Charge-Transfer Induced Surface-Enhanced Raman Scattering in Silver Nanoparticle Assemblies

Zhou, Qun; Zhao, Gui; Chao, Yanwen; Li, Yan; Zheng, Junwei

doi:10.1021/jp067045s

Cited by 81 publications

(89 citation statements)

References 25 publications

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“…are frequently studied as SERS probe molecules [19,20] and particularly 4-ABT is widely used as molecular junction [21,22] and building block in SAMs [21,23] [24,25] or when applying high enough electrode potentials [26,27]. However, SERS spectra from benzenethiol on these metals are substantially the same as the normal Raman spectrum.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Spectroelectrochemical behavior of 4-aminobenzenethiol on nanostructured platinum and silver electrodes

Vidal‐Iglesias¹,

Solla-Gullón²,

Rodes³

et al. 2015

Surface Science

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The adsorption of 4-aminobenzenethiol (4-ABT) on Ag and Pt nanoparticles is studied by spectroelectrochemical means (cyclic voltammetry, Surface-Enhanced Raman Spectroscopy (SERS) and Surface-Enhanced Infrared Reflection Absorption Spectroscopy (SEIRAS). Similar SERS spectra are obtained when 4-ABT is adsorbed on platinum and silver nanostructured substrates. In addition, unless a low power density of the laser is used, these spectra show, both under open circuit conditions and when applying electrode potentials above -0.50 V, bands not observed in the normal Raman spectrum of 4-ABT. These bands disappear when the electrode potential is shifted to more negative values. Conversely, the SEIRA spectra of 4-ABT adsorbed on Ag do not show any significant change with the electrode potential, which indicates that there are not new species electrochemically formed in the range of potentials considered, which include some anodic and cathodic processes as shown in the corresponding cyclic voltammograms. In this regard, SERS measurements put in evidence the time dependence of the spectra obtained at potentials above -0.50 V just after switching on the laser suggesting the formation of new species, probably dimercaptoazobenzene (4-4'-DMAB), formed by a photochemical process of the adsorbed 4-ABT.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Spectroelectrochemical behavior of 4-aminobenzenethiol on nanostructured platinum and silver electrodes

Vidal‐Iglesias¹,

Solla-Gullón²,

Rodes³

et al. 2015

Surface Science

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show abstract

“…This means that electromagnetic "hot spots" had formed at the gaps between pairs of Au nanoparticles. [48][49][50][51][52][53] The Raman signal did not increase further, however, even after the adsorption of additional 1,4-PDI onto the vacant surfaces of the second Au nanoparticles. As a rough estimate, about 400 molecules residing only within a 10-nm diameter area of the center of the gap, adsorbed in the first stage, have thus contributed most of the measured Raman signal of 1,4-PDI.…”

Section: ·4 Size Of "Hot Spots"mentioning

confidence: 99%

Surface-Enhanced Raman Scattering: A Powerful Tool for Chemical Identification

Kim

Shin

2011

ANAL. SCI.

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“…cm -1 , 1390 cm -1 and 1432 cm -1 ) are also present under open circuit conditions 20,28 or when applying high enough electrode potentials. 24,32 However, SERS spectra from benzenethiol on these metals are substantially similar to those obtained from the normal Raman spectrum.…”

mentioning

confidence: 94%

“…Since then, many papers have been published, and the three strongly enhanced Raman peaks have been widely considered as an experimental evidence of a chemical mechanism of SERS. [20][21][28][29][30][31] Alternatively, it has been also proposed, based on the spectral similarity of 4-ABT and 4,4'-dimercaptoazobenzene (4,4'-DMAB) adsorbed on Ag, that these bands correspond to N=N stretching (a g symmetric vibrational modes) of 4,4'-DMAB produced from 4-ABT via a photocatalytic coupling reaction. 24,32 Recently, similar SERS spectra have been obtained when 4-ABT was adsorbed on nanostructured Pt substrates.…”

mentioning

confidence: 99%

Spectroelectrochemical Study of the Photoinduced Catalytic Formation of 4,4′-Dimercaptoazobenzene from 4-Aminobenzenethiol Adsorbed on Nanostructured Copper

et al. 2015

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 type and power density of the laser. SERS spectra showed the formation of the 4,4'-DMAB on the nanostructured Cu surface independently of the laser employed. For the sake of comparison SERS spectra of a self-assembled monolayer of the 4-ABT on Ag surfaces decorated with Ag nanostructures have been also obtained with the same four lasers. When using the 532 nm and 632.8 nm lasers, the 4,4'-DMAB is formed on Cu surface at electrode potentials as low as -1.0 V (AgCl/Ag) showing a different behaviour with respect to Ag (and others metals such as Au and Pt). On the other hand, the Surface-Enhanced Infrared Reflection Absorption (SEIRA) spectra showed that in absence of the laser excitation the 4,4'-DMAB is not produced from the adsorbed 4-ABT on nanostructured Cu in the whole range of potentials studied. These results point out the prevalence of the role of electron-hole pairs through surface plasmon activity to explain the obtained SERS spectra.

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Charge-Transfer Induced Surface-Enhanced Raman Scattering in Silver Nanoparticle Assemblies

Cited by 81 publications

References 25 publications

Spectroelectrochemical behavior of 4-aminobenzenethiol on nanostructured platinum and silver electrodes

Spectroelectrochemical behavior of 4-aminobenzenethiol on nanostructured platinum and silver electrodes

Surface-Enhanced Raman Scattering: A Powerful Tool for Chemical Identification

Spectroelectrochemical Study of the Photoinduced Catalytic Formation of 4,4′-Dimercaptoazobenzene from 4-Aminobenzenethiol Adsorbed on Nanostructured Copper

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