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.
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.
参考文献
[1] | Part Joodong,Choi Han-Ho,Siebein Kerry.Two-step evaporation process for formation of aligned zinc oxide nanowires[J].J.Crystal growth,2003,258:342-348. |
[2] | 李树玮,小池一步.ZnO材料的生长及表征[J].液晶与显示,2004,19(3):178-181. |
[3] | Xu Calling,Qin Donghuan,Li Huan.Low-temperature growth and optical properties of radial ZnO nanowires[J].Material Lett.,2004,58:3976-3979. |
[4] | 马淑芳,粱建,王连宏,等.ZnO六方纳米管晶体的制备与光致发光性能[J].发光学报,2008,29(1):182-184. |
[5] | 方国家,王明军,刘逆霜,等.ZnO纳米线阵列的定向生长、光致发光及场发射性能[J].发光学报,2008,29(3):421-424. |
[6] | 左艳彬,周卫宁,张昌龙,等.氧化锌晶体的水热法生长及性能表征[J].发光学报,2008,29(3):470-474. |
[7] | 刘少波,顾书林,刘伟,等.纳米ZnO生长及性质分析[J].发光学报,2008,29(3):527-531. |
[8] | 肖志国,罗昔贤.蓄光型发光材料及其制品[M].北京:化学工业出版社,2005:24-28. |
[9] | Wang Zhuo,Qian Xuefeng.Larges-cale synthesis of tube-like ZnS and cable-like ZnS-ZnO arrays:Preparation through the sulfuration conversion from ZnO arrays via a simple chemical solution route[J].J.Solid State Chemistry,2005,178.1589-1594. |
[10] | Zhang Hui,Xie Rong guo.Cathodoluminescence and its mapping of flower-like ZnO,ZnO/ZnS core-shell and tubelike ZnS nanostructures[J].Materials Research Bulletin,2007,42:1286-1292. |
[11] | 时文中,张昕,朱国才.制备纳米氧化锌前驱体碱式碳酸锌的热解动力学[J].无机盐工业,2004,36(6):19-22. |
[12] | 王濮,潘兆橹,翁玲宝.系统矿物学[M].北京;地质出版社,1982:294-395. |
[13] | Yah Chenglin,Xue Dongfeng.Room temperature fabrication of hollow ZnS and ZnO architect-tures by a sacrificial template route[J].Phys.Chem.B,2006,110:7102-7106. |
[14] | 侯旭峰,荆海,张会平.ZnO纳米棒/薄膜结构的电沉积制备及性能[J].液晶与显示,2007,22(6):694-700. |
[15] | Xue Z Y,Zhang D H,Wang Q P,et al.The blue photoluminescence emitted from ZnO films deposited on glass substrate by rf magnetron sputtering[J].Appl.Surface Science,2002,195:126-129. |
[16] | 靳福江,李珍.李飞.ZnO纳米棒水热法制备及其发光性能[J].功能材料与器件学报,2007,13(5),453-458. |
[17] | 高相东,李效民,于伟东.超声辅助SILAR法生长纳米晶ZnO多孔薄膜及其光学性能研究[J].无机材料学报,2005,20(4):965-970. |
[18] | 罗红波,谭劲,杨福华.等.In含量变化对N-In共掺杂ZnO薄膜的结构和性能的影响[J].功能材料,2007,38(增刊):59-62. |
[19] | Li Fei,Jiang Yin,Hu Liang,et al.Structural and luminescent properties of ZnO nanorods and ZnO/ZnS nanoeomposites[J].J.Alloys and Compounds,2008,149(6):1-5. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%