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Cu衬底上ZnO纳米结构及其光催化性能分析
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作者 段金霞 涂宽 敖志光 《湖北工程学院学报》 2014年第3期68-72,共5页
采用两步电化学沉积法在Cu衬底上沉积得到ZnO纳米结构薄膜。用X-射线衍射(XRD)和扫描电子显微镜(SEM)对其结构及形貌进行表征,发现先在Cu衬底上沉积一层Zn致密膜,更有利于在其表面上得到附着力强、形貌较好的ZnO纳米结构膜。系统考察了... 采用两步电化学沉积法在Cu衬底上沉积得到ZnO纳米结构薄膜。用X-射线衍射(XRD)和扫描电子显微镜(SEM)对其结构及形貌进行表征,发现先在Cu衬底上沉积一层Zn致密膜,更有利于在其表面上得到附着力强、形貌较好的ZnO纳米结构膜。系统考察了沉积温度和沉积时间等工艺参数对ZnO纳米结构的影响。结果表明,沉积温度和沉积时间对晶体结构和形貌有显著影响,通过对工艺进行适宜控制可以得到结晶性良好的六方纤锌矿型ZnO纳米结构膜。以罗丹明B为目标有机污染物,分析了ZnO膜的光催化性能,表明所制备的ZnO膜可以作为光催化剂,其光催化效率可达到72.4%。 展开更多
关键词 电化学沉积 ZNO薄膜 光催化 罗丹明B
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Nanoplasmonic-gold-cylinder-array-enhanced terahertz source
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作者 敖志光 孙金海 +4 位作者 蔡禾 宋国峰 宋甲坤 宋玉志 徐云 《Journal of Semiconductors》 EI CAS CSCD 2016年第12期22-27,共6页
Photoconductive antennas (PCAs) based on nanoplasmonic gratings contact electrodes have been pro- posed to satisfy the demand for high power, efficiency and responsivity terahertz (THz) sources. Reducing the avera... Photoconductive antennas (PCAs) based on nanoplasmonic gratings contact electrodes have been pro- posed to satisfy the demand for high power, efficiency and responsivity terahertz (THz) sources. Reducing the average photo-generated carrier transport path to the photoconductor contact electrodes was previously considered the dominant mechanism to improve PCAs' power. However, considering the bias in a real device, the electric field between gratings is limited and the role of surface plasmonic resonance (SPR) field enhancement is more important in improving THz radiation. This paper, based on SPR, analyzes the interaction between incident light and substrate in nano cylinder array PCAs and clearly shows that the SPR can enhance the light absorption in the substrate. After the optimization of the structure size, the proposed structure can offer 87% optical transmission into GaAs substrate. Compared with conventional PCAs, the optical transmission into the substrate will increase 5.8 times and the enhancement factor of substrate absorption will reach 13.7 respectively. 展开更多
关键词 THz sources PCAs SPR plasmonic grating contact electrode optical-THz conversion efficiency
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