Nanogenerator
IFET COLLEGE OF ENGINEERING
“NANOGENERATORS”
PRESENTED BY
R.VINEETH P.BALAJI III year B.E.,EEE., III year B.E.,EEE.,
Mail id:vineethrjn@gmail.com
ABSTRACT Our body produces energy in various forms. Just a small fraction of this energy is sufficient to power implanted medical devices like pacemakers. When we take a closer look at the tiny power plants, harnessing the energy of our body we could find nanotechnology has huge potential to achieve this. Nano size machines will need a power source, that is better than batteries and measures just billionths of a meter. Arrays of piezoelectric nano wires could capture and transmit that waste to nano devices. These power plants are called “Nanogenerators”. It is found that when an atomic force microscope (AFM) bends a straight, vertical nanowire; a strain field is established, with the stretched surface showing positive strain and the compressed surface showing negative strain. As the tip of the AFM scans over the nano wires for each contact position there is voltage varying from 0-6.5mv. The piezoelectric effect creates an electric electric field inside the nanowires 's volume. A rectangular electrode with ridged underside sits atop the nanowires and moves side to side in response to external forces such as vibration, human pulse and acoustic waves. The human body is a source of power, a small fraction of this energy when converted into electricity is sufficient to power many types of nanodevices. Other than body movement , various routes are being tried by researchers for power generations on mini scale. Medical devices are likely to be a major application for nanogenerators. Using these tiny power plants, autonomous strain sensors for structures like bridges and environmental sensors for toxin detection could also be
“NANOGENERATORS”
PRESENTED BY
R.VINEETH P.BALAJI III year B.E.,EEE., III year B.E.,EEE.,
Mail id:vineethrjn@gmail.com
ABSTRACT Our body produces energy in various forms. Just a small fraction of this energy is sufficient to power implanted medical devices like pacemakers. When we take a closer look at the tiny power plants, harnessing the energy of our body we could find nanotechnology has huge potential to achieve this. Nano size machines will need a power source, that is better than batteries and measures just billionths of a meter. Arrays of piezoelectric nano wires could capture and transmit that waste to nano devices. These power plants are called “Nanogenerators”. It is found that when an atomic force microscope (AFM) bends a straight, vertical nanowire; a strain field is established, with the stretched surface showing positive strain and the compressed surface showing negative strain. As the tip of the AFM scans over the nano wires for each contact position there is voltage varying from 0-6.5mv. The piezoelectric effect creates an electric electric field inside the nanowires 's volume. A rectangular electrode with ridged underside sits atop the nanowires and moves side to side in response to external forces such as vibration, human pulse and acoustic waves. The human body is a source of power, a small fraction of this energy when converted into electricity is sufficient to power many types of nanodevices. Other than body movement , various routes are being tried by researchers for power generations on mini scale. Medical devices are likely to be a major application for nanogenerators. Using these tiny power plants, autonomous strain sensors for structures like bridges and environmental sensors for toxin detection could also be
References: 1.www.eetimes.com, 2.www.EFY.com. ----------------------- [pic] A scanning electron microscope image (top) shows an array of zinc oxide nanowires. Middle image shows a schematic of how an AFM tip was used to bend nanowires to produce current. Bottom image depicts output voltages produce by the array as it is scanned by the probe.