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Surface-enhanced raman scattering on dendrimer/metallic nanoparticle layer-by-layer film substrates.
Langmuir. 2005 Jun 07; 21(12):5576-81.L

Abstract

In this paper, the fabrication, characterization, and application of unique layer-by-layer (LBL) films of dendrimers and metallic nanoparticles is reported. Silver nanoparticles (d = approximately 20 nm) are produced in solution by sodium citrate reduction and incorporated into thin films with generation 1 and 5 DAB-Am dendrimers (polypropylenimine dendrimers with amino surface groups) by the LBL technique. The resulting nanocomposite films are characterized by UV-visible surface plasmon absorption and atomic force microscopy (AFM) measurements, and employed as substrates for surface-enhanced Raman scattering (SERS) of 2-naphthalenethiol. Through variation of the molecular size (dendrimer generation) and concentration of the cross-linker used, as well as the number of layers produced, the optical properties of several different possible architectures are studied. In the films, Ag nanoparticles are shown to be effectively immobilized and stabilized with increased control over their spacing and aggregation. Moreover, the films are shown to be excellent substrates for SERS measurements, demonstrating significant enhancement capability. As expected, large electromagnetic enhancement of Raman scattering signals is found to be strongly dependent on interparticle coupling between neighboring metallic nanoparticles. Finally, the possibility of detecting SERS signals from architectures with intervening layers between the metal nanoparticles and analyte molecules is explored. It is shown that although there are decreases in intensity with increasing number of intervening layers (as is expected from the distance dependence of SERS), electromagnetic enhancement is still able to function at these distances, thus offering the possibility of developing sensors with external layers that are chemically selective for specific analytes.

Authors+Show Affiliations

Materials & Surface Science Group, School of Physical Sciences, University of Windsor, Windsor, Ontario, Canada N9B 3P4.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15924492

Citation

Goulet, Paul J G., et al. "Surface-enhanced Raman Scattering On Dendrimer/metallic Nanoparticle Layer-by-layer Film Substrates." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 21, no. 12, 2005, pp. 5576-81.
Goulet PJ, dos Santos DS, Alvarez-Puebla RA, et al. Surface-enhanced raman scattering on dendrimer/metallic nanoparticle layer-by-layer film substrates. Langmuir. 2005;21(12):5576-81.
Goulet, P. J., dos Santos, D. S., Alvarez-Puebla, R. A., Oliveira, O. N., & Aroca, R. F. (2005). Surface-enhanced raman scattering on dendrimer/metallic nanoparticle layer-by-layer film substrates. Langmuir : the ACS Journal of Surfaces and Colloids, 21(12), 5576-81.
Goulet PJ, et al. Surface-enhanced Raman Scattering On Dendrimer/metallic Nanoparticle Layer-by-layer Film Substrates. Langmuir. 2005 Jun 7;21(12):5576-81. PubMed PMID: 15924492.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Surface-enhanced raman scattering on dendrimer/metallic nanoparticle layer-by-layer film substrates. AU - Goulet,Paul J G, AU - dos Santos,David S,Jr AU - Alvarez-Puebla,Ramón A, AU - Oliveira,Osvaldo N,Jr AU - Aroca,Ricardo F, PY - 2005/6/1/pubmed PY - 2005/6/1/medline PY - 2005/6/1/entrez SP - 5576 EP - 81 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 21 IS - 12 N2 - In this paper, the fabrication, characterization, and application of unique layer-by-layer (LBL) films of dendrimers and metallic nanoparticles is reported. Silver nanoparticles (d = approximately 20 nm) are produced in solution by sodium citrate reduction and incorporated into thin films with generation 1 and 5 DAB-Am dendrimers (polypropylenimine dendrimers with amino surface groups) by the LBL technique. The resulting nanocomposite films are characterized by UV-visible surface plasmon absorption and atomic force microscopy (AFM) measurements, and employed as substrates for surface-enhanced Raman scattering (SERS) of 2-naphthalenethiol. Through variation of the molecular size (dendrimer generation) and concentration of the cross-linker used, as well as the number of layers produced, the optical properties of several different possible architectures are studied. In the films, Ag nanoparticles are shown to be effectively immobilized and stabilized with increased control over their spacing and aggregation. Moreover, the films are shown to be excellent substrates for SERS measurements, demonstrating significant enhancement capability. As expected, large electromagnetic enhancement of Raman scattering signals is found to be strongly dependent on interparticle coupling between neighboring metallic nanoparticles. Finally, the possibility of detecting SERS signals from architectures with intervening layers between the metal nanoparticles and analyte molecules is explored. It is shown that although there are decreases in intensity with increasing number of intervening layers (as is expected from the distance dependence of SERS), electromagnetic enhancement is still able to function at these distances, thus offering the possibility of developing sensors with external layers that are chemically selective for specific analytes. SN - 0743-7463 UR - https://www.unboundmedicine.com/medline/citation/15924492/Surface_enhanced_raman_scattering_on_dendrimer/metallic_nanoparticle_layer_by_layer_film_substrates_ L2 - https://doi.org/10.1021/la050202e DB - PRIME DP - Unbound Medicine ER -
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