Park Y K, Umar Ahmad, Kim S H, Hahn Yoon-Bong
School of Semiconductor and Chemical Engineering, and BK 21, Centre for Future Energy Materials and Devices, Chonbuk National University, Jeonju, South Korea 561-756.
J Nanosci Nanotechnol. 2008 Dec;8(12):6349-54.
Quasi-aligned ZnO nanotubes were grown in a high density on Si substrate via aqueous solution method at low temperature of 65 degrees C by using zinc nitrate and hexamethylenetetramine. The detailed structural characterizations revealed that the as-synthesized nanotubes are single-crystalline possessing a hexagonal phase and grown along the [0001] direction. Raman-scattering spectrum exhibits a strong and sharp optical-phonon E2 high-mode at 437 cm(-1) again confirming the good crystal quality with hexagonal crystal structure for the as-synthesized nanotubes. A strong ultraviolet (UV) emission with a weak and broad orange is observed from the room-temperature photoluminescence (PL) spectrum which substantiates the good optical properties for the as-grown nanotubes. The detailed growth mechanism has also been proposed for the formation of as-grown nanotubes based on chemical reactions involved and different crystallographic habits of wurtzite hexagonal ZnO.
通过水溶液法，在65摄氏度的低温下，于硅衬底上利用硝酸锌和六亚甲基四胺以高密度生长了准对齐的氧化锌纳米管。详细的结构表征显示，所合成的纳米管为具有六方相的单晶，并沿[0001]方向生长。拉曼散射光谱在437厘米-1处呈现出强烈而尖锐的光学声子E2高模，再次证实了所合成纳米管具有六方晶体结构的良好晶体质量。从室温光致发光（PL）光谱中观察到强烈的紫外（UV）发射以及微弱且宽泛的橙色发射，这证实了所生长纳米管具有良好的光学性质。基于所涉及的化学反应以及纤锌矿六方氧化锌的不同晶体习性，还提出了所生长纳米管形成的详细生长机制。
