Synthesis of a ¦Â-cyclodextrin-modified Ag film by the galvanic displacement on copper foil for SERS detection of PCBs

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• 作者：Jingpeng Yuan ; Yongchao Lai ; Junling Duan ; Quanqin Zhao ; Jinhua Zhan  ; ;   ; ^{jhzhan@sdu.edu.cn}
• 关键词：Polychlorinated biphenyls (PCBs) ; Detection ; Surface-enhanced Raman spectroscopy (SERS) ; Cyclodextrins (CDs) ; Silver films
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 January 2012
• 年：2012
• 卷：365
• 期：1
• 页码：122-126
• 全文大小：708 K

文摘

A mono-6-thio-¦Â-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 ¦Â-cyclodextrins (SH-¦Â-CDs) as receptors. The components of as-prepared Ag-coated-Cu (Ag¨CCu) 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 ¦Â-cyclodextrins (SH-¦Â-CDs) had been immobilized on the surface of silver film. Compared to the substrates prepared in the absence of SH-¦Â-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 ¡Á 10⁵, which was comparable with a number of previous reports.