Mechanically Compatible UV Photodetectors Based on Electrospun Free-Standing Y3+-Doped TiO2Nanofibrous Membranes with Enhanced Flexibility
Mechanically Compatible UV Photodetectors Based on Electrospun Free-Standing Y3+-Doped TiO2Nanofibrous Membranes with Enhanced Flexibility
复制标题
基于电纺独立式 Y3 掺杂 TiO(2) 纳米纤维膜的机械兼容紫外光电探测器，具有增强的灵活性
DOI：
10.1002/adfm.202005291
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发表时间：
2020-09-20
影响因子：
19
通讯作者：
Fang, Xiaosheng
中科院分区：
文献类型：
--
作者：
Li, Ziliang;Joshi, Mahesh K.;Fang, Xiaosheng
自支撑柔性TiO（2）纳米纤维膜（NFM）对于构建高性能可穿戴电子设备非常重要。然而，由于多晶TiO（2）纳米纤维的脆弱特性，仍然存在巨大的挑战。在这里，通过简单的元素掺杂方法和静电纺丝技术，实现了具有强大的疲劳强度和光电性能的超柔性TiO 2 NFM。在350 nm光照下，2mol%Y3+掺杂的NFM基光电探测器在3 V电压下表现出优异的紫外探测性能，即响应率为4.5 A W-1，探测率为1.6 × 10（11）Jones，光电流约为1.6 μ A。通过有效地调节Y（3+）离子的分布和键合状态，NFM显示出显著增强的柔性，其中其原始光电流成功地保持在各种弯曲状态（角度、半径、螺旋状态）。重要的是，所得的Y3+掺杂的TiO 2NFM在约145度弯曲超过20000次后保持其原始光电流的约60%。在系统地分析了用有限元法得到的材料的微观组织特征和应力分布的基础上，提出了一种合理的原型，解释了有效的弯曲变形机制。最后，一个可穿戴的紫外监测系统，输出实时光电流信号与不同的运动组合的遥控机器人的演示。
Free-standing flexible TiO(2)nanofibrous membranes (NFMs) are highly desired for the construction of high-performance wearable electronic devices. Nevertheless, tremendous challenges still exist due to the fragile characteristics of the polycrystalline TiO(2)nanofibers. Here, ultra-flexible TiO2NFMs with robust fatigue strength and photoelectric properties are achieved via a simple element doping approach and the electrospinning technique. The 2 mol% Y3+-doped NFM-based photodetector exhibits excellent UV detecting performance at 3 V under 350 nm illumination, that is, responsivity of 4.5 A W-1, detectivity of 1.6 x 10(11)Jones, and photocurrent of approximate to 1.6 mu A. By effectively tuning the distribution and bonding state of Y(3+)ions, the NFM shows significantly enhanced flexibility, where its original photocurrent is successfully maintained in various bending states (angle, radius, spiral state). Importantly, the resultant Y3+-doped TiO2NFM maintains approximate to 60% of its original photocurrent after bending at approximate to 145 degrees for more than 20 000 times. A plausible prototype accounts for the effective bending deformation mechanism is proposed on the basis of the systematic analyses of the microstructural characteristics and the stress distribution achieved by using the finite element method. Finally, a wearable UV monitoring system that outputs real-time photocurrent signals with different motion combinations of the remote-controlled robot is demonstrated.