A commercial plasma immersion ion implanter has been designed and constructed to enhance the surface properties of parts and components used in aerospace applications. The implanter consists of a vacuum chamber, pumpi...A commercial plasma immersion ion implanter has been designed and constructed to enhance the surface properties of parts and components used in aerospace applications. The implanter consists of a vacuum chamber, pumping and gas inlet system, custom sample chuck, four sets of hotfilaments, threefiltered vacuum arc plasma sources, special high voltage modulator, as well as monitoring and control systems. Special attention has been paid to improve the uniformity of plasma in the chamber. The power modulator operates in both the pulse bunching and single pulse modes. The maximum pulse voltage output is 80kV, maximum pulse current is 60A, and repetition frequency is 50～500Hz. The target chuck has been specially designed for uniform implantation into multiple aerospace components with irregular geometries as well as effective sample cooling. An in situ temperature monitoring device comprising dual thermocouples has been developed. The instrument was installed in an aerospace company and has been operating reliably for a year. In addition to reporting some of the hardware innovations, data on the improvement of the lifetime of an aircraft hydraulic pump disk using a dual nitrogen treatment process m-2; 30～45kV are presented. This treatment protocol has been adopted as a standard production procedure in the factory.展开更多
The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thicknes...The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thickness of metal films to enhance flexibility which faces limitations due to the skin effect.Herein,a hybrid graphene-Au nanomembrane is produced by one-step delamination processes to address the limitations of traditional metal films,including flexibility and RF functionality.The graphene-Au nanomembrane features a bond-free van der Waals interface,allowing the Au layer move freely with graphene.This structure mitigates the formation of cracks,enhancing the stretchability to over 14%strain and fatigue resistance.Moreover,this composite overcomes the limitations associated with skin depth,consequently enabling an ultra-thin graphene-Au antenna operating at 8.5 GHz for 5 G communications.We also demonstrate wireless image transmission and electromagnetic stealth.The results underscore the significant impact of the innovative design and materials on flexible wireless technology.展开更多
文摘A commercial plasma immersion ion implanter has been designed and constructed to enhance the surface properties of parts and components used in aerospace applications. The implanter consists of a vacuum chamber, pumping and gas inlet system, custom sample chuck, four sets of hotfilaments, threefiltered vacuum arc plasma sources, special high voltage modulator, as well as monitoring and control systems. Special attention has been paid to improve the uniformity of plasma in the chamber. The power modulator operates in both the pulse bunching and single pulse modes. The maximum pulse voltage output is 80kV, maximum pulse current is 60A, and repetition frequency is 50～500Hz. The target chuck has been specially designed for uniform implantation into multiple aerospace components with irregular geometries as well as effective sample cooling. An in situ temperature monitoring device comprising dual thermocouples has been developed. The instrument was installed in an aerospace company and has been operating reliably for a year. In addition to reporting some of the hardware innovations, data on the improvement of the lifetime of an aircraft hydraulic pump disk using a dual nitrogen treatment process m-2; 30～45kV are presented. This treatment protocol has been adopted as a standard production procedure in the factory.
基金supported by the National Key R&D Program of China(Grant Nos.2022YFB3204800,2022YFB4400100)National Natural Science Foundation of China(Grant Nos.51925208,62122082,52350209)+3 种基金Science and Technology Commission of Shanghai Municipality(Grant No.21JC1406100)CAS Project for Young Scientists in Basic Research(Grant No.YSBR-081)Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB0670000)City University of Hong Kong Donation Research Grants(Grant nos.DON-RMG 9229021 and 9220061).
文摘The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thickness of metal films to enhance flexibility which faces limitations due to the skin effect.Herein,a hybrid graphene-Au nanomembrane is produced by one-step delamination processes to address the limitations of traditional metal films,including flexibility and RF functionality.The graphene-Au nanomembrane features a bond-free van der Waals interface,allowing the Au layer move freely with graphene.This structure mitigates the formation of cracks,enhancing the stretchability to over 14%strain and fatigue resistance.Moreover,this composite overcomes the limitations associated with skin depth,consequently enabling an ultra-thin graphene-Au antenna operating at 8.5 GHz for 5 G communications.We also demonstrate wireless image transmission and electromagnetic stealth.The results underscore the significant impact of the innovative design and materials on flexible wireless technology.
