Tsai You-Ting, Chang Shoou-Jinn, Ji Liang-Wen, Hsiao Yu-Jen, Tang I-Tseng, Lu Hao-Ying, Chu Yen-Lin
Institute of Microelectronics & Department of Electrical Engineering, Center for Micro/Nano Science and Technology, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan.
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan.
ACS Omega. 2018 Oct 22;3(10):13798-13807. doi: 10.1021/acsomega.8b01882. eCollection 2018 Oct 31.
An ultraviolet-enhanced (UV-enhanced) nitric oxide (NO) sensor based on silver-doped zinc oxide (ZnO) nanoflowers is developed using a low-cost hydrothermal method. The results indicate that silver (Ag) ions were doped into the ZnO nanostructure successfully, thus changing the morphology. In the high-resolution transmission electron microscopy images, we also found that some Ag ions were separated out onto the surface of the ZnO nanoflowers and that the Ag-doped and Ag nanoparticles improved the sensing property. The NO sensing property increased from 73.91 to 89.04% through the use of a UV light-emitting diode (UV-LED). The response time was approximately 120 s without the UV-LED, and the UV-enhanced Ag-doped ZnO nanoflower sensor exhibited a reduced response time (60 s). The best working temperature could be reduced from 200 to 150 °C using UV light illumination, and it was found that the NO response increased by 15.13% at 150 °C. The UV photoresponse of the Ag-doped ZnO nanoflowers and the mechanisms by which the improvement of NO sensing property occurred through the use of UV light illumination are discussed. The property of the gas sensor can be calibrated using a self-photoelectric effect under UV light illumination. These interesting UV-enhanced Ag-doped ZnO nanoflowers are viable candidates for practical applications.
采用低成本水热法研制了一种基于银掺杂氧化锌（ZnO）纳米花的紫外增强型一氧化氮（NO）传感器。结果表明，银（Ag）离子成功地掺杂到ZnO纳米结构中，从而改变了其形貌。在高分辨率透射电子显微镜图像中，我们还发现一些Ag离子在ZnO纳米花表面析出，且Ag掺杂和Ag纳米颗粒提高了传感性能。通过使用紫外发光二极管（UV-LED），NO传感性能从73.91%提高到89.04%。在没有UV-LED的情况下，响应时间约为120 s，而紫外增强型Ag掺杂ZnO纳米花传感器的响应时间缩短（60 s）。使用紫外光照射可将最佳工作温度从200℃降至150℃，发现在150℃时NO响应提高了15.13%。讨论了Ag掺杂ZnO纳米花的紫外光响应以及通过紫外光照射提高NO传感性能的机制。气体传感器的性能可在紫外光照射下利用自光电效应进行校准。这些有趣的紫外增强型Ag掺杂ZnO纳米花是实际应用的可行候选材料。
