title: Surface enhanced Raman scattering of amino acids assisted by gold nanoparticles and Gd(3+) ions.
abstract: The surface enhanced raman scattering (SERS) signal from the l-tyrosine (tyr) molecule adsorbed on gold nanoparticles (Au-tyr) is compared with the SERS signal assisted by the presence of gadolinium ions (Gd(3+)) coordinated with the Au-tyr system. An enhancement factor of the SERS signal in the presence of Gd(3+) ions was ∼5 times higher than that produced by l-tyrosine adsorbed on gold nanoparticles. The enhancement of the SERS signal can be attributed to a corresponding increase in the local electric field due to the presence of Gd(3+) ions in the vicinity of a gold dimer configuration. This scenario was confirmed by solving numerically Maxwell equations, showing an increase of 1 order of magnitude in the local electric scattered field when the Gd(3+) ion is located in between a gold dimer compared with naked gold nanoparticles.
authors: †Doctorado en Ciencias Aplicadas, Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #6, Zona Universitaria, 78290, San Luis Potosí, México.
authors: Juan Pablo
authors: JP
authors: López-Neira
authors: ‡Doctorado en Ciencia de Materiales, Instituto de Física, Universidad Autónoma de Puebla, 72570, Puebla, México.
authors: José Mario
authors: JM
authors: Galicia-Hernández
authors: §Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Av. Universidad #3000, México D.F., 04510, México.
authors: Alejandro
authors: A
authors: Reyes-Coronado
authors: ∥Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #6, Zona Universitaria, 78290, San Luis Potosí, México.
authors: Elías
authors: E
authors: Pérez
authors: ⊥Consejo Nacional de Ciencia y Tecnología (CONACyT), Av. Insurgentes Sur 1582, Col. Crédito Constructor, Del. Benito Juárez, 03940, México D.F., México.
authors: Francisco
authors: F
authors: Castillo-Rivera
mesh_terms: D005682:Gadolinium / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014443:Tyrosine / Q000737:chemistry*
chemical_list: D007477:Ions; D014443:Tyrosine; D006046:Gold; D005682:Gadolinium