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Boosted photoresponsivity using silver nanoparticle decorated TiO2 nanowire/reduced graphene oxide thin-film heterostructure

机译:使用银纳米粒子装载光反应性,装饰TiO2纳米线/氧化石墨烯薄膜异质结构

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摘要

Here, we report on the fabrication and use of a silver (Ag) nanoparticle (NP) decorated TiO2 nanowire (NW)/reduced graphene oxide (RGO) thin-film (TF) heterostructure as a UV detector, using a controlled method called the glancing angle deposition technique. Transmission electron microscope images show Ag NPs (size 7-13 nm) covering the entire surface of the TiO2 NWs. A high absorption as well as photoluminescence for the Ag NP-TiO2 NW/RGO TF sample reveals the generation of a large number of electron-hole pairs compared to bare TiO2 NW. The resulting plasmonic UV photodetector from the Ag NP-TiO2 NW/RGO TF exhibits a rectification ratio of 5039 (+10 V) and responsivity of 1760 A W-1 at 350 nm light (with power density as low as 0.58 mu W cm(-2)). Moreover, the device shows fast response speed (rise time of 157 ms and fall time of 488 ms) with detectivity and noise equivalent power of 6.659 x 10(13) Jones and 51 fW, respectively. The enhanced plasmonic field and high scattering of light, along with the high mobility RGO layer at the bottom, result in the superior performance of the device.
机译:在这里,我们使用称为uV探测器的银(Ag)纳米粒子(NP)装饰的TiO2纳米线(NW)/薄膜(TF)薄膜(TF)异质结构的制造和使用作为UV探测器的制备和使用。瞥眼沉积技术。透射电子显微镜图像显示AG NPS(大小7-13nm)覆盖TiO2 NWS的整个表面。对于AG NP-TiO 2 NW / RGO样品的高吸收和光致发光显示,与裸TiO2 NW相比,将大量电子 - 孔对的产生产生。来自Ag NP-TiO2 NW / RGO TF的得到的等离子体UV光电探测器在350nm光(功率密度低至0.58μWWMWW),所得来自AG NP-TiO2 NW / RGO TF的整流比为5039(+ 10V)和1760A W-1的响应度( -2))。此外,该装置显示出快速响应速度(上升时间为157毫秒,下降时间为488毫秒),探测和噪声等效功率分别为6.659×10(13)琼斯和51 FW。增强的等离子体场和光的高散射,以及底部的高迁移率rgo层,导致装置的优异性能。

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