Lee Geon Joon, Min Soon-Ki, Oh Cha-Hwan, Leel YoungPak, Lim Hyunjin, Cheong Hyeonsik, Nam Hyun Jung, Hwangbo Chang Kwon, Min Sun-Ki, Han Sung-Hwan
Quantum Photonic Science Research Center, Hanyang University, Seoul 133-791, Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):511-7. doi: 10.1166/jnn.2011.3260.
We studied the effects of seed layers on the structural and optical properties of ZnO nanorods. ZnO and Ag-doped ZnO (ZnO:Ag) seed layers were deposited on glass substrates by magnetron co-sputtering. ZnO nanorods were grown on these seed layers by the chemical bath deposition in an aqueous solution of Zn(NO3)2 and hexamethyltetramine. SEM micrographs clearly reveal that ZnO nanorods were successfully grown on both kinds of seed layers. The XRD patterns indicate that crystallization of ZnO nanorods is along the c-axis. Meanwhile, the packing density and the vertical alignment of the ZnO nanorods on the ZnO seed layer are better than those of the ZnO nanorods on ZnO:Ag. The enhanced growth of nanorods is thought to be due to the fact that the ZnO layer exhibits a higher crystalline quality than the ZnO:Ag layer. According to the low-temperature photoluminescence spectra, the ZnO nanorods on the ZnO seed layer show a narrow strong ultraviolet emission band centered at 369 nm, while those on ZnO:Ag exhibit multiple bands. These results are thought to be related with the crystallinity of ZnO nanorods, the morphologies of ZnO nanorods, and the reflectivities of seed layers. More detailed studies for clarification of the seed layer effect on the growth of ZnO nanorods are desirable.
我们研究了籽晶层对ZnO纳米棒结构和光学性质的影响。通过磁控共溅射在玻璃衬底上沉积ZnO和Ag掺杂的ZnO（ZnO:Ag）籽晶层。在含有Zn(NO3)2和六亚甲基四胺的水溶液中，通过化学浴沉积在这些籽晶层上生长ZnO纳米棒。扫描电子显微镜（SEM）显微照片清楚地表明，两种籽晶层上均成功生长了ZnO纳米棒。X射线衍射（XRD）图谱表明，ZnO纳米棒沿c轴结晶。同时，ZnO籽晶层上ZnO纳米棒的堆积密度和垂直排列比ZnO:Ag上的ZnO纳米棒更好。纳米棒生长增强被认为是由于ZnO层比ZnO:Ag层具有更高的晶体质量。根据低温光致发光光谱，ZnO籽晶层上的ZnO纳米棒在369nm处呈现出一个窄的强紫外发射带，而ZnO:Ag上的纳米棒则呈现出多个发射带。这些结果被认为与ZnO纳米棒的结晶度、ZnO纳米棒的形貌以及籽晶层的反射率有关。为了阐明籽晶层对ZnO纳米棒生长的影响，需要进行更详细的研究。
