Surface enhanced raman scattering of amino acids assisted by gold nanoparticles and Gd3%2b ions Article uri icon

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 (Gd3%2b) coordinated with the Au-tyr system. An enhancement factor of the SERS signal in the presence of Gd3%2b 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 Gd3%2b 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 Gd3%2b ion is located in between a gold dimer compared with naked gold nanoparticles. © 2015 American Chemical Society.

publication date

  • 2015-01-01