TENG drive 3D network cold cathode schematic
The field emission vacuum electron device has a simple structure, fast response, no radiation and anti-jamming, low power consumption and wide operating temperature range, and is expected to achieve a breakthrough in frequency and power of the device and enhance the overall performance. As the core component of the vacuum microelectronic device, the cold cathode has a direct impact on the overall performance of the device. The choice of cold cathode material, preparation and field emission performance are critical to the performance and lifetime of the vacuum electron source vacuum device. Influence. 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. It has successively carbon-based colds 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 Letters105, 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 others.
Currently, field emission cold cathodes are all driven by DC continuous or pulsed high-voltage power supplies. Such power supply equipment is not only expensive, bulky, bulky, and poor in safety, limiting the further reduction in size, weight, and portability of cold cathode devices. A new type of cold-cathode driving method, which satisfies the application requirements under different working conditions, is imminent.
Based on frictional electrification and electrostatic induction principle, frictional nanogenerator (TENG) utilizes the charge transfer caused by the friction between materials and can convert the mechanical energy in the environment into electric energy to realize energy collection and conversion. TENG can output high voltage and certain power. Satisfy the working requirements of low-voltage open cold cathodes. Researchers at Lanzhou Institute of Technology have adopted a three-dimensional network carbon to prepare cold cathodes with good emission performance driven by DC continuous power supplies; at the same time, researchers tried to use TENG with high voltage output (maximum output voltage 800 V) to drive a three-dimensional network carbon cold cathode.
Experiments show that the high-voltage output of TENG can fully realize the electron emission of the cold cathode, while the uniform and sustained spot can be observed by the field emission electron bombardment screen, confirming the feasibility of using TENG as a continuous electric energy supply to drive the cold cathode. This work offers the possibility of further miniaturization, lightweighting and self-driving of cold-cathode vacuum electronics. The results were published online in Nano Energy, 49, 308 (2018). The paper's co-first authors were Chen Jiangtao, Yang Bingjun and Lin Yidian ( Nanyang Technological University, Singapore. Corresponding author 阎兴斌.
This series of research work was supported by the Chinese Academy of Sciences' 100-person plan, the National Natural Science Foundation of China (51002161) and the Lanzhou Institute of Materials' "1-3" planning project.
