Browsing by Author "Lee, Yu Shan"

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Investigations of Electro-hydrothermally Grown ZnO Nanostructures on Copper Grids
(2017-01-01)
Yu, Tzu-Yi
;
Hung, Chen Hao
;
Lee, Yu Shan
;
Lin, Chia Feng
;
Su, Wei Min
Two types of ZnO nanostructures were electro-hydrothermally deposited on mesh 100 and 200 copper grids. To investigate the nanostructures, multiple material analyses were used to analyze the material properties. FESEM images indicate that nanoflowers/nanorods could be grown on the mesh 100 copper grids while a single layer of ZnO nanorods could be grown on the mesh 200 copper grids. Since the size of the grid holes might influence the chemical reactions during the growth of the nanostructures, all the other material analyzes also reveale1 distinct material characteristics of these two types of nanostructures on the copper grid. Based on the experimental results, modulating the ZnO nanostructure will be helpful for future applications of ZnO nanostructures on copper substrates.
Morphological and crystalline analysis of ZnO/ZnS nanostructures on porous silicon substrate
(2020-08-01)
Tsai, Yu-Sheng
;
Hung, Chen Hao
;
Chan, Wei Lun
;
Tsai, Shang Je
;
Lee, Yu Shan
ZnO/ZnS core-shell nanostructures were successfully synthesized on porous silicon substrates using hydrothermal methods. Multiple morphological and crystalline characterizations were performed on the structures. Results indicate that a uniformly grown ZnS shell with a thickness of around 10 nm could be observed on the cross-section of ZnO/ZnS core-shell structures. Furthermore, different crystalline phases and morphologies could be observed in selected area diffraction patterns between neighboring nanostructures. Material compositional analysis conducted by energy-dispersive X-ray spectroscopy indicate that varied nanostructure element compositions grew perpendicular to the substrate. ZnS/ZnO nanostructures on porous silicon substrates show promise for future optoelectronic and electronic device applications.