Banca de DEFESA: DANIELLE ASSIS DE ALBUQUERQUE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIELLE ASSIS DE ALBUQUERQUE LIMA
DATE: 05/09/2024
TIME: 15:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

Chitosan Thin Films Doped with Metal Oxide Nanoparticles: Production, Characterization, and Application in Supercapacitors

KEY WORDS:

Chitosan, Thin films, Nanocomposites, ZnO NPs, Supercapacitors.

PAGES: 118
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Polysaccharides have attracted increasing scientific interest over time, not only for their diverse applications but also for their economic viability and sustainability compared to synthetic polymers. Among these, chitosan stands out as one of the most extensively studied. Derived from the deacetylation of chitin, the second most abundant polysaccharide on the planet, chitosan possesses favorable characteristics such as biocompatibility, biodegradability, non-toxicity, and a versatile chemical structure due to the presence of hydroxyl and amine groups, making it suitable for various applications. Considering its adaptability, this study investigates the production of chitosan films, both doped and undoped, with pure zinc oxide (ZnO) nanoparticles, folic acid-doped (AF@ZnO NPs), and silver-doped (Ag@ZnO NPs), aiming to evaluate their structural, optical, and electrical properties. The efficiency of the doping and its effects at four different concentrations were analyzed, with a focus on identifying which nanocomposite has the greatest potential for application in supercapacitors. To this end, various analytical techniques were employed, including X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), UV-VIS spectroscopy, photoluminescence and FTIR spectroscopy, thermogravimetric analysis (TGA), tensile testing, and impedance measurements. The results indicated efficient doping with all variations of ZnO nanoparticles, as well as enhancement and addition of properties to the films, such as improved thermal stability, enhanced electrical properties, increased tensile strength, and good flexibility. In particular, the nanocomposites doped with Ag@ZnO NPs demonstrated characteristics suitable for use in supercapacitors, especially as part of the electrolyte separators.

COMMITTEE MEMBERS:
Externo à Instituição - ERIVERTON DA SILVA RODRIGUES - IFSertãoPE
Externo à Instituição - MARCELO SOUZA DA SILVA - IFSertãoPE
Presidente - 3199308 - PATRICIA MARIA ALBUQUERQUE DE FARIAS