Wang Ruey-Chi, Hung Jian-Shiung
Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, 81148 Taiwan.
J Nanosci Nanotechnol. 2010 Sep;10(9):5634-40. doi: 10.1166/jnn.2010.2471.
Novel single-crystalline ZnO-Sn:ZnO (SZO) core-shell nanowires and ZnO-Zn2SnO4 (ZTO) comb-like nanocomposites were synthesized by thermal chemical vapor deposition at a low temperature of 650 degrees C. Scanning electron microscopy and transmission electron microscopy show the diameters and lengths of the core-shell nanowires are in ranges of 25-60 nm and 300-500 nm, respectively. The atomic ratios of Sn to (Zn + Sn) in the central and shell parts of the nanowire are 0.4 at.% and 6.1 at.%, respectively. The ZnO-ZTO comb-like nanocomposites possess ZnO nanocombs with ZTO nano-layers deposited on both sides of them. The ZnO branches and ZTO layers are single-crystalline wurtzite and spinel structures growing along the [0002] and [111] directions, respectively. Room-temperature cathodoluminescence measurements show the nanocomposites exhibit strong ultraviolet (UV) emissions at 300, 384 nm, and a broad green emission. The novel luminescence shows promising singularity for opto-electronic applications.
通过在650摄氏度的低温下进行热化学气相沉积，合成了新型的单晶ZnO-Sn:ZnO（SZO）核壳纳米线和ZnO-Zn2SnO4（ZTO）梳状纳米复合材料。扫描电子显微镜和透射电子显微镜显示，核壳纳米线的直径和长度分别在25-60纳米和300-500纳米范围内。纳米线中心部分和壳部分中Sn与（Zn + Sn）的原子比分别为0.4原子百分比和6.1原子百分比。ZnO-ZTO梳状纳米复合材料具有ZnO纳米梳，在其两侧沉积有ZTO纳米层。ZnO分支和ZTO层分别是沿[0002]和[111]方向生长的单晶纤锌矿和尖晶石结构。室温阴极发光测量表明，该纳米复合材料在300、384纳米处表现出强烈的紫外（UV）发射以及宽的绿色发射。这种新型发光在光电子应用方面显示出有前景的独特性。
