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Surface-enhanced Raman scattering characteristics of nanogaps formed by a flat Ag substrate and spherical Pt nanoparticles.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Jan 01; 100:10-4.SA

Abstract

We estimated the apparent size of the 'hot site' for surface-enhanced Raman scattering (SERS) located within the gaps between Pt nanoparticles and a flat Ag substrate. Initially, no Raman peaks were detected for 4-aminobenzenethiol (4-ABT) on a flat Ag substrate. Upon attaching 68 nm-sized Pt nanoparticles onto the amine group of 4-ABT (thus denoted as Pt-4-ABT/Ag(flat)), Raman peaks were distinctly observed, not only with the excitation at 488 nm but also with the excitation at 632.8 nm. This means that electromagnetic 'hot site' had formed at the gaps between Pt nanoparticles and a flat Ag substrate. When 4-ABT molecules were adsorbed additionally onto the vacant sites of Pt nanoparticles in Pt-4-ABT/Ag(flat), the Raman signal did not increase further, suggesting that the SERS 'hot site' was very limited and located mostly at the gaps between Pt nanoparticles and a flat Ag substrate, in agreement with the finite-difference time-domain (FDTD) calculation. To a rough estimate, about 1000 molecules residing only within a ~15 nm diameter area of the center of the gap must have contributed most of the measured Raman signal of 4-ABT.

Authors+Show Affiliations

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

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22325486

Citation

Kim, Kwan, et al. "Surface-enhanced Raman Scattering Characteristics of Nanogaps Formed By a Flat Ag Substrate and Spherical Pt Nanoparticles." Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, vol. 100, 2013, pp. 10-4.
Kim K, Lee HB, Shin KS. Surface-enhanced Raman scattering characteristics of nanogaps formed by a flat Ag substrate and spherical Pt nanoparticles. Spectrochim Acta A Mol Biomol Spectrosc. 2013;100:10-4.
Kim, K., Lee, H. B., & Shin, K. S. (2013). Surface-enhanced Raman scattering characteristics of nanogaps formed by a flat Ag substrate and spherical Pt nanoparticles. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, 100, 10-4. https://doi.org/10.1016/j.saa.2012.01.049
Kim K, Lee HB, Shin KS. Surface-enhanced Raman Scattering Characteristics of Nanogaps Formed By a Flat Ag Substrate and Spherical Pt Nanoparticles. Spectrochim Acta A Mol Biomol Spectrosc. 2013 Jan 1;100:10-4. PubMed PMID: 22325486.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Surface-enhanced Raman scattering characteristics of nanogaps formed by a flat Ag substrate and spherical Pt nanoparticles. AU - Kim,Kwan, AU - Lee,Hyang Bong, AU - Shin,Kuan Soo, Y1 - 2012/01/27/ PY - 2011/10/26/received PY - 2011/12/29/revised PY - 2012/01/18/accepted PY - 2012/2/14/entrez PY - 2012/2/14/pubmed PY - 2013/5/2/medline SP - 10 EP - 4 JF - Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy JO - Spectrochim Acta A Mol Biomol Spectrosc VL - 100 N2 - We estimated the apparent size of the 'hot site' for surface-enhanced Raman scattering (SERS) located within the gaps between Pt nanoparticles and a flat Ag substrate. Initially, no Raman peaks were detected for 4-aminobenzenethiol (4-ABT) on a flat Ag substrate. Upon attaching 68 nm-sized Pt nanoparticles onto the amine group of 4-ABT (thus denoted as Pt-4-ABT/Ag(flat)), Raman peaks were distinctly observed, not only with the excitation at 488 nm but also with the excitation at 632.8 nm. This means that electromagnetic 'hot site' had formed at the gaps between Pt nanoparticles and a flat Ag substrate. When 4-ABT molecules were adsorbed additionally onto the vacant sites of Pt nanoparticles in Pt-4-ABT/Ag(flat), the Raman signal did not increase further, suggesting that the SERS 'hot site' was very limited and located mostly at the gaps between Pt nanoparticles and a flat Ag substrate, in agreement with the finite-difference time-domain (FDTD) calculation. To a rough estimate, about 1000 molecules residing only within a ~15 nm diameter area of the center of the gap must have contributed most of the measured Raman signal of 4-ABT. SN - 1873-3557 UR - https://www.unboundmedicine.com/medline/citation/22325486/Surface_enhanced_Raman_scattering_characteristics_of_nanogaps_formed_by_a_flat_Ag_substrate_and_spherical_Pt_nanoparticles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1386-1425(12)00062-5 DB - PRIME DP - Unbound Medicine ER -