SERS study on the aggregation mechanisms resulting from the orientation of dipyridinic derivatives on gold nanoparticles

Rodrigo Sánchez-González, Viviana Silva, Constanza Suazo, Juan Pablo Soto, Santiago Sanchez-Cortes, Marcelo Campos-Vallette, Patricio Leyton, Elizabeth Imbarack

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, was studied the adsorption and orientation of three dipyridinic derivatives 9,10-bis-((E)-2-(pyridin-4-yl)vinyl)anthracene (DPAC), 1,4-bis-((E)-2-(pyridin-4-yl)vinyl)naphthalene (DPNA-T) and 2,6-bis-((E)-2-(pyridin-4-yl)vinyl)naphthalene (DPNA-L) on gold nanoparticles, using Surface Enhanced Raman Scattering (SERS). Systematic modification in the shapes of the bifunctional systems (Cross-shape, T-shape and Linear-shape) shows changes significant in the preferential orientation of these analytes on the nanostructured gold surface. Additional data from UV–vis measurements and TEM images are in agreement with the Reaction Limited Colloid Aggregation (RLCA) mechanisms for DPAC and DPNA-T and Diffusion Limited Colloid Aggregation (DLCA) mechanisms for DPNA-L, showing that for the same analyte concentration, the aggregation mechanism depends on the molecular shape. These results allow us to rationalize the fundamental aspects involved in the development of devices based on plasmonic resonance with potential applications in the field of molecular electronics.

Original languageEnglish
Article number120286
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume264
DOIs
StatePublished - 5 Jan 2022
Externally publishedYes

Keywords

  • Dipyridinic compounds
  • DLCA
  • Gold nanoparticles
  • RLCA
  • SERS

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