Self-powered nanowire devices
Self-powered nanowire devices
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DOI：
10.1038/nnano.2010.46
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发表时间：
2010-05-01
影响因子：
38.3
通讯作者：
Wang, Zhong Lin
中科院分区：
文献类型：
--
作者：
Xu, Sheng;Qin, Yong;Wang, Zhong Lin
从环境源收集机械能可以为电气设备供电，而不需要电池。但是，尽管收集材料如压电纳米线的效率和耐用性已经稳步提高，但单个纳米线产生的电压和功率对于真实的器件来说是不够的。因此，将大量纳米线能量收集器集成到单个电源中是必要的，这需要纳米线的对齐以及它们的充电和放电过程的同步。在这里，我们展示了垂直和横向集成的ZnO纳米线阵列，能够产生足够的功率来操作真实的设备。700行ZnO纳米线的横向集成在0.19%的低应变下产生1.26 V的峰值电压，这可能足以对AA电池再充电。在一个单独的器件中，三层ZnO纳米线阵列的垂直集成产生了2.7 mW cm（-3）的峰值功率密度。我们使用的垂直集成的纳米发电机的纳米线pH传感器和纳米线紫外线传感器，从而展示了一个自供电系统完全由纳米线。
The harvesting of mechanical energy from ambient sources could power electrical devices without the need for batteries. However, although the efficiency and durability of harvesting materials such as piezoelectric nanowires have steadily improved, the voltage and power produced by a single nanowire are insufficient for real devices. The integration of large numbers of nanowire energy harvesters into a single power source is therefore necessary, requiring alignment of the nanowires as well as synchronization of their charging and discharging processes. Here, we demonstrate the vertical and lateral integration of ZnO nanowires into arrays that are capable of producing sufficient power to operate real devices. A lateral integration of 700 rows of ZnO nanowires produces a peak voltage of 1.26 V at a low strain of 0.19%, which is potentially sufficient to recharge an AA battery. In a separate device, a vertical integration of three layers of ZnO nanowire arrays produces a peak power density of 2.7 mW cm(-3). We use the vertically integrated nanogenerator to power a nanowire pH sensor and a nanowire UV sensor, thus demonstrating a self-powered system composed entirely of nanowires.