Developing multiple functionalities in nanodevices is a desirable objective in current nanotechnology, where the self-powered capability is one of the most demanded functions—without the need of external batteries, nanodevices can be operated independently and maintenance-free for a long period of time. In this study, we fabricated the core-shell nanostructured device employing multi-walled carbon nanotubes (CNTs) as inner cores and ZnO as outer shells, and demonstrate their multiple functionalities of fast UV detection and self-powered capability. The device features high photoconductive gain of 800 and short response time of 0.48 ms in air and 29 ms in vacuum. For energy harvesting, the device shows photovoltaic (PV) capability to drive a conventional liquid crystal display (LCD) with a V_oc of 0.85 V and I_sc of 5 nA. Those features demonstrate that our CNT-ZnO core-shell nanostructured device, performing both high photoresponsivity and PV capability, can be operated in different functionalities with or without external bias.

在纳米设备中开发多种功能是当前纳米技术的一个理想目标，在纳米技术中，自供电功能是最需要的功能之一-无需外部电池，纳米设备可以长期独立运行且无需维护。在这项研究中，我们制造了以多壁碳纳米管（CNTs）为内芯和ZnO为外壳的核-壳纳米结构器件，并展示了其快速紫外线检测和自供电能力的多种功能。该器件具有800的高光电导增益，在空气中的响应时间短，在空气中为0.48 ms，在真空中的响应时间为29 ms。对于能量收集，该设备具有光伏（PV）功能，可驱动V _oc的常规液晶显示器（LCD）0.85 V的_Isc和5 nA的I _sc。这些特征表明，我们的CNT-ZnO核壳纳米结构器件既具有高光响应性又具有PV能力，可以在有或没有外部偏压的情况下以不同的功能运行。