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Tags: NANOGENERATORS, piezoelectric nanogenerators based on zinc oxide nanowire arrays, nanogenerators could provide, nanogenerators convert mechanical energy, piezoelectric nanogenerators for self powered nanodevices, nanogenerators ppt, nanogenerators pdf, nano generators, hamsters on treadmills provide electricity through use of nanogenerators, NANOGENERATORS ppt, NANOGENERATORS pdf, nanogenerator applications,
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04-03-2010, 12:47 PM
Post: #1
NANOGENERATORS
NANOGENERATORS
ABSTRACT
Power is always an essential attrocity, and the need for same remains an un-ending requirement .On the wheel of development of todayâ„¢s multifaceted technology, newer methods are invented with a phenomenal pace .Generation of power is thus a technological infrastructure that needs to be updated in par with the inventions. Here ,a newer class of generators are being introduced. In accordance to the miniaturization trend a miniature power generator namely, Nanogenerator. Small scale electrical generator includes an elongated substrate and a first piezoelectric fine wire. The first piezoelectric fine wire is disposed along a surface of the substrate. The first piezoelectric fine wire has a first end and a spaced-apart second end. A first conductive contact secures the first end of the fine wire to a first portion of the substrate and a second conductive contact secures the second end of the fine wire to a second portion of the substrate. A fabric made of interwoven strands that includes fibers from which piezoelectric nanowires extend radially therefrom and conductive nanostructure, which constitute the prima of a nanogenerator.This includes a first conductive layer, a plurality of semiconducting piezoelectric nanostructures, a second conductive layer and a plurality of conductive nanostructures. The first conductive layer has a first surface from which the semiconducting piezoelectric nanostructures extend. The second conductive layer has a second surface and is parallel when a force is applied, the semiconducting piezoelectric nanostructures engage the conductive nanostructures so that the piezoelectric nanostructures bend, thereby generating a potential difference across the semiconducting piezoelectric nanostructures and also thereby forming a Schottky barrier between the semiconducting piezoelectric nanostructures and the conductive nanostructures.
17-07-2010, 11:35 AM
Post: #2
RE: NANOGENERATORS
full report of nanogenerators
16-09-2010, 01:33 PM
Post: #3
RE: NANOGENERATORS
pls send me the report
abhijithchandran[at]rocketmail.com
31-03-2011, 11:47 AM
Post: #4
RE: NANOGENERATORS
Presented By
T.Arun


.docx  nanogenerator.docx (Size: 455.5 KB / Downloads: 347)
Abstract
Materials Science research is now entered a new phase where the structure and properties of materials are investigated, characterized and controlled at the nano scale. Today's portable electronics depend on batteries for power. Batteries and other traditional sources are too large, and tend to negate the size advantages of nano devices. Now researchers have demonstrated that easy-to-make, inexpensive nanowires can harvest mechanical energy, to overcome these challenges researches are finding alternative ways, and nano generator is one promising answer. A nano generator take advantage of unique coupled piezoelectric & semi conducting properties of zinc oxide nano structure (wires), which produce small electrical charges when they are flexed. By finding a way to collect electricity from multiple nano wires, the researchers took a big step toward a practical nano -scale power generator. When you walk, you generate 67 watts. Your finger movement is 0.1 watt. Your breathing is one watt. If you can convert a fraction of that, you can power a device. From the concept we've demonstrated, we can convert 17-30 percent of that energy. Consequently, researchers are developing innovative technologies to convert various forms of energy into electrical energy for low power nano devices. In this paper the piezoelectric zinc oxide nano wire arrays are used to demonstrate a novel approach for converting nano mechanical energy into electrical energy.
2. Introduction
2.1 Overview

Nanotechnology is a field whose theme is the control of matter on an atomic and molecular scale, nanotechnology deals with structures of the size 100 nanometers or smaller. Nanotechnology is extremely diverse ranging from novel extensions of conventional device physics. Nanogenerator is a prototype nanometer-scale generator that produces continuous direct-current electricity by harvesting mechanical energy from such environmental sources as ultrasonic waves, mechanical vibration or blood flow. Based on arrays of vertically-aligned zinc oxide nano wires that move inside a novel “zig-zag” plate electrode, the nanogenerators could provide a new way to power nanoscale devices without batteries or other external power sources.
Nanogenerator is an energy harvesting device converting the external kinetic energy into an electrical energy based on the energy conversion by nano-structured piezoelectric material. Although its definition may include any types of energy harvesting devices with nano-structure converting the various types of the ambient energy, it is used in most of times to specifically indicate the kinetic energy harvesting devices utilizing nano-scaled piezoelectric material after its first introduction in 2006.
Although still in the early stage of the development, it has been regarded as a potential breakthrough toward the further miniaturization of the conventional energy harvester, possibly leading the facile integration with the other types of energy harvester converting the different types of energy and the independent operation of mobile electronic devices with the reduced concerns for the energy source, consequently.
Over the past decades, intensive research efforts have been carried out in developing energy harvesting system for portable and wireless applications. In particular, piezoelectric generator offers the most robust and simple solutions for mechanical energy harvesting. The main advantage of piezoelectric generator is its scalability. This is why the recent reports of energy harvesting from the environment using ZnO nanowire arrays have attracted great interests by scaling down the power source to nanoscale. PVDF stands for Poly (vinylidene fluoride). PVDF is a highly non -reactive, flexible, inexpensive, and leading polymer with good piezoelectric property. However, it must first be stretched and poled in a strong electrical field for its piezoelectricity. In this work, we present a direct-write technology to produce and place piezoelectric PVDF nanofibers at the same time with the in -situ poling and mechanical stretching process simultaneously as the foundation for nanogenerators .
2.2 Why nanogenerator is required?
• Materials Science research is now entered a new phase where the structure and properties of materials are investigated, characterized and controlled at the nano scale.
• Though as sophisticated as their larger counterparts, these devices are still burdened because they rely on an outside power.
• Batteries and other traditional sources are too large, and tend to negate the size advantages of nano devices.
• To overcome these challenges researches are finding alternative ways, and nano generator is one promising answer.
• A nano generator take advantage of unique coupled piezo electric & semi conducting properties of zinc oxide nano structure (wires), which produce small electrical charges when they are flexed.
• By finding a way to collect electricity from multiple nano wires, the researchers took a big step toward a practical nano-scale power generator.
3. Nanogenerator construction/ fabrication
The Nanogenerator is constructed with an electrode lowered on top of the nanowire array, leaving just enough space so that a significant number of the nanowires are free to flex within the gaps created by the tips. Moved by the mechanical energy such as waves or
vibration, the nanowires periodically contact the tips, transferring their electrical charges. By capturing the tiny amounts of current produced by hundreds of nanowires kept in motion, the generators produce a direct current output in the nano-Ampere range. The Nanogenerator could produce as much as 4 watts per cubic centimeter- based on a calculation for a single nanowire. The Nanogenerator would produce enough power to operate nanometer scale defense, environmental and biomedical applications, including biosensors implanted in the body, environmental monitors, and even nanoscale robots. April 14, 2006 issue of the journal Science, Wang’s research team announced the concept behind the nanogenerators. At the time the Nanogenerator could harvest power from just one nanowire at a time by dragging the tip of an atomic force microscope over it. Made of platinum coated silicon, the tip served as a schottky barrier, helping accumulate and preserve the electrical charge as the nanowire flexed and ensuring that the current flowed in one direction.
09-01-2012, 07:08 PM
Post: #5
RE: NANOGENERATORS
sir plz send me on hybrid electric vehicle ppt to my mail at shaikzahir.zahir[at]gmail.com
10-01-2012, 09:51 AM
Post: #6
RE: NANOGENERATORS
to get information about the topic"NANOGENERATORS" refer the link bellow

http://www.seminarprojects.com/Thread-na...3#pid61283
19-03-2012, 01:52 PM
Post: #7
RE: NANOGENERATORS
hi i wanna want the seminar report on nanogenerator.. plz send..
02-04-2012, 12:26 PM
Post: #8
RE: NANOGENERATORS
to get information about the topic "nanowires and nanogenerators" full report ppt and related topic refer the link bellow

http://seminarprojects.com/Thread-nanogenerators?page=2

http://seminarprojects.com/Thread-nanogenerators
15-05-2012, 12:22 PM
Post: #9
RE: NANOGENERATORS ppt
Nanogenerator


.docx  Nanogenerator.ppt.docx (Size: 244.82 KB / Downloads: 30)

Mechanism

Working principle of nanogenerator where an individual nanowire is subjected to the force exerted perpendicular to the growing direction of nanowire. (a) An AFT tip is swept through the tip of the nanowire. Only negatively charged portion will allow the current to flow through the interface. (b) The nanowire is integrated with the counter electrode with AFT tip-like grating. As of (a), the electrons are transported from the compressed portion of nanowire to the counter electrode because of Schottky contact.

Working principle of nanogenerator where an individual nanowire is subjected to the force exerted parallel to the growing direction of nanowire
The working principle of nanogenerator will be explained for 2 different cases: the force exerted perpendicular and parallel to the axis of the nanowire.

Geometrical Configuration

Depending on the configuration of piezoelectric nanostructure, the most of the nanogenerator can be categorized into 3 types: VING, LING and "NEG". Still, there is a configuration that do not fall into the aforementioned categories, as stated in other type.
Vertical nanowire Integrated Nanogenerator (VING)


Lateral nanowire Integrated Nanogenerator (LING)


Schematic view of typical Lateral nanowire Integrated Nanogenerator
LING is a 2-dimensional configuration consisting of three parts: the base electrode, the laterally grown piezoelectric nanostructure and the metal electrode for schottky contact. In most of cases, the thickness of the substrate film is much thicker than the diameter of the piezoelectric nanostructure, so the individual nanostructure is subjected to the pure tensile strain.
LING is an expansion of single wire generator (SWG), where a laterally aligned nanowire is integrated on the flexible substrate. SWG is rather a scientific configuration used for verifying the capability of electrical energy generation of a piezoelectric material and is widely adopted in the early stage of the development.
As of VINGs with full mechanical contact, LING generates AC electrical signal. The output voltage can be amplified by constructing an array of LING connected in series on the single substrate, leading the constructive addition of the output voltage. Such a configuration may lead to the practical application of LING for scavenging large-scale power, for example, wind or ocean waves.

Nanocomposite Electrical Generators (NEG)


Schematic view of typical Nanocomposite Electrical Generator
"NEG" is a 3-dimensional configuration consisting three main parts: the metal plate electrodes, the vertically grown piezoelectric nanostructure and the polymer matrix which fills in between in the piezoelectric nanostructure.
NEG was introduced by Momeni et al.[7] It was shown that NEG has a higher efficiency compared to original nanogenerator configuration which a ZnO nanowire will be bended by an AFM tip. It is also shown that it provides an energy source with higher sustainability.



Schematic view of typical Vertical nanowire Integrated Nanogenerator, (a) with full contact, and (b) with partial contact. Note that the grating on the counter electrode is important in the latter case.
VING is a 3-dimensional configuration consisting of a stack of 3 layers in general, which are the base electrode, the vertically grown piezoelectric nanostructure and the counter electrode. The piezoelectric nanostructure is usually grown from the base electrode by various synthesizing techniques, which are then integrated with the counter electrode in full or partial mechanical contact with its tip.
20-06-2012, 11:50 AM
Post: #10
RE: NANOGENERATORS
to get information about the topic "NANOGENERATORS" full report ppt and related topic refer the link bellow

http://www.seminarprojects.com/Thread-nanogenerators

http://www.seminarprojects.com/attachment.php?aid=11399
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