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- 저자 : Jizhong Song (검색결과 4 건)
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Jizhong Song,Xue Ning,Haibo Zeng 한국물리학회 2015 Current Applied Physics Vol.15 No.11
One-dimensional ZnO materials have been promising for field-emission (FE) application, but how to facially control the alignment of ZnO emitters is still a great challenge especially for patterned display application. Here, we report the fabrication of novel ZnO nanowire (NW) line and bundle arrays for patterned field-electron emitters. The effects of PS template size and heating time on the resulted ZnO nanoarrays were systematically studied. The deformation degree of PS templates was controlled and hence utilized to adjust the alignment of electrochemically deposited ZnO arrays. It was found that the length of NW lines and the density of NW bundles can effectively tuned by the PS template heating time. The optimal FE performance with turn-on electric field as low as of 4.4 V μm-1 and the fieldenhancement factor as high as of 1450 were achieved through decreasing the screening effect among the patterned field-electron emitters.
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Controlling oxygen vacancies and properties of ZnO
Xiaoming Li,Jizhong Song,Yanli Liu,Haibo Zeng 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Intrinsic defects in semiconductors play crucial roles on their electrical and optical properties. In this article, we report on a facile method to control concentration of oxygen vacancies inside ZnO nanostructures and related physical properties based on adjustment of thermal transformation conditions from ZnO2 to ZnO, including annealing atmosphere and temperature. ZnO2 spheres assembled with nanoparticles were formed through the reaction between zinc nitrate and hydrogen peroxide. Significantly, it was found that the adopted temperature and atmosphere have remarkable impact on the concentration of oxygen vacancies, which was revealed by the variations of featured Raman scattering peaks at 584 cm1. Furthermore, with the increase of oxygen vacancies inside ZnO, the optical band-gap was found to red-shift 350 meV and the room-temperature ferromagnetism became stronger up to 1.6 emu/mg. The defect formation and evolution were discussed according to the chemical equilibrium of decomposition reaction under special local heating environment. This work demonstrated that ZnO2 decomposition is an effective process to control the defect states inside ZnO and related properties.
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High-temperature-mixing hydrothermal synthesis of ZnO nanocrystals with wide growth window
Jun Wen,Yonghong Hu,Kongjun Zhu,Yufang Li,Jizhong Song 한국물리학회 2014 Current Applied Physics Vol.14 No.3
High-quality and controllable growth of nanocrystals (NCs) have been attracting great attention. Here, a high-temperature-mixing hydrothermal (HTMH) method was designed to synthesize ZnO NCs with high crystallinity and narrow size distribution in a wide growth window. Compared with conventional hydrothermal (CH) growth, zinc source and alkali precursors were intentionally separated in temperaturerising stage and permitted to mix at the starting of heat preservation stage of HTMH growth. Highly crystalline ZnO NCs with uniform spherical morphology can be formed at alkali concentration and temperature windows as wide as 0.1e0.5 M and 160e200 C, respectively. However, the products via CH method have much larger changes in not only morphology but also size. These results demonstrated that the high-temperature-mixing reaction greatly facilitates nucleation but depresses grain growth. Considering the simplicity and reproducibility, such HTMH method could have wide potentials for the fabrication of various functional nanocrystals.
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