Nano/Micro-Structured ZnO Rods Synthesized by Thermal Chemical Vapor Deposition with Perpendicular Configuration.

Seok Cheol Choi,Do Kyung Lee,Sang Ho Sohn

doi:10.3390/nano11102518

Seok Cheol Choi, Do Kyung Lee + Show 1 more

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https://doi.org/10.3390/nano11102518

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Abstract

Under a one-step process, catalyst-free growth of one-dimensional (1D) ZnO hierarchical nanostructures was performed on ZnO-seeded Si substrate by thermal chemical vapor deposition with a perpendicular setup. The morphological and crystallographic properties of the nano/micro-structured ZnO rods were investigated with varying growth temperature and growth time. X-ray diffraction patterns of 1D ZnO double-structured rods showed the hexagonal wurtzite structure. The morphology and crystal structure of the ZnO double-structured rods were sensitive to the growth temperature and growth time. From Raman scattering and photoluminescence spectra, the orientation and size effects of the ZnO double-structured rods were discussed in relation to growth temperatures and growth times.

Highlights

For a growth time of 20 min, ZnO nanocrystallites showed an increase in width from about 100 to 250 nm with increasing growth temperature
By using thermal chemical vapor deposition (CVD) with a perpendicular setup, we synthesized the 1D ZnO doublestructured rods on hydrophobic ZnO-coated Si substrates through the VLS mechanism via a self-catalytic process
In FE-SEM analysis, the morphology change of the ZnO doublestructured rods could be obtained by controlling growth temperature and growth time

Summary

Introduction

Under a one-step process, catalyst-free growth of one-dimensional (1D) ZnO hierarchical nanostructures was performed on ZnO-seeded Si substrate by thermal chemical vapor deposition with a perpendicular setup. The morphological and crystallographic properties of the nano/microstructured ZnO rods were investigated with varying growth temperature and growth time. The morphology and crystal structure of the ZnO double-structured rods were sensitive to the growth temperature and growth time. From Raman scattering and photoluminescence spectra, the orientation and size effects of the ZnO double-structured rods were discussed in relation to growth temperatures and growth times. It is prerequisite to synthesize ZnO nanostructures with unique spatial architectures and specific surface area. For chemical vapor deposition (CVD), as one of the dry methods, some literature on the fabrication and characterization of ZnO hierarchical architectures was reported. Most CVD methods for ZnO hierarchical nanostructures are based on multi-step fabrication process

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