Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Energy harvesting for self-powered nanosystems

(a) Experimental setup and procedures for generating electricity by deforming a piezoelectric nanowire using a conductive AFM tip. (b) Output voltage image map of ZnO nanowire arrays. ZnO: Zinc oxide. Pt: Platinum. Si: Silicon. Ag: Silver. VL: Voltage. RL: Load resister. I: Current.
(a) Experimental setup and procedures for generating electricity by deforming a piezoelectric nanowire using a conductive AFM tip. (b) Output voltage image map of ZnO nanowire arrays. ZnO: Zinc oxide. Pt: Platinum. Si: Silicon. Ag: Silver. VL: Voltage. RL: Load resister. I: Current.

Abstract:
Energy from sources such as body movement or blood flow is converted to electrical energy by deforming piezoelectric semiconducting nanowires.

Energy harvesting for self-powered nanosystems

WA | Posted on March 26th, 2008

Developing novel technologies for wireless nanodevices and nanosystems is of critical importance for in situ, real-time and implantable biosensing and defense applications, and even wearable personal electronics. A nanodevice requires a power source, which may be provided directly or indirectly by a battery. But it is highly desirable for wireless devices to be self-powered. That requires exploring innovative nanotechnologies for converting mechanical, vibration, and hydraulic energy into electric energy for battery-free nanodevices.

We have demonstrated an innovative approach for converting mechanical energy into electricity using piezoelectric zinc oxide (ZnO) nanowires that can be grown on any substrate (e.g., metals, ceramics, polymers, and textile fibers) of any shape.1,2 Measurements were performed by an atomic force microscope (AFM) equipped with a platinum-coated silicon tip. In the AFM contact mode, a constant normal force of 5nN (nanonewtons) was maintained between the tip and the sample surface. The tip scanned over the top of the ZnO nanowires, bending and releasing them (see Figure 1). The operation of the electric generator relies on the unique combination of the piezoelectric and semiconducting properties of ZnO.

The output power can be increased by using a large number of nanowires to generate electricity. The performance of the nanogenerator can be dramatically improved by mechanically deforming the nanowires to generate power in an adaptable, mobile, and cost-effective way over a larger scale than the AFM can achieve. The nanowires must all generate electricity simultaneously and continuously, and the electricity generated must be collected and output effectively. In addition, the energy to be converted should be provided in the form of waves or vibrations in the environment to enable the nanogenerator to operate `independently' and wirelessly. We have developed an innovative approach that uses ultrasonic waves to drive a nanogenerator built from an array of vertically aligned ZnO nanowires.3,4

The experimental setup is shown schematically in Figure 2. An array of aligned ZnO nanowires is covered by a zigzag silicon electrode coated with platinum. The platinum coating not only enhances the conductivity of the electrode but also creates a Schottky contact at the interface with the ZnO that functions like a p-n junction or diode.

The nanowires were grown on gallium nitride substrates, which served as a common electrode for directly connecting with an external circuit. The asymmetric piezoelectric potential across the width of a ZnO nanowire and the Schottky contact between the metal electrode and the nanowire are the two key processes for creating, separating, preserving, and outputting the charges. A top electrode is designed to achieve the coupling process and to replace the role played by the AFM tip, and its zigzag trenches act as an array of aligned AFM tips. The DC nanogenerator is driven by ultrasonic waves. Once the wave is on, a nanogenerator measuring 2mm2 delivers a current output of 30nA. The design is new, cost-effective, and meets the stipulated requirements. The approach provides a basis for optimizing and improving the performance of the nanogenerator for its applications in nanotechnology.

The principle and technology demonstrated here have the potential to convert energy from mechanical movement (such as body motion, muscle stretching, and blood pressure), vibrations (such as acoustic and ultrasonic waves), and hydraulic movement (such as flow of body fluid and blood, or contraction of blood vessels) into electrical energy to power nanodevices and nanosystems. Relevant applications include implantable biosensing, wireless and remote sensing, nanorobotics, microelectromechanical systems, and sonic wave detection.

This research was supported by the National Science Foundation, NASA, the Defense Research Projects Agency, and the National Institutes of Health. Thanks to Xudong Wang, Jinhui Song, and Jin Liu for their contribution.
Zhong Lin (Z.L.) Wang
Georgia Institute of Technology
Atlanta, GA

Zhong Lin Wang is a Regents' Professor and COE Distinguished Professor at Georgia Tech. He has authored and coauthored 4 scientific references and textbooks, published over 500 peer-reviewed journal articles, 55 review papers and book chapters, edited and coedited 14 volumes on nanotechnology, and holds 20 patents and provisional patents. His publications have been cited over 19,000 times. He has an H-index of 67. He was elected a fellow of the American Physical Society in 2005 and of the American Association for the Advancement of Science in 2006. He has received the 2001 S. T. Li Prize for an Outstanding Contribution in Nanoscience and Nanotechnology, the 2000 and 2005 Georgia Tech Outstanding Faculty Research Author Awards, the 2005 Sigma Xi Scientific Research Society Sustained Research Award, the 1998 and 2002 Sigma Xi Best Paper Awards, and the 1999 Burton Medal from the Microscopy Society of America.
References:
1. Z. L. Wang, J. H. Song, Piezoelectric nanogenerators based on zinc oxide nanowire arrays, Science 312, pp. 242, 2006.
2. P. X. Gao, J. H. Song, J. Liu, Z. L. Wang, Nanowire nanogenerators on plastic substrates as flexible power source, Adv. Mater. 19, pp. 67, 2007.
3. X. D. Wang, J. H. Song, J. Liu, Z. L. Wang, Direct current nanogenerator driven by ultrasonic wave, Science 316, pp. 102, 2007.
4. X. Wang, J. Liu, J. Song, Z. L. Wang, Integrated nanogenerators in bio-fluid, Nano Lett. 7, pp. 2475, 2007.

####

For more information, please click here

Copyright © SPIE

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Sensors

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanosensor Used for Simultaneous Determination of Effective Tea Components January 24th, 2015

Iranian Scientists Produce Graphene-Based Oxygen Sensor January 23rd, 2015

Announcements

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Military

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

Scientists 'bend' elastic waves with new metamaterials that could have commercial applications: Materials could benefit imaging and military enhancements such as elastic cloaking January 23rd, 2015

Laser-generated surface structures create extremely water-repellent metals: Super-hydrophobic properties could lead to applications in solar panels, sanitation and as rust-free metals January 20th, 2015

Energy

Visualizing interacting electrons in a molecule: Scientists at Aalto University and the University of Zurich have succeeded in directly imaging how electrons interact within a single molecule January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

New technique helps probe performance of organic solar cell materials January 23rd, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE