Zn_5(OH)_8Cl_2·H_2O微纳米片的超声合成与热解以及光致发光性能研究

Preparation of Zn_5(OH)_8Cl_2·H_2O sheets,pyrolysis analysis and its photoluminescence properties

运用超声化学法,以细化后的Zn、CCl_4和H_2O为原料合成了Zn_5(OH)_8Cl_2·H_2O微纳米片,将Zn_5(OH)_8Cl_2·H_2O微纳米片在500℃下高温裂解,收集并表征了所得固相产物的结构形貌和光致发光性能,同时重点分析了所得固相产物的形成过程和生长机理。结果表明:该制备方法反应迅速,合成的Zn_5(OH)_8Cl_2·H_2O纳米片径向尺寸分布在400 nm到3μm;所得到的固相产物为形貌不同的ZnO微纳米晶体,形成过程经历了高温裂解和置换反应;晶体生长符合VS生长机理。Si基底和Al_2O_3基底ZnO晶体在约515 nm处均出现了较宽绿峰,前者带边发光峰与深能级发光峰强度比相对较大,表明其缺陷较少结晶较好,该结果可指导Zn_5(OH)_8Cl_2·H_2O和多形貌ZnO微纳米晶体的可控制备与应用。

Zn5（OH）8Cl2·H2Onanosheets were prepared successfully with Zn, CCh and H2O by using sonochemistry method, and then different solid products were obtained with Zn5（OH）8Cl2·H2O nanosheets splitting under 500℃. The samples were characterized by X-my dififraction patterns, SEM, and PL spectra. Formation process of three kinds of ZnO crystals and their growth mechanism were analyzed. The results show that the preparation method is very efficient and the radial size of Zn5（OH）8Cl2·H2O nanosheets distribut among 400 nm to μ3 The formation process of thin films contains decomposition reaction and replacement reaction, and the growth of crystal conforms to VS mechanism. Both of ZnO thin films have a green peak located at around 515 nm wavelength regions. The ZnO thin films on Si substrates have a higher intensity ratio of the band-edge emission peak to deep-level photoluminescence peak, which suggests they have better crystallization and less defects. The resxdts have a certain theoretical significance on＇nano crystals preparation and property development.