An Jianing, Le Truong-Son Dinh, Lim Chin Huat Joel, Tran Van Thai, Zhan Zhaoyao, Gao Yi, Zheng Lianxi, Sun Gengzhi, Kim Young-Jin
School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore.
Singapore Centre for 3D Printing School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore.
Adv Sci (Weinh). 2018 Jun 6;5(8):1800496. doi: 10.1002/advs.201800496. eCollection 2018 Aug.
The increasing demand for wearable optoelectronics in biomedicine, prosthetics, and soft robotics calls for innovative and transformative technologies that permit facile fabrication of compact and flexible photodetectors with high performance. Herein, by developing a single-step selective laser writing strategy that can finely tailor material properties through incident photon density control and lead to the formation of hierarchical hybrid nanocomposites, e.g., reduced graphene oxide (rGO)-zinc oxide (ZnO), a highly flexible and all rGO-ZnO hybrid-based photodetector is successfully constructed. The device features 3D ultraporous hybrid films with high photoresponsivity as the active detection layer, and hybrid nanoflakes with superior electrical conductivity as interdigitated electrodes. Benefitting from enhanced photocarrier generation because of the ultraporous film morphology, efficient separation of electron-hole pairs at rGO-ZnO heterojunctions, and fast electron transport by highly conductive rGO nanosheets, the photodetector exhibits high, linear, and reproducible responsivities to a wide range of ultraviolet (UV) intensities. Furthermore, the excellent mechanical flexibility and robustness enable the photodetector to be conformally attached to skin, thus intimately monitoring the exposure dosage of human body to UV light for skin disease prevention. This study advances the fabrication of flexible optoelectronic devices with reduced complexity, facilitating the integration of wearable optoelectronics and epidermal systems.
生物医学、假肢和软机器人技术对可穿戴光电子器件的需求不断增加，这就需要创新和变革性技术，以便能够轻松制造出高性能的紧凑型柔性光电探测器。在此，通过开发一种单步选择性激光写入策略，该策略可以通过控制入射光子密度精细地调整材料特性，并导致形成分级混合纳米复合材料，例如还原氧化石墨烯（rGO）-氧化锌（ZnO），成功构建了一种高度柔性且全基于rGO-ZnO混合材料的光电探测器。该器件的特征在于具有高光响应性的3D超多孔混合薄膜作为有源检测层，以及具有优异导电性的混合纳米薄片作为叉指电极。受益于超多孔薄膜形态增强的光载流子产生、rGO-ZnO异质结处电子-空穴对的有效分离以及高导电性rGO纳米片的快速电子传输，该光电探测器对广泛的紫外（UV）强度表现出高、线性且可重复的响应。此外，出色的机械柔韧性和坚固性使光电探测器能够贴合在皮肤上，从而密切监测人体对紫外线的暴露剂量以预防皮肤疾病。这项研究推进了具有降低复杂性的柔性光电器件的制造，促进了可穿戴光电子器件与表皮系统的集成。
