SERS study of the behavior of Oligophenyleneimine and Dithiolated in Au surfaces

• Grant number: 11/17923-9
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: December 01, 2011
• End date: February 27, 2016
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Marcia Laudelina Arruda Temperini
• Grantee: Klester dos Santos Souza
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 06/58748-7 - Reactivity, dynamics and spectroscopy of complex systems, AP.TEM

Abstract

Thirty-eight years after discovering the SERS effect, this technique has been used in different fields such as bioscience and nanoscience. Nonetheless several fundamental issues about the enhancement mechanisms still need to be fully understood. In order to obtain further comprehension on the nature of the enhancement we will investigate the SERS behavior of molecular wires such as oligophenyleneimine (OPI) and dithiolates adsorbed on Au substrates. We will determine the role of size and nature of the oligophenyleneimine and dithiolates molecular units on the SERS enhancement by means of the enhancement factor (EF) determination. The effect of morphology and organization of Au substrate on the resulting SERS EF) will be determined. Deep insight on the enhancement intensity generated by the "hot spots", structures like Au(substrate)|molecular-wire|Au-nanoparticles will be synthesized and the SERS EF will be measured. The results will provide a better understanding of the factors that govern the enhancement of the Raman signal of the molecular wire at the metal surface as well as a better characterization of the molecular wires studied.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SOUZA, KLESTER S.; TEIXEIRA-NETO, ERICO; TEMPERINI, MARCIA L. A.; DOS SANTOS, DIEGO P.. Interplay between Near-Field Properties and Au Nanorod Cluster Structure: Extending Hot Spots for Surface-Enhanced Raman Scattering. Journal of the Brazilian Chemical Society, v. 30, n. 12, SI, p. 2624-2633, DEC 2019. (16/21070-5, 11/17923-9)

SOUZA, KLESTER S.; DOS SANTOS, DIEGO P.; ANDRADE, GUSTAVO F. S.; PEREIRA, MARCELO B.; TEIXEIRA-NETO, ERICO; TEMPERINI, MARCIA L. A.. Molecular Wires Bridging Gaps between Gold Surfaces and Their Influence on SERS Intensities. Journal of Physical Chemistry C, v. 121, n. 38, p. 20937-20946, SEP 28 2017. (12/13119-3, 11/17923-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SOUZA, Klester dos Santos. Molecular junctions and gold nanorods aggregates: SERS study. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) São Paulo.