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Raman scattering of 4-aminobenzenethiol sandwiched between Ag/Au nanoparticle and macroscopically smooth Au substrate.
J Phys Chem B. 2005 Nov 10; 109(44):20731-6.JP

Abstract

Raman scattering measurements were conducted for a 4-aminobenzenethiol (4-ABT) monolayer assembled on a macroscopically smooth Au substrate. Although no peak was detected at the beginning, Raman peaks were distinctly observed by attaching Ag or Au nanoparticles onto the 4-ABT monolayer (Ag(Au)@4-ABT/Au(flat)). Considering the fact that no Raman signal is observed when Ag (Au) nanoparticles are adsorbed on a (4-aminophenyl)silane monolayer assembled on a silicon wafer, the Raman spectrum observed for Ag(Au)@4-ABT/Au(flat) must be a surface-enhanced Raman scattering (SERS) spectrum, derived from the electromagnetic coupling of the localized surface plasmon of Ag (Au) nanoparticles with the surface plasmon polariton of the underneath Au metal. The electromagnetic coupling responsible for SERS appeared to be governed more by the bulk Au substrate than the sparsely distributed Ag or Au nanoparticles. The chemical enhancement appeared on the other hand to be derived more from the formation of Au-S bonds than any charge-transfer interaction between the protonated amine group and the Au or Ag nanoparticles. The enhancement factors derived from the attachment of a single Ag or Au nanoparticle onto 4-ABT on Au were estimated to be as large as 8.3 x 10(5) and 5.0 x 10(5), respectively, (for the ring 3 band (b(2)) near 1390 cm(-1)) in which a factor of approximately 10(2) was presumed to be due to the chemical effect, with the remaining contributed by the electromagnetic effect.

Authors+Show Affiliations

Laboratory of Intelligent Interfaces, School of Chemistry, Seoul National University, Seoul 151-742, Korea. kwankim@snu.ac.krNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16853687

Citation

Kim, Kwan, and Jae Keun Yoon. "Raman Scattering of 4-aminobenzenethiol Sandwiched Between Ag/Au Nanoparticle and Macroscopically Smooth Au Substrate." The Journal of Physical Chemistry. B, vol. 109, no. 44, 2005, pp. 20731-6.
Kim K, Yoon JK. Raman scattering of 4-aminobenzenethiol sandwiched between Ag/Au nanoparticle and macroscopically smooth Au substrate. J Phys Chem B. 2005;109(44):20731-6.
Kim, K., & Yoon, J. K. (2005). Raman scattering of 4-aminobenzenethiol sandwiched between Ag/Au nanoparticle and macroscopically smooth Au substrate. The Journal of Physical Chemistry. B, 109(44), 20731-6.
Kim K, Yoon JK. Raman Scattering of 4-aminobenzenethiol Sandwiched Between Ag/Au Nanoparticle and Macroscopically Smooth Au Substrate. J Phys Chem B. 2005 Nov 10;109(44):20731-6. PubMed PMID: 16853687.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Raman scattering of 4-aminobenzenethiol sandwiched between Ag/Au nanoparticle and macroscopically smooth Au substrate. AU - Kim,Kwan, AU - Yoon,Jae Keun, PY - 2006/7/21/pubmed PY - 2006/7/21/medline PY - 2006/7/21/entrez SP - 20731 EP - 6 JF - The journal of physical chemistry. B JO - J Phys Chem B VL - 109 IS - 44 N2 - Raman scattering measurements were conducted for a 4-aminobenzenethiol (4-ABT) monolayer assembled on a macroscopically smooth Au substrate. Although no peak was detected at the beginning, Raman peaks were distinctly observed by attaching Ag or Au nanoparticles onto the 4-ABT monolayer (Ag(Au)@4-ABT/Au(flat)). Considering the fact that no Raman signal is observed when Ag (Au) nanoparticles are adsorbed on a (4-aminophenyl)silane monolayer assembled on a silicon wafer, the Raman spectrum observed for Ag(Au)@4-ABT/Au(flat) must be a surface-enhanced Raman scattering (SERS) spectrum, derived from the electromagnetic coupling of the localized surface plasmon of Ag (Au) nanoparticles with the surface plasmon polariton of the underneath Au metal. The electromagnetic coupling responsible for SERS appeared to be governed more by the bulk Au substrate than the sparsely distributed Ag or Au nanoparticles. The chemical enhancement appeared on the other hand to be derived more from the formation of Au-S bonds than any charge-transfer interaction between the protonated amine group and the Au or Ag nanoparticles. The enhancement factors derived from the attachment of a single Ag or Au nanoparticle onto 4-ABT on Au were estimated to be as large as 8.3 x 10(5) and 5.0 x 10(5), respectively, (for the ring 3 band (b(2)) near 1390 cm(-1)) in which a factor of approximately 10(2) was presumed to be due to the chemical effect, with the remaining contributed by the electromagnetic effect. SN - 1520-6106 UR - https://www.unboundmedicine.com/medline/citation/16853687/Raman_scattering_of_4_aminobenzenethiol_sandwiched_between_Ag/Au_nanoparticle_and_macroscopically_smooth_Au_substrate_ L2 - https://doi.org/10.1021/jp052829b DB - PRIME DP - Unbound Medicine ER -
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