Browsing by Author "Huang, Wen Chang"

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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.
ZnO/ZnS core-shell nanostructures for hydrogen gas sensing performances
(2019-10-01)
Tsai, Yu-Sheng
;
Chou, Tsung-Wei
;
Xu, Chun Yu
;
Huang, Wen Chang
;
Lin, Chia Feng
ZnO/ZnS core-shell structures were hydrothermally grown on SiO2 substrates functioning as hydrogen gas sensing chips. Results indicate that a core-shell structure with an appropriate sulfurization period of 10 min had better H-2 sensing performance than those of all other growth conditions. Furthermore, multiple material characterizations revealed that ZnS with a growth time of 10 min could form high-quality and good-adherent ZnS powders with moderate thickness attached to the ZnO nanorods. Because of their small size, portability, simple fabrication and high sensitivity, ZnO/ZnS core-shell based H-2 gas sensors show promise for future H-2 detecting applications.