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

Yuan, Jingpeng; Lai, Yongchao; Duan, Junling; Zhao, Qiang; Zhan, Jinhua

doi:10.1016/j.jcis.2011.08.075

Cited by 52 publications

(37 citation statements)

References 44 publications

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“…The analyte solutions were prepared by dissolving PCB in ethanol (4.4×10 -4 M), and diluted to a desired concentration with water [24,25]. NPs 20 mg was suspended in 5 mL aqueous solution with different concentrations of PCB-28 (or PCB-52).…”

Section: Absorption Of Fe 3 O 4 @β-Cd For Pcbsmentioning

confidence: 99%

Core–shell superparamagnetic Fe3O4@β-CD composites for host–guest adsorption of polychlorinated biphenyls (PCBs)

Wang

Liu²,

Wang

et al. 2015

Journal of Colloid and Interface Science

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Section: Absorption Of Fe 3 O 4 @β-Cd For Pcbsmentioning

confidence: 99%

Core–shell superparamagnetic Fe3O4@β-CD composites for host–guest adsorption of polychlorinated biphenyls (PCBs)

Wang

Liu²,

Wang

et al. 2015

Journal of Colloid and Interface Science

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“…Regardless of electromagnetic or chemical enhancement, active substrates and adsorbed analytes (mono-or multi-layers) are both necessary for producing high-quality SERS spectra. Substrate activity depends on the scale of its features (10 to 100 nm) and its morphology [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Preparation of silver colloids with improved uniformity and stable surface-enhanced Raman scattering

Wang¹,

Hu²,

Jiang³

et al. 2016

Nano Online

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Cite as: Wei Meng, Fang Hu, Xiaohong Jiang, Lude Lu. Preparation of silver colloids with improved uniformity and stable surface-enhanced Raman scattering, nano Online Silver colloids of uniform shape and size are prepared by a two-step reduction. Small silver particles form initially by the rapid reduction of silver nitrate with sodium citrate at 100°C and then grow at 92°C. The reaction processes and resulting silver colloids are characterized by transmission electron microscopy, ultraviolet-visible absorption spectrophotometry, zeta-potential measurements, and Ag+ concentration analysis. The surface-enhanced Raman scattering (SERS) activity of the silver colloids is then investigated, using crystal violet (CV) as a SERS probe. The silver colloids exhibit uniform shape and size and stable SERS activity. The average size of the silver particles is 47 nm (14% relative standard deviation), while the average sizes of the silver colloids prepared at 100°C and 92°C are 41 (30%) and 71 nm (33%), respectively.

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“…[11][12][13][14] This method has been applied successfully to the trace analysis and detection of PCBs by using nanorod arrays [15,16] and dendritic nanostructures [17] of Ag as SERS substrates. [15][16][17][18][19] Although the facts that Ag nanostructures are indicated to be ideal substrates for PCB detections using SERS method, the interaction mechanism between PCBs and silver substrates and the SERS enhancement mechanism are still not well understood, which are of substantial importance for preparing sensitive substrates for the detection of PCBs.…”

Section: Introductionmentioning

confidence: 99%

Theoretical elucidation of the origin of surface‐enhanced Raman spectra of PCB52 adsorbed on silver substrates

Pan

Lai

Wang

et al. 2014

J Raman Spectroscopy

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To better understand experimentally observed surface-enhanced Raman Scattering (SERS) of polychlorinated biphenyls (PCBs) adsorbed on nanoscaled silver substrates, a systematic theoretical study was performed by carrying out density functional theory and time-dependent density functional theory calculations. 2,2′,5,5′-tetrachlorobiphenyl (PCB52) was chosen as a model molecule of PCBs, and Ag n (n = 2, 4, 6, and 10) clusters were used to mimic active sites of substrates. Calculated normal Raman spectra of PCB52-Ag n (n = 2, 4, 6, and 10) complexes are analogical in profile to that of isolated PCB52 with only slightly enhanced intensity. In contrast, the corresponding SERS spectra calculated at adopted incident light are strongly enhanced, and the calculated enhancement factors are 10 4~1 0 5 . Thus, the experimentally observed SERS phenomenon of PCBs supported on Ag substrates should correspond to the SERS spectra rather than the normal Raman spectra. The dominant enhancement in Raman intensities origins from the charge transfer resonance enhancement between the molecule and clusters.

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

Cited by 52 publications

References 44 publications

Core–shell superparamagnetic Fe3O4@β-CD composites for host–guest adsorption of polychlorinated biphenyls (PCBs)

Core–shell superparamagnetic Fe3O4@β-CD composites for host–guest adsorption of polychlorinated biphenyls (PCBs)

Preparation of silver colloids with improved uniformity and stable surface-enhanced Raman scattering

Theoretical elucidation of the origin of surface‐enhanced Raman spectra of PCB52 adsorbed on silver substrates

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