Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, P. R. China.
Frontier Science Center for Quantum Information, Beijing 100084, P. R. China.
Nano Lett. 2023 Jul 12;23(13):6059-6066. doi: 10.1021/acs.nanolett.3c01383. Epub 2023 Jun 22.
Here, we report a novel, feasible, and cost-effective method for the preparation of one-dimensional TiO nanowire arrays using a super-aligned carbon nanotube film as a template. Pure-anatase-phase TiO nanowires were scalably prepared in a suspended manner, and a high-performance ultraviolet (UV) photodetector was realized on a flexible substrate. The large surface area and one-dimensional nanostructure of the TiO nanowire array led to a high detectivity (1.35 × 10 Jones) and an ultrahigh photo gain (2.6 × 10), respectively. A high photoresponsivity of 7.7 × 10 A/W was achieved under 7 μW/cm UV (λ = 365 nm) illumination at a 10 V bias voltage, which is much higher than those of commercial UV photodetectors. Additionally, by taking advantage of its anisotropic geometry, we found the TiO nanowire array showed polarized photodetection. The concept of using nanomaterial systems shows the potential for realization of nanostructured photodetectors for practical applications.
在这里，我们报告了一种新颖、可行且具有成本效益的方法，可使用超级对齐的碳纳米管薄膜作为模板来制备一维 TiO 纳米线阵列。以悬浮方式可大规模制备纯锐钛矿相 TiO 纳米线，并在柔性衬底上实现了高性能紫外（UV）光电探测器。TiO 纳米线阵列的大表面积和一维纳米结构分别导致高探测率（1.35×10 Jones）和超高光增益（2.6×10）。在 10 V 偏置电压下，在 7 μW/cm 的 UV（λ=365nm）照射下，实现了 7.7×10 A/W 的高光响应率，远高于商用 UV 光电探测器的响应率。此外，利用其各向异性的几何形状，我们发现 TiO 纳米线阵列表现出偏振光电探测。利用纳米材料系统的概念展示了实现用于实际应用的纳米结构光电探测器的潜力。
