CAJ | 학술논문

以Zn(NO_3)_2·6H_2O和CO(NH_2)_2为原料.采用均匀沉淀法,制备出了.棒状、花状、球状纳米氧化锌(ZnO).将ZnO微球体分散在Na_2S溶液中,通过离子替代法,成功制备了ZnO/ZnS核壳结构.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)等测试手段对ZnO纳米结构和ZnO/ZnS核壳结构的晶体结构和表面形貌进行了表征,初步探讨了纳米ZnO和ZnO/ZnS核壳结构的生长机理.根据测试结果得知,ZnO纳米棒呈现六方纤锌矿结构,随着Zn~(2+)浓度逐渐增加,ZnO纳米结构形貌由单分散的棒状聚集成花状,最后演变成球形.ZnO/ZnS复合结构为内核ZnO,外面包覆一层ZnS的核壳结构.所有的纳米ZnO均具有相似的发光特点,ZnO/ZnS核壳结构的发光性能有了很大的改善.
이Zn(NO_3)_2·6H_2O화CO(NH_2)_2위원료.채용균균침정법,제비출료.봉상、화상、구상납미양화자(ZnO).장ZnO미구체분산재Na_2S용액중,통과리자체대법,성공제비료ZnO/ZnS핵각결구.이용X사선연사의(XRD)、소묘전자현미경(SEM)、능보의(EDS)등측시수단대ZnO납미결구화ZnO/ZnS핵각결구적정체결구화표면형모진행료표정,초보탐토료납미ZnO화ZnO/ZnS핵각결구적생장궤리.근거측시결과득지,ZnO납미봉정현륙방섬자광결구,수착Zn~(2+)농도축점증가,ZnO납미결구형모유단분산적봉상취집성화상,최후연변성구형.ZnO/ZnS복합결구위내핵ZnO,외면포복일층ZnS적핵각결구.소유적납미ZnO균구유상사적발광특점,ZnO/ZnS핵각결구적발광성능유료흔대적개선.
Rod-like, flower-like and sphere-like ZnO were prepared by homogeneous precipi-tation method with Zn(NO_3)_2· 6H_2O and urea as reactive materials. The ZnO/ZnS core/shell structure was formed through sulfuration conversion from ZnO microspheres in the Na_2S solution. The crystal structure and morphology of the as-synthesized samples were in-vestigated by means of X- ray diffraction(XRD), scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy(EDS). The results show that the as-synthesized ZnO crystals are hexagonal wurtzite structure. SEM images indicated that ZnO hexagonal nano-rods grew along c axis and the growth mechanism of ZnO nanorods was discussed. At low Zn~+ concentration, the morphology of the ZnO nanostructure is flower-like collection assem-bled from rod-like dispersed single crystals. With the increasing of Zn~(+2) concentration, the morphology of ZnO nanostructure changed into spherical collection. The core/shell structure is composed of both ZnO and ZnS. All the products of ZnO nanocrystals exhibited similar photoluminescence characteristics, while the core/shell structure showed an improved emission feature.