Shao Dali, Sun Hongtao, Gao Jian, Xin Guoqing, Aguilar Mark Anthony, Yao Tiankai, Koratkar Nikhil, Lian Jie, Sawyer Shayla
Department of Electrical, Computer and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Nanoscale. 2014 Nov 21;6(22):13630-6. doi: 10.1039/c4nr03921a.
We report fabrication of a flexible, thorn-like ZnO-multiwalled carbon nanotube (MWCNT) hybrid paper with high aspect ratio for efficient ultraviolet (UV) sensing and photocatalyst applications. The thorn-like ZnO-MWCNT hybrid paper was synthesized via atomic layer deposition (ALD) of a uniform ZnO thin film on the outside surface of the MWCNT followed by hydrothermal growth of ZnO branches. The hybrid paper achieved very high surface to volume ratio, which is favorable for photodetector and photocatalyst applications. A photodetector fabricated from the hybrid paper demonstrates a high sensitivity to UV light with a maximum photoresponsivity of 45.1 A W(-1) at 375 nm, corresponding to an external quantum efficiency as high as 14927%. The rise time and fall time of the UV photodetector are 29 ms and 33 ms, respectively, indicating fast transient response characteristics for the device. The high photoresponsivity and fast transient response are attributed to efficient carrier transport and collection efficiency of the hybrid paper. Besides, the thorn-like ZnO-MWCNT hybrid paper demonstrates excellent photocatalytic performance under UV irradiation, enabling photo-degradation of organic dyes such as Rhodamine B (RhB) within 90 minutes, with good recyclability.
我们报道了一种具有高纵横比的柔性刺状氧化锌-多壁碳纳米管（MWCNT）混合纸的制备，用于高效紫外线（UV）传感和光催化剂应用。刺状氧化锌-MWCNT混合纸是通过在MWCNT外表面采用原子层沉积（ALD）法沉积均匀的氧化锌薄膜，随后进行氧化锌分支的水热生长而合成的。该混合纸实现了非常高的表面积与体积比，这有利于光探测器和光催化剂应用。由该混合纸制成的光探测器对紫外光表现出高灵敏度，在375nm处的最大光响应度为45.1 A W⁻¹，对应的外量子效率高达14927%。该紫外光探测器的上升时间和下降时间分别为29ms和33ms，表明该器件具有快速瞬态响应特性。高光响应度和快速瞬态响应归因于混合纸高效的载流子传输和收集效率。此外，刺状氧化锌-MWCNT混合纸在紫外光照射下表现出优异的光催化性能，能够在90分钟内使罗丹明B（RhB）等有机染料发生光降解，且具有良好的可回收性。
