Photon-driven charge transfer and photocatalysis of p-aminothiophenol in metal nanogaps: a DFT study of SERS

Wu, De‐Yin; Zhao, Liu−Bin; Liu, Xiumin; Huang, Rong; Huang, Yifan; Ren, Bin; Zhang, Tian

doi:10.1039/c0cc05302c

Cited by 145 publications

(149 citation statements)

References 23 publications

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“…on Cu NPs excited by near-infrared 1064-nm excitation. Hence, the FT-SERS spectroscopy on Cu NPs reduces the risk of photocatalytic processes observed on gold and silver surfaces excited in the visible region (at 632.8 nm by Canpean) [34] and predicted by calculation (at 632.8 and 785 nm) of Wu et al [35,36] . Furthermore, the spectra are repeatable within several hours without observation of any new band, indicating stable adsorption of 4-ABT that inhibits the oxidation of the Cu NP surface.…”

Section: Ef Of Colloidal Systemmentioning

confidence: 99%

Comparison of SERS effectiveness of copper substrates prepared by different methods: what are the values of enhancement factors?

Dendisová

Prokopec

Člupek

et al. 2011

J Raman Spectroscopy

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Surface-enhanced Raman scattering (SERS) spectroscopy is an analytical method for the detection of low amounts of analytes adsorbed on an appropriate coinage metal (Au, Ag, Cu) surface. Generally, the values of the enhancement factor are the highest on silver, lower on gold and relatively very low on copper. In this study, we have focused on the estimation of the enhancement factors of copper surface/substrates formed by different preparation procedures. The SERS activity of large electrochemically prepared substrates and colloidal systems is compared. The surface morphology of the large substrates was studied using scanning electron microscopy and atomic force microscopy. The size distribution of colloidal nanoparticles was monitored by dynamic light scattering. The values of enhancement factor are in both cases more than 10 5 for the FT-SERS spectra, demonstrating the fundamental role of nanostructured copper as a substrate material at the excitation wavelength (1064 nm) used.

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Section: Ef Of Colloidal Systemmentioning

confidence: 99%

Comparison of SERS effectiveness of copper substrates prepared by different methods: what are the values of enhancement factors?

Dendisová

Prokopec

Člupek

et al. 2011

J Raman Spectroscopy

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“…The two Raman peaks 1,077 and 1,590 cm −1 arise from the adsorbed PATP molecules, whereas the Raman peaks at 1,143, 1,391, and 1,436 cm −1 arise from the newlyproduced p,p′-dimercaptoazobenzene molecules. 48,49 Therefore, we can conclude that the vancomycin layer is porous. In addition, the SERS enhancement factor (EF) determined based on the peak intensity at 1,077 cm −1 was estimated to be 1.61×10 5 …”

Section: Synthetic Strategy For Vancomycin Modification and Charactermentioning

confidence: 97%

Combined use of vancomycin-modified Ag-coated magnetic nanoparticles and secondary enhanced nanoparticles for rapid surface-enhanced Raman scattering detection of bacteria

Wang¹,

Liu³

et al. 2018

IJN

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Background Pathogenic bacteria have always been a significant threat to human health. The detection of pathogens needs to be rapid, accurate, and convenient. Methods We present a sensitive surface-enhanced Raman scattering (SERS) biosensor based on the combination of vancomycin-modified Ag-coated magnetic nanoparticles (Fe 3 O 4 @Ag-Van MNPs) and Au@Ag nanoparticles (NPs) that can effectively capture and discriminate bacterial pathogens from solution. The high-performance Fe 3 O 4 @Ag MNPs were modified with vancomycin and used as bacteria capturer for magnetic separation and enrichment. The modified MNPS were found to exhibit strong affinity with a broad range of Gram-positive and Gram-negative bacteria. After separating and rinsing bacteria, Fe 3 O 4 @Ag-Van MNPs and Au@Ag NPs were synergistically used to construct a very large number of hot spots on bacteria cells, leading to ultrasensitive SERS detection. Results The dominant merits of our dual enhanced strategy included high bacterial-capture efficiency (>65%) within a wide pH range (pH 3.0–11.0), a short assay time (<30 min), and a low detection limit (5×10 2 cells/mL). Moreover, the spiked tests show that this method is still valid in milk and blood samples. Owing to these capabilities, the combined system enabled the sensitive and specific discrimination of different pathogens in complex solution, as verified by its detection of Gram-positive bacterium Escherichia coli , Gram-positive bacterium Staphylococcus aureus , and methicillin-resistant S. aureus . Conclusion This method has great potential for field applications in food safety, environmental monitoring, and infectious disease diagnosis.

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“…Since nanogap between two metallic nanostructures has been demonstrated to concentrate an incident electromagnetic fi eld into a small space, providing strong fi eld localization, [1][2][3] this small metallic gap has been attracted particular attention for a wide variety of applications ranging from photovoltaics, [ 4 ] photocatalysis, [ 5 ] metamaterials, [ 6 ] surface-enhanced spectroscopy, [ 7 ] and molecular sensing. [ 8 ] To date, metallic nanogaps have been prepared by several sophisticated lithographic methods.…”

Section: Shows Photographs Andmentioning

confidence: 99%

Facile Preparation of Ultrasmall Void Metallic Nanogap from Self‐Assembled Gold–Silica Core–Shell Nanoparticles Monolayer via Kinetic Control

et al. 2015

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A facile preparation of ultrasmall 1-2 nm void metallic nanogaps on various solid substrates is proposed by utilizing the self-assembly of a uniform gold-silica core-shell nanoparticle monolayer at interfaces and chemical etching. The ultrasmall void metallic nanogap shows key advantages such as a strong near-field enhancement and free diffusion of analytes to the gap, which are useful in molecular sensing and monitoring.

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Photon-driven charge transfer and photocatalysis of p-aminothiophenol in metal nanogaps: a DFT study of SERS

Cited by 145 publications

References 23 publications

Comparison of SERS effectiveness of copper substrates prepared by different methods: what are the values of enhancement factors?

Comparison of SERS effectiveness of copper substrates prepared by different methods: what are the values of enhancement factors?

Combined use of vancomycin-modified Ag-coated magnetic nanoparticles and secondary enhanced nanoparticles for rapid surface-enhanced Raman scattering detection of bacteria

Facile Preparation of Ultrasmall Void Metallic Nanogap from Self‐Assembled Gold–Silica Core–Shell Nanoparticles Monolayer via Kinetic Control

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