Banca de QUALIFICAÇÃO: LEONARDO HIDEKI HASIMOTO
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.DISCENTE : LEONARDO HIDEKI HASIMOTO
DATA : 04/08/2021
HORA: 09:00
LOCAL: on line
TÍTULO:
Polydopamine functionalization of flexible electrochemical devices
PÁGINAS: 70
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Eletroanalítica
RESUMO:
Surface nanofunctionalization is an important tool to bring new chemical functionalities to carbon-based electrodes. Since the discovery of polydopamine, it has been widely applied in materials science due to its simplicity and versatility. However, little attention has been given to prepare nanofunctionalized surfaces for flexible electrochemical paper-based devices. After fabricating the electrodes on paper substrates, polydopamine was formed over the surface of the working electrode using the chemical polymerization route. Polydopamine nanofilms (6 nm thick) on carbon were characterized by contact angle, X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy (topography and electrical measurements) and electrochemical techniques. After the nanofunctionalization it was observed that the presence of polydopamine nanofilm introduces oxygen and nitrogen-rich functionalities (R-NH2 and R-C=O) that decrease the contact angle of the electrode (72° to 48°C). Moreover, polydopamine nanofilms did not block the heterogeneous electron transfer. In fact, in this work it was observed one of the highest standard heterogeneous rate constants for electrochemical paper-based electrodes (1,4 x 10-3 cm s-1). In addition, functionalized electrodes exhibited two redox peaks in the cyclic voltammograms that can be ascribed to catechol/quinone redox pair.
MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1544341 - WENDEL ANDRADE ALVES
Membro Titular - Examinador(a) Interno ao Programa - 007.041.553-62 - RENATO SOUSA LIMA - UNICAMP
Membro Titular - Examinador(a) Externo à Instituição - RODRIGO ALEJANDRO ABARZA MUNOZ - UFU
Membro Suplente - Examinador(a) Interno ao Programa - 1761120 - DANILO JUSTINO CARASTAN
Membro Suplente - Examinador(a) Interno ao Programa - 2605463 - JOSE ANTONIO SOUZA
Membro Suplente - Examinador(a) Interno ao Programa - 052.991.506-52 - JULIANA DA SILVA BERNARDES - UNICAMP