论文部分内容阅读
在硝酸锌/(NH_2)_6N_4(HMTA)溶液体系中加入浓氨水及氯化铜,采用水热法制备Cu掺杂的ZnO薄膜。研究发现,氨水和Cu~(2+)离子均可抑制ZnO纳米棒的横向生长,促进纳米棒沿c轴取向生长,增加长径比,但并未发现Cu进入ZnO晶格中。ZnO水热阵列膜的形貌可以通过同时掺杂Cu2+和加入浓氨水来改变。Cu~(2+)离子和氨水共掺杂容易导致ZnO纳米棒的弯曲及纳米棒端头的聚集,形成由纳米棒团簇组成的星星状薄膜表面。PL谱显示,该结构具有较大的氧空位缺陷浓度及比表面积,并具有一定的场发射特性,场增强因子β为5990。
Cu doped ZnO thin films were prepared by hydrothermal method by adding concentrated aqueous ammonia and cupric chloride into the system of zinc nitrate / (NH_2) _6N_4 (HMTA) solution. It was found that both ammonia and Cu 2+ could inhibit the lateral growth of ZnO nanorods and promote the growth of nanorods along the c axis and increase the aspect ratio. However, Cu was not found in the ZnO lattice. The morphology of ZnO hydrothermal array films can be modified by the simultaneous doping of Cu2 + and the addition of concentrated aqueous ammonia. Cu 2+ ions and ammonia co-doping easily lead to the bending of ZnO nanorods and the aggregation of nanorod tips to form a star-shaped film surface composed of nanorod clusters. PL spectra show that the structure has a large oxygen vacancy defect concentration and specific surface area, and has certain field emission characteristics. The field enhancement factor β is 5990.