Lattice diffusion and vapor solid growths forming nanoarchitectures on ZnO nanowires

Autor(es)

Sombrio, Guilherme ^[1] ; Rivaldo-Gomez, C. M. ^[1] ; Pomar, Cesar A. D. ^[1] ; Souza, Jose A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SUPERLATTICES AND MICROSTRUCTURES; v. 112, p. 180-185, DEC 2017.
• Citações Web of Science: 1

Resumo

We report hierarchical nanoarchitectures formed on the tips and sidewalls of ZnO nano wires which is formed on the top of microtubes. The whole growth process of these micro/nanostructures during thermal oxidation combines lattice/grain/surface ionic diffusion along with vapor solid mechanism. All the process takes place along with the presence of an electric current, which plays an important role forming the ZnO molecules due to Zn metal evaporation and attracting them to condense into nanostructures of several morphologies. The observation of a very long needle-like nanowire reveals the stack nature of the growth. These nanoarchitectures are rarely observed experimentally. Raman scattering confirms phonon confinement in the nanostructures. Photoluminescence measurements indicate a route for engineering defects on the surface of ZnO microtubes after the complete coalescence of the nanostructures through heat treatment. This experiment would be useful for improving nanostructure organization which could provide an impact in the manufacturability of nanostructure-based systems. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/09769-3 - Síntese e Caracterização de Propriedades Físicas de Microtubos
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/16172-5 - Síntese e caracterização das propriedades físicas de materiais nanoestruturados
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular