State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, PR China.
ACS Appl Mater Interfaces. 2013 Jun 26;5(12):5861-7. doi: 10.1021/am401533w. Epub 2013 Jun 4.
Zinc carbonate hydroxide nanobelts are prepared by the hydrolysis of zinc acetate aqueous solution in the presence of urea at 90 °C. The zinc carbonate hydroxide nanobelts can be facilely self-assembled in a circular flexible freestanding film with a diameter of 8.4 cm and thickness of 48 μm. The calcination of the zinc carbonate hydroxide nanobelts at 300 °C under normal atmospheric condition results in the formation of ZnO nanowires. The zinc carbonate hydroxide nanobelts and resultant ZnO nanowires are characterized by XRD, SEM, TEM, TG-DSC, PL, and impedance measurement. The characterization results indicate that the ZnO nanowires exhibit unique nanostructure characterized by long chains of closely attached ZnO nanocrystals with ZnO/ZnO nanocrystal junctions. The unique ZnO nanowire-based UV photodetector exhibit much higher photoresponse currents (at the milliampere level) and on/off current ratio (1000) than ZnO nanocrystal-based UV photodetector. Under the UV irradiance of 120 mW cm(-2) and low applied voltage of 0.5 V, the peak photoresponse current and on/off current ratio of the ZnO nanowire photodetector are 56 and 36 times higher than those of the ZnO nanocrystal UV photodetector, respectively. The reason for the superior photodetection performance of the ZnO nanowires over the ZnO nanocrystals is discussed.
碳酸锌氢氧化物纳米带是通过在 90°C 下，在乙酸锌水溶液中加入尿素水解制备的。碳酸锌氢氧化物纳米带可以很容易地在一个直径为 8.4 厘米、厚度约为 48 微米的圆形柔性独立薄膜中自组装。将碳酸锌氢氧化物纳米带在 300°C 下于常压下煅烧，得到氧化锌纳米线。通过 XRD、SEM、TEM、TG-DSC、PL 和阻抗测量对碳酸锌氢氧化物纳米带和所得的氧化锌纳米线进行了表征。表征结果表明，氧化锌纳米线具有独特的纳米结构，由紧密附着的氧化锌纳米晶链和 ZnO/ZnO 纳米晶结组成。基于独特的氧化锌纳米线的紫外光电探测器表现出更高的光响应电流（毫安级）和开关电流比（~1000），比基于氧化锌纳米晶的紫外光电探测器更高。在 120 mW cm(-2)的紫外辐照度和 0.5 V 的低外加电压下，氧化锌纳米线光电探测器的峰值光响应电流和开关电流比分别比氧化锌纳米晶紫外光电探测器高 56 倍和 36 倍。讨论了氧化锌纳米线优于氧化锌纳米晶的优越光电检测性能的原因。
