subject: Nano-technology start a new life the extensive application of piezoelectric sensors - nano piezoelectric sensor - Electrical industry [print this page] Nano-technology start a new life the extensive application of piezoelectric sensors - nano piezoelectric sensor - Electrical industry
Nano-sensor has a keen sensitivity, the volume is also very small. Electrical observation
Lot of their usefulness, such as blood diseases, molecular detection of signs; detection of toxic gases in the air; trace contaminants in food, etc.. But to be completely miniaturization of these devices, batteries and integrated circuits has become the stumbling block. Georgia Institute of Technology materials scientist Professor Wang Zhonglin invention of miniature piezoelectric Generator To bring a new nano-world power. If he can be successful, biological and chemical nano Sensor In the future will be able to own their own power supply.
Early as a century ago, people have known the existence of the piezoelectric effect, that is crystal materials can produce mechanical pressure potential. But in 2005, Zhong-Lin Wang for the first time to demonstrate the piezoelectric effect of nano-level. He used atomic force microscopy probe tip to bend a single ZnO nanowires, when the nanowires bend and back to the original shape when the zinc and oxygen ions by the electric potential can drive current. In the first trial, Professor Wang induce tiny electric potential only a few millivolts. But he is convinced that as long as a sufficient number of experiments, he will be able to design a practical nano Power supply Such Power supply Can even use small vibration around us, such as sound waves, wind and even the implanted device fluctuations in blood flow. These subtle changes will bend nanowires to produce electricity.
Last November, Professor Wang polymer embedded in a layer of zinc oxide nanowires, resulting in a potential of 50 mV, which is in the micro- Sensor Power technology development on an important step forward.
Zhong-Lin Wang hope that these fat Motor Eventually be woven into the fibers, such a shirt issued by the iPod power enough to recharge portable devices such as portable. Of course, nano hair Motor The output power is too low, it can not do this. Professor Wang said that the need for 200 mV or even more potential, he plans to approach the nanowires through the stack to achieve, but it still needs a 5 to 10 years of well-designed.
At the same time, Zhong-Lin Wang has demonstrated a new nano-sensor of the first component. He called the piezoelectric technology makes use of nanotechnology to the fact that both of zinc oxide nanowires show a piezoelectric effect is also a semiconductor. The first feature made of zinc oxide nanowires to play the role of mechanical sensors, as they respond to mechanical stress to produce electricity; second characteristic means that they can be used to produce the basic components of integrated circuits, including transistors and diodes. Unlike traditional Electronic Components, nano-piezoelectric element does not require external power, they exposed to the same nano-generator-powered mechanical stress, the self will be able to generate electricity. Once the nano-piezoelectric elements
external power supply from the shackles, it is possible to open up a variety of practical applications. An integrated nano-generators can be used in nano-piezoelectric hearing aid of multiple nanowires, each root can be tuned to a variety of different sound frequencies. Nanowires convert sound waves into electrical signals and processed so that they can be directly transmitted to the brain neurons. This implanted neural prosthesis is not only more compact than traditional hearing aids, more sensitive, but also due to replace the battery without the removal of. Nano piezoelectric sensor can also be used to test aircraft engines in the mechanical stress, just a few nano-wire device can monitor the pressure, process information and to inform the flight data computer. Whether in the body or in the air, nano devices will eventually be all over the world around us.
