SELF-ASSEMBLED MONOLAYERS OF SULFUR COMPOUNDS: A SPECTROSCOPY STUDY

• Grant number: 11/12479-3
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: November 01, 2011
• End date: October 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Marcia Laudelina Arruda Temperini
• Grantee: Tercio de Freitas Paulo
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The aim of this proposal is to use SERS (Surface-Enhanced Raman Scattering) spectroscopy on the investigation of the spontaneous phenomenon of adsorption (Self-Assembled Monolayer - SAM) of sulfur containing compounds on activated SERS substrate of gold (Au/SAM) and with gold nanoparticles (Au/SAM/AuNP). Structural information on the SAMs formed with organic sulfur molecules and with mono and polinuclear coordination compounds (complexes of Ru and/or Fe) will be acquired. Due to the charge transfer properties of some these compounds, these species can be considered as molecular wires. Therefore, based on the in situ SERS spectra (with applied potential), we intend to contribute to a better understanding of the electron transfer in molecular wires. It will be studied, also, the dependence of the SERS enhancement effect (EF) on the distance to the electrode, on the nature of the compounds and on the presence of nanoparticles. In addition, there is the intention to study SERS in the single molecule regime.

Scientific publications

(4)

(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)

PAULO, TERCIO DE F.; DE SOUSA, TICYANO P.; DE ABREU, DIERIC S.; FELICIO, NATHALIE H.; BERNHARDT, PAUL V.; LOPES, LUIZ G. DE F.; SOUSA, EDUARDO H. S.; DIOGENES, IZAURA C. N.. Electrochemistry, Surface Plasmon Resonance, and Quartz Crystal Microbalance: An Associative Study on Cytochrome c Adsorption on Pyridine Tail-Group Monolayers on Gold. Journal of Physical Chemistry B, v. 117, n. 29, p. 8673-8680, JUL 25 2013. (11/12479-3)

ABREU, DIERIC DOS SANTOS; PAULO, TERCIO DE F.; TEMPERINI, MARCIA L. A.; DIOGENES, IZAURA C. N.. Electrochemical, surface enhanced Raman scattering and surface plasmon resonance investigations on the coordination of cyanopyridine to ruthenium on surface. Electrochimica Acta, v. 122, n. SI, p. 204-209, MAR 10 2014. (11/12479-3)

PAULO, TERCIO DE F.; ANDO, ROMULO A.; DIOGENES, IZAURA C. N.; TEMPERINI, MARICA L. A.. Understanding the Equilibria of Thio Compounds Adsorbed on Gold by Surface-Enhanced Raman Scattering and Density Functional Theory Calculations. Journal of Physical Chemistry C, v. 117, n. 12, p. 6275-6283, MAR 28 2013. (11/12479-3)

ABREU, DIERIC DOS SANTOS; PAULO, TERCIO DE F.; TEMPERINI, MARCIA L. A.; DIOGENES, IZAURA C. N.. Electrochemical, surface enhanced Raman scattering and surface plasmon resonance investigations on the coordination of cyanopyridine to ruthenium on surface. Electrochimica Acta, v. 122, p. 6-pg., 2014-03-10. (11/12479-3)