Sn掺杂ZnO纳米棒的制备及表征

以Zn(Ac)₂·2H₂O和 LiOH·H₂O作为反应物, 加入一定量的 SnCl₄·5H₂O, 以超声辅助醇热法制备出一系列不同Sn掺杂浓度的ZnO纳米棒。用XRD、TEM、FT-IR和EDX对所合成的样品进行表征。结果表明醇热18h的纯ZnO晶体形态多为棒状, 粒径分布均匀, 长度在45 nm左右, 且分散性良好; 而掺Sn的ZnO纳米棒的直径和长度则随着掺杂浓度的增大而增长。掺杂后的ZnO晶体仍为六方纤锌矿结构, 但随着Sn掺杂浓度的增大, 晶体的结晶性降低。在室温下对掺Sn的ZnO样品进行荧光光谱检测, 可以观察到3个发射峰, 包括:在400～410 nm处的紫色发射峰, 在455～470 nm蓝色发射峰, 在530 nm附近的绿光发射峰; 随着Sn掺杂浓度的增大, 发射峰的强度逐渐降低。

Preparation and Characterization of Sn-doped ZnO Nanorods

ZnO nanorods with different Sn doping concentrations have been synthesized via a ultrasound-assisted alcohol-thermal method with Zn(Ac)₂·2H₂O, LiOH·H₂O and SnCl₄·5H₂O as starting materials. XRD, TEM, FT-IR and EDX were employed to characterize the as-prepared samples. The results show that after 18 h alcohol thermal processing the undoped ZnO is mostly in the crystal form of rods with length about 45 nm, uniform size distribution and good dispersion. However, the diameter and length of the Sn-doped ZnO nanorods increase with the enhancement of doping concentration. The Sn-doped ZnO is still hexagonal wurtzite structure, but its crystallinity gradually reduces with the increase of doping concentration. The fluorescence spectrum of ZnO measured at room temperature shows three emission peaks of the Sn-doped ZnO nanorods, such as a violet emission peak at 400～410 nm, a blue peak at 455～470 nm and a green peak at about 530 nm. The emission intensity of the Sn-doped ZnO decreases gradually with the increase of doping concentration.