Control of the shell structure of ZnO–ZnS core-shell structure |
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Authors: | Woo Hyun Nam Young Soo Lim Won-Seon Seo Hyung Koun Cho Jeong Yong Lee |
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Institution: | (1) Green Ceramics Division, Korea Institute of Ceramic Engineering and Technology, 233-5 Gasan-dong, Geumcheon-gu, Seoul, 153-801, Republic of Korea;(2) Departement of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea;(3) School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Republic of Korea; |
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Abstract: | Nanostructured ZnO–ZnS core-shell powders were synthesized through a solution method using a thioacetamide (TAA) solution
in deionized water. ZnO powder and TAA solution were employed to supply zinc and sulfur ions to form the ZnO–ZnS core-shell
structures. The structure of the ZnS shell was strongly affected by the mole concentration of the TAA, and the structural
properties were characterized by X-ray diffraction and high-resolution transmission electron microscopy. The optical properties
of the nanostructured powders were also compared with those of pure ZnO powder. The ultraviolet (UV) emission was greatly
enhanced compared to when pure ZnO powder was used in the nanostructured powder synthesized using the 0.5 M TAA solution,
while the UV emission of that with the 0.05 M TAA solution was reduced. The green emission of the nanostructured powders was
reduced compared to when the pure ZnO powder was used. The mechanism of the structural changes in the core-shell structures
is proposed here and its effect on the luminescent properties is discussed. |
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