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TENG drive 3D network cold cathode schematic
The vacuum electron emitters with field emission cold cathodes as the electron source have the characteristics of simple structure, fast response, no radiation and anti-jamming, low power consumption and wide operating temperature range, and are expected to achieve a breakthrough in frequency and power of the devices and overall performance improvement. Field emission cold cathodes are the core components of vacuum microelectronic devices, and their performance directly affects the overall performance of the device. The selection, preparation and field emission performance of cold cathode materials have a crucial influence on the performance and lifetime of cold electron source vacuum devices. Compared with other materials, carbon-based materials (such as carbon nanotubes, graphene, etc.) exhibit superior field emission performance.
Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences The Low-dimensional Materials and Chemical Energy Storage Research Group has been working on the construction and performance of carbon-based nanomaterial cold cathodes, and has successively cooled carbon substrates such as graphene and carbon nanotubes. Cathodes were studied and cold cathodes with excellent emission characteristics were obtained to meet the requirements of different vacuum electronic devices. Related results were published in SCIENCE CHINA Materials 60, 335 (2017), Nanotechnology 27, 445707 (2016), Applied Physics Letters 108, 193112 (2016), Applied Surface Science 357, 1 (2015), Nanoscale Research Letters 10, 483 (2015 ), Applied Physics Letters 105, 213111 (2014), Physical Chemistry Chemical Physics, 16, 1850 (2014), AIP Advances 2, 022101 (2012), Applied Physics Letters 99, 173104 (2011) and Applied Physics Letters 99, 163103 (2011 ) And other magazines.
Currently, the field emission cold cathodes are all driven by DC continuous or pulsed high voltage power supplies. Such power supply devices are not only expensive, bulky, bulky, but also have poor safety, which limits the further reduction in size, weight, and portability of cold cathode devices. Looking for a new type of cold cathode drive to meet the needs of different operating conditions is imminent.
Based on frictional electrification and electrostatic induction, frictional nanogenerators (TENG) utilize the charge transfer caused by the friction between materials to convert the mechanical energy in the environment into electrical energy for energy collection and conversion. TENG can output high voltage and certain power to meet the working requirements of low-voltage open cold cathodes. The researchers of Lanzhou Institute of Materials Research used a three-dimensional network carbon to prepare a cold cathode with good emission performance driven by a DC continuous power supply; at the same time, researchers tried to use a TENG with a high voltage output (maximum output voltage of 800 V) to drive a three-dimensional network carbon cold cathode .
Experiments show that the use of TENG high-voltage output can completely achieve the cold cathode electron emission, while the field emission electron bombardment screen can observe the uniform and continuous light spot, confirmed the feasibility of using TENG as a continuous power supply to drive the cold cathode. This work offers the possibility of further miniaturization, lightweighting, and self-driving of cold cathode vacuum electronics, and the results are published online in Nano Energy, 49, 308 (2018). The first authors of the paper are Chen Jiangtao, Yang Bingjun, and Lin Yidian (Nanyang Technological University, Singapore). The author of the paper is Mou Xingbin.
The series of research work was supported by the "100-person plan" of the Chinese Academy of Sciences, the National Natural Science Foundation of China (51002161), and the "1-3" planning project of the Lanzhou Institute of Chemicals.
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