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首页> 外文期刊>Journal of nonlinear optical physics & materials >Nanocrystalline aluminum doped zinc oxide coated fiber optic for ultraviolet detection
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Nanocrystalline aluminum doped zinc oxide coated fiber optic for ultraviolet detection

机译：用于紫外检测的纳米晶铝掺杂氧化锌涂层光纤

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摘要

In this paper, we report the fabrication and characterization of an ultraviolet sensing by using Al-doped ZnO films coated on quartz slide and silica fiber optic. Undoped ZnO, 0.5, 1, 2 and 3 at.% of Al were prepared by sol-gel method with annealing temperature of 400°C for 1 h. The presence of spherical shaped nanoparticles and hexagonal (wurtzite) structure were detected for Al doped ZnO by using FESEM and XRD. The band gap values increased by adding Al due to the increment of carrier concentration. I-V curves reveal an ohmic line and improvement in electrical conductivity when the samples are illuminated by ultraviolet (UV) light with a wavelength of 365 nm. At 1 at.% of Al, the film have a larger increment in photocurrent response when illuminated with UV light compared to undoped ZnO and higher concentration (2 at.% and 3 at.%) of Al. For coated fiber optic, the fiber operates under leaky mode and the refractive index of ZnO is decreasing under UV radiation. There is a small drop in output intensity and increased abruptly which depends on the changes of ZnO refractive index. The thin films have a longer recovery time than response time.
机译：在本文中，我们报告了通过在石英玻片和石英光纤上涂覆铝掺杂的ZnO薄膜来制作和表征紫外线传感技术。通过溶胶-凝胶法在400℃的退火温度下制备1小时的未掺杂ZnO，0.5、1、2和3 at。％的Al。使用FESEM和XRD检测了Al掺杂的ZnO球形纳米颗粒和六方（纤锌矿）结构的存在。由于载流子浓度的增加，通过添加Al增加了带隙值。当样品被波长为365 nm的紫外线（UV）照射时，IV曲线显示出一条欧姆线并改善了电导率。与未掺杂的ZnO相比，当铝的含量为1 at。％时，与未掺杂的ZnO和更高浓度的Al（2 at。％和3 at。％）相比，该膜在光电流响应中的增大更大。对于涂层光纤，光纤在泄漏模式下工作，而ZnO的折射率在紫外线辐射下会降低。取决于ZnO折射率的变化，输出强度会有小幅下降，并突然增加。薄膜的恢复时间比响应时间长。

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