Lattice diffusion and vapor solid growths forming nanoarchitectures on ZnO nanowires

Author(s)

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

Affiliation

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

• Document type: Journal article
• Source: SUPERLATTICES AND MICROSTRUCTURES; v. 112, p. 180-185, DEC 2017.
• Web of Science Citations: 1

Abstract

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)

• FAPESP's process: 16/09769-3 - Synthesis and Physical Properties Characterization of microtubes
• Grantee: José Antonio Souza
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/16172-5 - Synthesis and characterization of physical properties of nanosized materials
• Grantee: José Antonio Souza
• Support Opportunities: Regular Research Grants