Sound waves are everywhere, such as various social events where people are located, airports, construction sites and traffic. Usually, these sounds are considered as noise that pollutes our living environment. Although the energy provided by it is full of our entire environment, it is often overlooked and wasted. If these energy can be collected and used, a new and sustainable source of energy will be obtained. At present, acoustic energy collection is not universal. Compared with other types of energy (such as solar energy and thermoelectric energy), acoustic energy has low power density and is difficult to collect and use. At present, piezoelectric and electrostatic effects are used to realize the acoustic energy collection technology. There are disadvantages such as low energy conversion efficiency, complex structure, and high material quality requirements, and most devices have high operating frequencies (from several kHz to MHz), and daily life The sound sources used in this case are mainly low-frequency components, so that the existing technologies and devices are not actually used. Therefore, collecting acoustic energy is still a challenge. In 2012, the Institute of Nano Energy and Systems of the Chinese Academy of Sciences under the leadership of Academician Wang Zhonglin and the Georgia Institute of Technology team proposed the concept of triboelectric nano-generator for the first time, which opened up a new category of energy conversion and application. Triboelectricity is a very common phenomenon that exists in all aspects of our daily lives. Trickle electricity is generated from many activities such as one touch, walking and driving. Wang Zhonglin’s research group led by reasonable device structure design makes the ancient phenomenon of frictional electrification exhibit original and unprecedented application value and potential. In the two years or so, under the leadership of Wang Zhonglin, various types of triboelectric nano-generators have been continuously developed, presenting people with a splendid new world and attracting extensive attention from all walks of life at home and abroad. The relevant achievements were published in Nano Energy, Nano Letter, Advanced Materials, ASC Nano, Energy & Environmental Science and other famous journals. Recently, under the leadership of Wang Zhonglin, a research team composed of Dr. Yang Jin and Dr. Chen Jun for the first time realized high-efficiency sound power generation using the friction effect. They affixed a Teflon film coated with a metal electrode and a metal electrode film with a hole structure together to form a triboelectric nanogenerator and used in acoustic conversion sensitive units. The PTFE film produced is light and thin, flexible, and able to produce different degrees of separation and contact friction with the metal electrode film while achieving a response to environmental sound pressure changes, resulting in a balance relationship between surface friction charges and induced charges. Changes occur, so that the driving electrons transfer through the external circuit, that is to form a current, to achieve the conversion of acoustic energy to electrical energy. In order to improve the acoustic energy conversion efficiency, the research group from 1) the initial stress of the PTFE membrane and the ratio of the metal electrode pore area, 2) the acoustic resonator structure, 3) the PTFE membrane surface nanowires and the metal electrode membrane surface nanoholes The device was optimized in three directions such as trimming. Experimental results show that when the sound pressure is in the range of 70 dB to 110 dB, the acoustic response sensitivity of the device reaches 9.54 V Pa-1, the peak power density is 60.2 mW m-2, and the sound and electricity conversion efficiency is greater than 50%. The sound-driven triboelectric nanogenerator can light up 20 LED lights at the same time. The research team also made self-powered microphones through multiple device arrays with different frequency response bands to achieve passive, wide-band voice recording; using passive multi-sound sensors to construct passive and active sound source positioning systems that can locate sound source positions in real time. . The work was published in the latest issue of ASC Nano (DOI: 10.1021/nn4063616, Publication Date (Web): February 13, 2014). The results of the study were focused on the efficient collection of ambient acoustic energy, noise suppression, and acoustic transmission. Sensing detection (such as aerodynamic sound sensing, military investigation, and personal electronic equipment) has broad application prospects. The entire device manufacturing process requires no expensive raw materials and advanced manufacturing equipment, which is conducive to large-scale industrial production and practical applications. The entire device is based on a flexible polymer film and is easy to process. The device has a long service life and is easy to process with other processes. Fusion.
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