Banca de QUALIFICAÇÃO: LIZIA MARIA OLIVEIRA GONÇALVES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: LIZIA MARIA OLIVEIRA GONÇALVES
DATA: 29/09/2020
HORA: 09:00
LOCAL: Sala Virtual Meet
TÍTULO: Development of pencil and battery graphite electrodes modified with Prussian blue nanoparticles for sensor application
PALAVRAS-CHAVES: Pencil graphite electrode, battery graphite electrode, electrodeposition, Prussian Blue nanoparticles, electrochemical sensing.
PÁGINAS: 20
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

The development of efficient, fast, and low-cost methods of detection is attractive for the fabrication of new sensors. In this work, we report the modification of pencil (PGE) and battery (BGE) electrodes with Prussian Blue (PB). The modified electrodes were prepared by electrodeposition in an acid medium, and the formation of PB on their surface was confirmed by spectroscopic analysis and cyclic voltammetry. The UV-Vis analysis showed the presence of the
PB characteristic band at λ = 803 nm, the FTIR presented the band corresponding to the Fe2+—CN—Fe3+ bond in 2086 cm -1 , and the cyclic voltammograms (CV) exhibited the presence of two redox pair, corresponding to the conversion of PB into Prussian White and Prussian Green. The electrochemical properties of these electrodes were compared with the traditional glassy carbon electrode (GCE-PB). An increase in faradaic currents was observed in PGE-PB and BGE-PB voltammograms when compared with GCE-PB, also the amount of PB species and the thickness of the film on modified electrodes was very distinct in each; this associated with the structural and intrinsic porosity differences in the electrodes material. Then, PGE-PB and BGE-PB were used for the detection of H2O2 and dopamine, the results demonstrated their potential to future applications as a platform for sensing of molecular targets.

MEMBROS DA BANCA:
Presidente - 1508806 - WELTER CANTANHEDE DA SILVA
Interno - 2406262 - ROBERTO ALVES DE SOUSA LUZ
Interno - 1714171 - JANILDO LOPES MAGALHAES
Interno - 2157495 - ANDERSON NOGUEIRA MENDES
Externo à Instituição - RAFAEL RODRIGUES DE MORAES - IFMA