enhancement factor (EF) of the SERS substrates for PCB-15 was 1.2×10(5), which was comparable with a number of previous reports.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Department of Chemistry, Shandong University, Jinan 250100, Shandong, PR China.
authors.forename: Jingpeng
authors.initials: J
authors.lastname: Yuan
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Lai
authors.forename: Junling
authors.initials: J
authors.lastname: Duan
authors.forename: Quanqin
authors.initials: Q
authors.lastname: Zhao
authors.forename: Jinhua
authors.initials: J
authors.lastname: Zhan
mesh_terms: D003300:Copper / Q000737:chemistry*; D008567:Membranes, Artificial; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D047392:beta-Cyclodextrins; D012834:Silver; D003300:Copper; D011078:Polychlorinated Biphenyls