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Microfibre–nanowire hybrid structure for energy scavenging

A Corrigendum to this article was published on 15 January 2009


A self-powering nanosystem that harvests its operating energy from the environment is an attractive proposition for sensing, personal electronics and defence technologies1. This is in principle feasible for nanodevices owing to their extremely low power consumption2,3,4,5. Solar, thermal and mechanical (wind, friction, body movement) energies are common and may be scavenged from the environment, but the type of energy source to be chosen has to be decided on the basis of specific applications. Military sensing/surveillance node placement, for example, may involve difficult-to-reach locations, may need to be hidden, and may be in environments that are dusty, rainy, dark and/or in deep forest. In a moving vehicle or aeroplane, harvesting energy from a rotating tyre or wind blowing on the body is a possible choice to power wireless devices implanted in the surface of the vehicle. Nanowire nanogenerators built on hard substrates were demonstrated for harvesting local mechanical energy produced by high-frequency ultrasonic waves6,7. To harvest the energy from vibration or disturbance originating from footsteps, heartbeats, ambient noise and air flow, it is important to explore innovative technologies that work at low frequencies (such as <10 Hz) and that are based on flexible soft materials. Here we present a simple, low-cost approach that converts low-frequency vibration/friction energy into electricity using piezoelectric zinc oxide nanowires grown radially around textile fibres. By entangling two fibres and brushing the nanowires rooted on them with respect to each other, mechanical energy is converted into electricity owing to a coupled piezoelectric–semiconductor process8,9. This work establishes a methodology for scavenging light-wind energy and body-movement energy using fabrics.

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Figure 1: Kevlar fibres coated with ZnO nanowires.
Figure 2: Design and electricity-generating mechanism of the fibre-based nanogenerator driven by a low-frequency, external pulling force.
Figure 3: Electric output of a double-fibre nanogenerator.
Figure 4: Output improvements.


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This research was supported by the DOE, the NSF, and Emory-Georgia Tech CCNE funded by the NIH.

Author Contributions Z.L.W., X.W. and Y.Q. designed the experiments; Y.Q. and X.W. performed the experiments; and Z.L.W. and X.W. analysed the data and wrote the paper. All authors discussed the results and commented on the manuscript.

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Correspondence to Zhong Lin Wang.

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The file contains Supplementary Figures S1-S8 with legends and Supplementary Notes. (PDF 1173 kb)

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This file contains Supplementary Movie 1. The movie relates to the experimental procedures described in the text. (MOV 4310 kb)

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Qin, Y., Wang, X. & Wang, Z. Microfibre–nanowire hybrid structure for energy scavenging. Nature 451, 809–813 (2008).

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