Towards Self‐Powered Nanosystems: From Nanogenerators to Nanopiezotronics

Developing wireless nanodevices and nanosystems are of critical importance for sensing, medical science, defense technology, and even personal electronics. It is highly desirable for wireless devices and even required for implanted biomedical devices that they be self‐powered without use of a battery. It is essential to explore innovative nanotechnologies for converting mechanical energy (such as body movement, muscle stretching), vibrational energy (such as acoustic or ultrasonic waves), and hydraulic energy (such as body fluid flow) into electrical energy, which will be used to power nanodevices without a battery. This is a key step towards self‐powered nanosystems. We have demonstrated an innovative approach for converting mechanical energy into electrical energy by piezoelectric zinc oxide nanowire (NW) arrays. The operation mechanism of the electric generator relies on the unique coupling of the piezoelectric and semiconducting properties of ZnO as well as the gating effect of the Schottky barrier formed between the metal tip and the NW. Based on this mechanism, we have recently developed a DC nanogenerator (NG) driven by the ultrasonic wave in a biofluid and a textile‐fiber‐based NG for harvesting low‐frequency mechanical energy. Furthermore, a new field, “nanopiezotronics”, has been developed, which uses coupled piezoelectric–semiconducting properties for fabricating novel and unique electronic devices and components. This Feature Article gives a systematic description of the fundamental mechanism of the NG, its rationally innovative design for high output power, and the new electronics that can be built based on a piezoelectric‐driven semiconducting process. A perspective will be given about the future impact of the technologies.

[1]  Zhong Lin Wang,et al.  Nanobelts of Semiconducting Oxides , 2001, Science.

[2]  Zhong Lin Wang,et al.  Spontaneous Polarization-Induced Nanohelixes, Nanosprings, and Nanorings of Piezoelectric Nanobelts , 2003 .

[3]  Yong Ding,et al.  Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts , 2004, Science.

[4]  Zhong Lin Wang,et al.  Piezoelectric Characterization of Individual Zinc Oxide Nanobelt Probed by Piezoresponse Force Microscope , 2004 .

[5]  Joseph A. Paradiso,et al.  Energy scavenging for mobile and wireless electronics , 2005, IEEE Pervasive Computing.

[6]  Peng Li,et al.  Growth of uniformly aligned ZnO nanowire heterojunction arrays on GaN, AlN, and Al0.5Ga0.5N substrates. , 2005, Journal of the American Chemical Society.

[7]  Gengfeng Zheng,et al.  Multiplexed electrical detection of cancer markers with nanowire sensor arrays , 2005, Nature Biotechnology.

[8]  Yong Ding,et al.  Conversion of Zinc Oxide Nanobelts into Superlattice-Structured Nanohelices , 2005, Science.

[9]  Zhong Lin Wang,et al.  Piezoelectric field effect transistor and nanoforce sensor based on a single ZnO nanowire. , 2006, Nano letters.

[10]  Ningsheng Xu,et al.  Dissolving Behavior and Stability of ZnO Wires in Biofluids: A Study on Biodegradability and Biocompatibility of ZnO Nanostructures , 2006 .

[11]  Zhong Lin Wang,et al.  Piezoelectric and semiconducting coupled power generating process of a single ZnO belt/wire. A technology for harvesting electricity from the environment. , 2006, Nano letters.

[12]  Zhong Lin Wang,et al.  Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays , 2006, Science.

[13]  Charles M. Lieber,et al.  Coaxial silicon nanowires as solar cells and nanoelectronic power sources , 2007, Nature.

[14]  Zhong Lin Wang.  Piezoelectric Nanostructures: From Growth Phenomena to Electric Nanogenerators , 2007 .

[15]  Jinhui Song,et al.  Integrated nanogenerators in biofluid. , 2007, Nano letters.

[16]  Jinhui Song,et al.  Nanowire Piezoelectric Nanogenerators on Plastic Substrates as Flexible Power Sources for Nanodevices , 2007 .

[17]  Zhong Lin Wang,et al.  Piezoelectric gated diode of a single zno nanowire , 2007 .

[18]  Zhong Lin Wang.  The new field of nanopiezotronics , 2007 .

[19]  Li-Wei Tu,et al.  Generation of electricity in GaN nanorods induced by piezoelectric effect , 2007 .

[20]  L. Tu,et al.  Erratum: “Generation of electricity in GaN nanorods induced by piezoelectric effect” [Appl. Phys. Lett.90, 063110 (2007)] , 2007 .

[21]  Zhong Lin Wang,et al.  Direct-Current Nanogenerator Driven by Ultrasonic Waves , 2007, Science.

[22]  Yulin Deng,et al.  Polymer functionalized piezoelectric-FET as humidity/chemical nanosensors , 2007 .

[23]  Jinhui Song,et al.  Nanowire and nanobelt arrays of zinc oxide from synthesis to properties and to novel devices , 2007 .

[24]  Zhong Lin Wang,et al.  Microfibre–nanowire hybrid structure for energy scavenging , 2008, Nature.

[25]  Jinhui Song,et al.  Piezoelectric potential output from ZnO nanowire functionalized with p-type oligomer. , 2008, Nano letters.

[26]  Yong Ding,et al.  Piezoelectric nanogenerator using CdS nanowires , 2008 .

[27]  Zhong Lin Wang,et al.  Self-powered nanotech. , 2008, Scientific American.

[28]  Zhong Lin Wang,et al.  Carrier density and Schottky barrier on the performance of DC nanogenerator. , 2008, Nano letters.

[29]  Zhong Lin Wang.  Oxide nanobelts and nanowires--growth, properties and applications. , 2008, Journal of nanoscience and nanotechnology.

[30]  Zhong-Lin Wang,et al.  Alternating the Output of a CdS Nanowire Nanogenerator by a White‐Light‐Stimulated Optoelectronic Effect , 2008 .

[31]  Zhong Lin Wang,et al.  Toward high output-power nanogenerator , 2008 .