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  Nanogenerators for self-powered systems and piezotronics for active flexible electronics 
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講者:王中林
日期:2012/08/09
性質:演講
類別:應用科學、物質科學
語言:中文
長度:01:30:28
觀看:3,077
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摘要:
Developing wireless nanodevices and nanosystems is of critical importance for sensing, medical science, environmental/infrastructure monit...
Developing wireless nanodevices and nanosystems is of critical importance for sensing, medical science, environmental/infrastructure monitoring, defense technology and even personal electronics. It is highly desirable for wireless devices to be self-powered without using battery, without which most of the sensor network may be impossible. The piezoelectric nanogenerators developed by us have the potential to serve as self-sufficient power sources for mico/nano-systems. For Wurtzite structures that have non-central symmetry, such as ZnO, GaN and InN, a piezoelectric potential (piezopotential) is created in the crystal by applying a strain. The nanogenerator is invented by using the piezopotential as the driving force for electrons to flow in responding to a dynamic straining of piezoelectric nanowires. A gentle straining can produce an output voltage of up to 20-40 V from an integrated nanogenerator. Furthermore, piezopotential in the wurtzite structure can serve as a “gate” voltage that can effectively tune/control the charge transport across an interface/junction; electronics fabricated based on such a mechanism is coined as piezotronics, with applications in force/pressure triggered/controlled electronic devices, sensors, logic units and memory. By using the piezotronic effect, we show that the optoelectronc devices fabricated using wurtzite materials can have superior performance as solar cell, photon detector and light emitting diode. Piezotronic is likely to serve as a “mechanosensation” for directly interfacing biomechanical action with silicon based technology and active flexible electronics.

[1] Wang and Song, Science, 312 (2006) 242.
[2] Wang et al., Science, 316 (2007) 102.
[3] Qin et al., Nature, 451 (2008) 809.
[4] Yang et al., Nature Nanotechnology, 4 (2009) 34-39.
[6] Z.L. Wang, Nano Today 5 (2010) 540.
[7] Wu et al., Adv. Materials, 22 (2010) 4711.
[8] Hu et al., ACS Nano, 4 (2010) 1234.
[9] Yang et al., Nano Letters, 11 (2011) 4012.
[10] Z.L. Wang, Adv. Mater., DOI: 10.1002/adma.201104365.
[11] for details: www.nanoscience.gatech.edu

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