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Surface-enhanced Raman scattering of 4-aminobenzenethiol in Ag sol: relative intensity of a1- and b2-type bands invariant against aggregation of Ag nanoparticles.
Langmuir. 2011 Apr 19; 27(8):4526-31.L

Abstract

4-Aminobenzenthiol (4-ABT) is an unusual molecule, showing variable surface-enhanced Raman scattering (SERS) spectra depending upon measurement conditions. In an effort to reduce ambiguity and add clarity, we have thus conducted an ultraviolet-visible (UV-vis) extinction measurement, along with Raman scattering measurement, after adding 4-ABT into aqueous Ag sol. Upon the addition of 4-ABT, the surface plasmon absorption band of Ag at 410 nm gradually diminished and, concomitantly, a weak and broad band developed at longer wavelengths, obviously because of the aggregation of Ag nanoparticles. At the same time, the Raman scattering peaks of 4-ABT varied in intensity as the Ag particles proceeded to form aggregates. A close examination revealed that the peak intensity of the ring 7a band of 4-ABT, a typical a(1) vibrational mode, could be correlated with the UV-vis extinction of the Ag sol measured at the excitation laser wavelength. In a separate Raman measurement conducted using sedimented Ag colloidal particles, 4-ABT was found not to be subjected to any surface-induced photoreaction, implying that all of the observable Raman peaks were, in fact, solely due to 4-ABT on Ag. The intensities of the b(2)-type bands, such as the ring 3, 9b, and 19b modes of 4-ABT, were then analyzed and found to be invariant with respect to the 7a band, irrespective of the extent of Ag aggregation as far as at a fixed excitation wavelength. The intensity ratio of the b(2)-type/7a bands would then reflect the extent of the chemical enhancement that was involved in the SERS of 4-ABT in aggregated Ag sol.

Authors+Show Affiliations

Department of Chemistry, Seoul National University, Seoul 151-742, Korea. kwankim@snu.ac.krNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21405076

Citation

Kim, Kwan, et al. "Surface-enhanced Raman Scattering of 4-aminobenzenethiol in Ag Sol: Relative Intensity of A1- and B2-type Bands Invariant Against Aggregation of Ag Nanoparticles." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 27, no. 8, 2011, pp. 4526-31.
Kim K, Yoon JK, Lee HB, et al. Surface-enhanced Raman scattering of 4-aminobenzenethiol in Ag sol: relative intensity of a1- and b2-type bands invariant against aggregation of Ag nanoparticles. Langmuir. 2011;27(8):4526-31.
Kim, K., Yoon, J. K., Lee, H. B., Shin, D., & Shin, K. S. (2011). Surface-enhanced Raman scattering of 4-aminobenzenethiol in Ag sol: relative intensity of a1- and b2-type bands invariant against aggregation of Ag nanoparticles. Langmuir : the ACS Journal of Surfaces and Colloids, 27(8), 4526-31. https://doi.org/10.1021/la200293b
Kim K, et al. Surface-enhanced Raman Scattering of 4-aminobenzenethiol in Ag Sol: Relative Intensity of A1- and B2-type Bands Invariant Against Aggregation of Ag Nanoparticles. Langmuir. 2011 Apr 19;27(8):4526-31. PubMed PMID: 21405076.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Surface-enhanced Raman scattering of 4-aminobenzenethiol in Ag sol: relative intensity of a1- and b2-type bands invariant against aggregation of Ag nanoparticles. AU - Kim,Kwan, AU - Yoon,Jae Keun, AU - Lee,Hyang Bong, AU - Shin,Dongha, AU - Shin,Kuan Soo, Y1 - 2011/03/15/ PY - 2011/3/17/entrez PY - 2011/3/17/pubmed PY - 2011/8/30/medline SP - 4526 EP - 31 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 27 IS - 8 N2 - 4-Aminobenzenthiol (4-ABT) is an unusual molecule, showing variable surface-enhanced Raman scattering (SERS) spectra depending upon measurement conditions. In an effort to reduce ambiguity and add clarity, we have thus conducted an ultraviolet-visible (UV-vis) extinction measurement, along with Raman scattering measurement, after adding 4-ABT into aqueous Ag sol. Upon the addition of 4-ABT, the surface plasmon absorption band of Ag at 410 nm gradually diminished and, concomitantly, a weak and broad band developed at longer wavelengths, obviously because of the aggregation of Ag nanoparticles. At the same time, the Raman scattering peaks of 4-ABT varied in intensity as the Ag particles proceeded to form aggregates. A close examination revealed that the peak intensity of the ring 7a band of 4-ABT, a typical a(1) vibrational mode, could be correlated with the UV-vis extinction of the Ag sol measured at the excitation laser wavelength. In a separate Raman measurement conducted using sedimented Ag colloidal particles, 4-ABT was found not to be subjected to any surface-induced photoreaction, implying that all of the observable Raman peaks were, in fact, solely due to 4-ABT on Ag. The intensities of the b(2)-type bands, such as the ring 3, 9b, and 19b modes of 4-ABT, were then analyzed and found to be invariant with respect to the 7a band, irrespective of the extent of Ag aggregation as far as at a fixed excitation wavelength. The intensity ratio of the b(2)-type/7a bands would then reflect the extent of the chemical enhancement that was involved in the SERS of 4-ABT in aggregated Ag sol. SN - 1520-5827 UR - https://www.unboundmedicine.com/medline/citation/21405076/Surface_enhanced_Raman_scattering_of_4_aminobenzenethiol_in_Ag_sol:_relative_intensity_of_a1__and_b2_type_bands_invariant_against_aggregation_of_Ag_nanoparticles_ L2 - https://doi.org/10.1021/la200293b DB - PRIME DP - Unbound Medicine ER -