Banca de DEFESA: JÉSSICA HELISA HAUTRIVE ROSSATO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JÉSSICA HELISA HAUTRIVE ROSSATO
DATA : 03/12/2021
HORA: 14:00
LOCAL: Por participação remota
TÍTULO:

Synthesis of 1D nanostructures of RNiO3 oxides and applications

PÁGINAS: 89
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

            Different fields of application of nickelates oxides (RNiO_3, R = La, Pr, Nd...) and their nanostructures have been explored. Thus, in this work, we explore the synthesis of 1-D oxide nanostructures, such as LaNiO₃ and NdNiO₃ nanofibers and nanotubes, obtained by different techniques (template-assisted and electrospinning methods) and some applications, as flexible pressure sensors and electrochemical biosensors. The results showed the possibility to obtain nanofibers and nanotubes with a high surface/volume aspect ratio. LaNiO₃ nanofibers with mean diameters of 370 μm, with lengths greater than 10 μm and a distorted rhombohedral crystal structure were obtained. NdNiO3 nanotubes with different diameters (ranging from 20 to 150 nm) were obtained. The nanotubes presented a distorted orthorhombic perovskite structure with a high degree of orientation and uniformity. Furthermore, nanotubes diameters showed to affect nickel valence in these systems, modifying physical properties. From the synthesis and characterization of these nanostructures, two devices were developed: the first one was the flexible pressure sensor based on the deposition of LaNiO₃ nanofibers onto paper and sandwiched in PDMS, and the other was the electrochemical biosensor for ascorbic acid detection based on NdNiO₃ nanotubes. Both devices showed promising in their applications and show the possibility to increasingly explore different fields of applications of nickel oxide nanostructures.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1545738 - MARCIA TSUYAMA ESCOTE
Membro Titular - Examinador(a) Interno ao Programa - 1707133 - ISELI LOURENCO NANTES CARDOSO
Membro Titular - Examinador(a) Interno ao Programa - 1552290 - ANDRE SANTAROSA FERLAUTO
Membro Titular - Examinador(a) Externo à Instituição - PAULO NORONHA LISBOA-FILHO - UNESP
Membro Titular - Examinador(a) Externo à Instituição - ELAINE CRISTINA PARIS - EMBRAPA
Membro Suplente - Examinador(a) Interno ao Programa - 2604128 - ALEXANDRE JOSE DE CASTRO LANFREDI
Membro Suplente - Examinador(a) Externo à Instituição - VAGNER BERNAL BARBETA - FEI