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Sensors and actuators. B, Chemical v.259, 2018년, pp.900 - 907   SCI SCIE SCOPUS
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

The optical response of ZnO nanorods induced by oxygen chemisorption and desorption

Brahma, Sanjaya (Department of Physics, National Cheng Kung University, Tainan 701, Taiwan ) ; Yang, Chi-Wei (Department of Physics, National Cheng Kung University, Tainan 701, Taiwan ) ; Wu, Chiu-Hsin (Department of Physics, National Chung Hsing University, Taichung 402, Taiwan ) ; Chang, Feng-Ming (Department of Physics, National Cheng Kung University, Tainan 701, Taiwan ) ; Wu, Tsung-Jhe (Department of Physics, National Cheng Kung University, Tainan 701, Taiwan ) ; Huang, Chien-Sheng (Department of Electronic Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan ) ; Lo, Kuang-Yao (Department of Physics, National Cheng Kung University, Tainan 701, Taiwan ) ;
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    Abstract We demonstrate a strategic approach to realize the oxygen chemisorption and desorption over ZnO nanorods (ZNRs) by second harmonic generation (SHG), X-ray photoelectron spectroscopy (XPS) and a strong correlation is established in order to illustrate the quality of the top surface properties. A detailed investigation is carriedout with the variation of annealing temperature and oxygen flow rate for the optimization of the oxygen adsorption/desorption behavior. Oxygen species ionosorbed on ZNRs create a built-in electric field beneath the surface of ZNRs at room temperature and this directly reflects on the changes in the electric field induced SHG. The trend of decrease/increase in the intensity of SHG due to Ultraviolet irradiation and under rich oxygen atmosphere depends strongly on the quality of ZnO surface after post-annealing treatment. SHG is used extensively to indicate the dynamic chemisorption and desorption of oxygen on ZNRs in ambient atmosphere, which can assist the related research of oxygen adsorption in XPS under high vacuum. Highlights Develop an optical response method to realize O adsorption/desorption on ZnO nanorods. Second harmonic generation (SHG) and XPS have same resolution to analyze O adsorption. O ionosorption at rich O or desorption at UV irradiation is analyzed by change in SHG. O ionosorption causes electric field induced SHG and extra dipole on ZnO nanorods. A strong correlation between SHG and XPS well realize O chemisorption and desorption.


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