Aplicação da ressonancia de plasmon de superficie e da microbalança de cristal de quartzo na investigação de processos interfaciais visando o desenvolvimento de sensores / Applications of surface plasmon resonance and quartz crystal microbalance in the investigation of interface processes intending the sensors development

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The present work describes the applications of surface plasmon resonance (SPR) and quartz crystal microbalance (QCM) in the investigation of interface processes in the attempt to improve the understanding and application of the investigated systems as well as the establishment of the applications of the SPR allied with electrochemical techniques. In this sense, are presented the investigation of the electrochemical behavior of the methylene blue molecule (system 1), conducting polymers (system 2) and self-assembled monolayers (system 3). The selection of these systems, although distinct, has a focus on the exploration of the SPR technique in the investigation of surface and interface processes. The use of SPR technique in the investigation of the system 1 shows its applicability in the monitoring of swelling of films in nanometric size as well as the investigation of adsorptive and diffusional processes with high sensitivity. Thus, SPR was applied in the investigation of construction of thin conducting polymer films as well as its doping processes. In this sense, were investigated pyrrole and aniline electropolymerization as well as the effects of anionic dopants on its optical and electrochemical properties. The optical measurements were correlated with the doping and dedoping processes of the films by means of a comparative study of these processes by QCM due to the better establishment of this technique in the investigation of these processes. Finally, with the purpose of explore the sensitivity of the SPR technique in sub-nanometric size systems, the SPR technique was applied in the investigation of selfassembled monolayers of 11-mercapto-undecanoic acid and mono(6-deoxy-6-mercapto)-b- cyclodextrin. In this sense, were determined the thickness and dielectric constant of these films as well as the adsorption kinetic by using a kinetic model based on adsorption, desorption and re-arrangement of molecules

ASSUNTO(S)

detectores quartz crystal microbalance sensors surface plasmon resonance microbalança de cristal de quartzo ressonancia de plasmon de superficie

ACESSO AO ARTIGO

Documentos Relacionados