19-07-2011, 03:06 PM
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NANO-PIEZOTRONICS
INTRODUCTION
Nano-piezotronics is an emerging field of nano-technology coined
In this technique, coupled of piezoelectric and semi-conducting property of nanowires and nanobelts for designing and fabricating to introduce electronic devices such as nanotransistors and nanodiodes.
PIEZOTRONICS
Field of using coupled piezotronics semi conducting properties.
Fabricated novel and unique electronic devices and components.
NANOWIRES
Wires of dimensions about 100nm.
Random growing Zno nanowire in substrate
PIEZO-ELECTRIC EFFECT
A piezoelectric substance is one that produces an electric charge when a mechanical stress is applied.
A mechanical deformation is produced when an electric field is applied.
EXPERIMENTAL BRIEF
An innovative approach for conversion of nanoscale mechanical energy to electrical energy.
Device-Piezoelectric zinc oxidnano (zno) nanowire(nw) arrays.
The mechanical energy created by deflection forces was converted to electricity.
OPERATING PRINCIPLE
Under the straining created by an external force, a piezoelectric potential is created in the nanowire as result of elastic deformation, which drives the flow of charge carriers through an external load. A schottky barrier arise between the electrode and nanowire serves as n GATE that controls the flowing directions of charge carrier.
Nanopiezotronics converts heartbeat and breathing into electricity
the conversion of biomechanical energy into electricity by a muscle-movement-driven nanogenerator to harvest mechanical energy from body movement under in vitroconditions.
Implanting of a nanogenerator in a live rat to harvest energy generated by its breath and heartbeat.
WORKING
The nano-piezotronic mechanism takes advantage of the fundamental property of nanowires .
Bending the structures creates a charge separation – positive on one side and negative on the other.
The connection between bending and charge creation has also been used to create electrical currents when a zinc oxide nanowires is bent and then released
COMPARISION
conventional FET
electrical potential – called the gate voltage – is applied to create an electrical field that controls the flow of current between the device's source and its drain.
Piezo transistor
the current flow is controlled by bending it between the source and drain electrodes. The bending produces a "gate" potential and the resulting conductance is directly related to the degree of bending applied.
OUTPUT
Reproduce highly repeated AC current output ,somewhat like this
ADVANTAGES/APPLICATIONS
Piezotronic nanosensors can measure Nano-Newton (10-9) forces by examining the shape of the structure under pressure.
Implantable sensors based on the principle could continuously measure blood pressure inside the body and relay the information wirelessly to an external device.
The device could be powered by a nanogenerator harvesting energy from blood flow.
Zinc oxide materials are biocompatible, allowing their use in the body without toxic effects.
Other nanosensors can detect very low levels of specific compounds by measuring the current change created when molecules of the target are adsorbed to the nanostructure's surface.
NANO-PIEZOTRONICS
INTRODUCTION
Nano-piezotronics is an emerging field of nano-technology coined
In this technique, coupled of piezoelectric and semi-conducting property of nanowires and nanobelts for designing and fabricating to introduce electronic devices such as nanotransistors and nanodiodes.
PIEZOTRONICS
Field of using coupled piezotronics semi conducting properties.
Fabricated novel and unique electronic devices and components.
NANOWIRES
Wires of dimensions about 100nm.
Random growing Zno nanowire in substrate
PIEZO-ELECTRIC EFFECT
A piezoelectric substance is one that produces an electric charge when a mechanical stress is applied.
A mechanical deformation is produced when an electric field is applied.
EXPERIMENTAL BRIEF
An innovative approach for conversion of nanoscale mechanical energy to electrical energy.
Device-Piezoelectric zinc oxidnano (zno) nanowire(nw) arrays.
The mechanical energy created by deflection forces was converted to electricity.
OPERATING PRINCIPLE
Under the straining created by an external force, a piezoelectric potential is created in the nanowire as result of elastic deformation, which drives the flow of charge carriers through an external load. A schottky barrier arise between the electrode and nanowire serves as n GATE that controls the flowing directions of charge carrier.
Nanopiezotronics converts heartbeat and breathing into electricity
the conversion of biomechanical energy into electricity by a muscle-movement-driven nanogenerator to harvest mechanical energy from body movement under in vitroconditions.
Implanting of a nanogenerator in a live rat to harvest energy generated by its breath and heartbeat.
WORKING
The nano-piezotronic mechanism takes advantage of the fundamental property of nanowires .
Bending the structures creates a charge separation – positive on one side and negative on the other.
The connection between bending and charge creation has also been used to create electrical currents when a zinc oxide nanowires is bent and then released
COMPARISION
conventional FET
electrical potential – called the gate voltage – is applied to create an electrical field that controls the flow of current between the device's source and its drain.
Piezo transistor
the current flow is controlled by bending it between the source and drain electrodes. The bending produces a "gate" potential and the resulting conductance is directly related to the degree of bending applied.
OUTPUT
Reproduce highly repeated AC current output ,somewhat like this
ADVANTAGES/APPLICATIONS
Piezotronic nanosensors can measure Nano-Newton (10-9) forces by examining the shape of the structure under pressure.
Implantable sensors based on the principle could continuously measure blood pressure inside the body and relay the information wirelessly to an external device.
The device could be powered by a nanogenerator harvesting energy from blood flow.
Zinc oxide materials are biocompatible, allowing their use in the body without toxic effects.
Other nanosensors can detect very low levels of specific compounds by measuring the current change created when molecules of the target are adsorbed to the nanostructure's surface.