Migration energy barriers for the surface and bulk of self-assembly ZnO nanorods

Feng Ming Chang, Zhong Zhe Wu, Jing Heng Huang, Wei Ting Chen, Sanjaya Brahma, Kuang Yao Lo

研究成果: Article

1 引文 (Scopus)

摘要

Post-annealing treatment is a necessary process to create/eliminate/repair defects in self–assembly (SA) metal oxide by providing enough thermal energy to the O atoms to overcome the migration energy barrier in ZnO. The height of migration energy barrier is dependent on the depth from the surface, which is hard to be estimated by theoretical calculations, as well as the optical analyses. SA ZnO nanorods (ZNRs) have high surface-to-volume ratio to provide complete picture between the optical and surface properties obtained by photoluminescence (PL) and ultraviolet/X-ray photoemission spectroscopy (UPS/XPS), which is used to investigate the evolution of structure and chemical states of the surface layers to reveal mutual agreement on all observations in PL, XPS, and UPS. We demonstrate variation of the surface structure of SA-ZNRs by scanning over a range of annealing temperatures and time to regulate the structure variation of SA-ZNRs, and their optical analyses agrees well with PL, XPS and UPS, which indicates the dependence of migration energy barriers on the depth from the surface of ZNR. The results reveal the well ZNRs formed at 570 °C and the further oxidation process and the formation of hydroperoxide on the Zn-rich surface of ZNRs at 640 °C.

原文English
文章編號811
期刊Nanomaterials
8
發行號10
DOIs
出版狀態Published - 2018 十月 9

指紋

Energy barriers
Nanorods
Self assembly
Photoluminescence
X ray photoelectron spectroscopy
Annealing
Photoelectron spectroscopy
X ray spectroscopy
Thermal energy
Surface structure
Oxides
Hydrogen Peroxide
Surface properties
Repair
Optical properties
Metals
Scanning
Atoms
Oxidation
Defects

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

引用此文

Chang, Feng Ming ; Wu, Zhong Zhe ; Huang, Jing Heng ; Chen, Wei Ting ; Brahma, Sanjaya ; Lo, Kuang Yao. / Migration energy barriers for the surface and bulk of self-assembly ZnO nanorods. 於: Nanomaterials. 2018 ; 卷 8, 編號 10.
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Migration energy barriers for the surface and bulk of self-assembly ZnO nanorods. / Chang, Feng Ming; Wu, Zhong Zhe; Huang, Jing Heng; Chen, Wei Ting; Brahma, Sanjaya; Lo, Kuang Yao.

於: Nanomaterials, 卷 8, 編號 10, 811, 09.10.2018.

研究成果: Article

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