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| Author(s): |
Cibely da Silva Martin Sonvesso
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Institution: | Universidade Estadual Paulista (Unesp) |
| Defense date: | 2017-08-25 |
| Advisor: | Carlos José Leopoldo Constantino |
| Abstract | |
This work reports the modification of conductor substrates in sensorial application from the deposition of thin films of two metallic complexes (Ni-Salpn and FePc) using the Langmuir-Schaefer (LS) and electrodeposition techniques, aiming to correlate the structural and electrochemical properties of these films. The Langmuir films of Ni-Salpn exhibited low stability on the interface water/air, which made it impossible the deposition of these films on solid substrates using the LS technique. However, were easy deposited by electrodeposition. In structural terms, the Ni-Salpn electrodeposited film showed a formation of “molecular columns”, being the Ni-Salpn molecules preferentially oriented with one of the complex macrocycles perpendicular to the substrate plane. The FePc films were formed by both deposition techniques (LS and electrodeposition). In structural terms, the FePc electrodeposited films were more homogeneous (surface morphology), less rough and more compact than the LS films. The FePc molecules are preferentially oriented in a flat-on position in relation to the substrate plane to both FePc films. The largest difference between FePc LS and FePc electrodeposited films is the oxidation state of the metal center, being the FeII to LS films and FeI to electrodeposited films. The electrochemical characterizations in supporting electrolyte and in presence of dopamine showed different behavior for Ni-Salpn and FePc films. The FePc films were more stable and with great potential to sensorial applications. The FePc films were electrochemically evaluated in catecholamines solutions (L-tyrosine, L-Dopa, dopamine, norepinephrine, and epinephrine) and also applied as a sensor to L-Dopa detection in real samples. In general, the supramolecular arrangement (which depends on metallic complexes and deposition technique) of the thin films have an influence on electrochemical behavior in catecholamines standard solutions as well as in sensorial responses. (AU) | |
| FAPESP's process: | 12/25140-7 - Thin films of metal complexes: the effect of the supramolecular architecture on the application of modified electrodes as catecholamine sensors. |
| Grantee: | Cibely da Silva Martin Sonvesso |
| Support Opportunities: | Scholarships in Brazil - Doctorate |