Tailoring the Anodic Hafnium Oxide Morphology Using Different Organic Solvent Electrolytes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020-02

Autores

Apolinário, A. (Autor) FCUP; Sousa, CT (Autor) FCUP; Oliveira, G. N.P. (Autor) FCUP; Lopes, A.M.L. (Autor) FCUP; ventura, j. (Autor) FCUP; Andrade, L. (Autor) FEUP; Adélio Mendes (Autor) FEUP; araujo, j. p. (Autor) FCUP

Revista

Título: Nanomaterials

Vol. 10

Página Final: 382

ISSN: 2079-4991

Editora: MDPI

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 7 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

EnReflect - Sistemas da envolvente de elevada refletância solar com inclusão de nanopartículas

EnergySwitch - Refrigerador Magnetocalorico baseado em interruptores térmicos de alta eficiência

LEPABE - Financiamento Plurianual 2020-2023 da Unidade de I&D LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Outras Informações

ID Authenticus: P-00R-S9A

DOI: 10.3390/nano10020382

Abstract (EN): Highly ordered anodic hafnium oxide (AHO) nanoporous or nanotubes were synthesized by electrochemical anodization of Hf foils. The growth of self-ordered AHO was investigated by optimizing a key electrochemical anodization parameter, the solvent-based electrolyte using: Ethylene glycol, dimethyl sulfoxide, formamide and N-methylformamide organic solvents. The electrolyte solvent is here shown to highly affect the morphological properties of the AHO, namely the self-ordering, growth rate and length. As a result, AHO nanoporous and nanotubes arrays were obtained, as well as other different shapes and morphologies, such as nanoneedles, nanoflakes and nanowires-agglomerations. The intrinsic chemical-physical properties of the electrolyte solvents (solvent type, dielectric constant and viscosity) are at the base of the properties that mainly affect the AHO morphology shape, growth rate, final thickness and porosity, for the same anodization voltage and time. We found that the interplay between the dielectric and viscosity constants of the solvent electrolyte is able to tailor the anodic oxide growth from continuous-to-nanoporous-to-nanotubes.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15