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Femtosecond laser irradiation induced heterojunctions between carbon nanofibers and silver nanowires for a flexible strain sensor

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Journal of Materials Science & Technology 2021年第25期84卷 139-146页

作者： Jiayun Feng Yanhong Tian Sumei Wang Ming Xiao Zhuang Hui Chunjin Hang Walter W.Duley Y.Norman Zhou State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Centre for Advanced Materials Joining University of WaterlooWaterlooOntarioN2L 3G1Canada Laser Micro/Nano-Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing100083China Department of Physics and Astronomy University of WaterlooWaterlooOntarioN2L 3G1Canada

We report the direct joining of carbon nanofibers(CNFs)to silver nanowire(Ag NWs)by controlled irradiation with femtosecond(fs)laser *** separate types of nano-junction dependent on joint geometry,laser fluence and irradiation time are identified in irradiated *** one type of junction,the tip of an Ag NW is melted and flows to form a bond with an adjacent *** second type of junction occurs without significant heating of the Ag NW and involves the softening and flow of carbon in the CNF in response to the transfer of plasmonic energy from the Ag NW into the *** in a T-type joint configuration can be of either kind depending on the relative orientation of the incident optical field and the long axis of the Ag *** simulations were used to explore this effect for different joint geometries and laser *** electrical properties of a heterojunction involving a single Ag NW-CNF structure have been measured,and it is found that the junction resistance can be reduced by six orders of magnitude after laser ***,we have investigated the properties of a strain sensor based on an Ag NW-CNF hybrid nanowire network and find that this device can exhibit high *** sensitivity occurs as nano-junctions induced by fs laser irradiation greatly reduces the initial *** laser-based technique for direct nanojoining of CNF and Ag NWs may enable the design of robust nanowire structures for application in a variety of new devices.

关键词： nanojoining Carbon nanofiber Silver nanowire Femtosecond laser Strain sensor

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Nanoscale Wire Bonding of Individual Ag Nanowires on Au Substrate at Room Temperature

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Nano-Micro Letters 2017年第3期9卷 27-32页

作者： Peng Peng Wei Guo Ying Zhu Lei Liu Guisheng Zou Y.Norman Zhou School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People’s Republic of China International Research Institute for Multidisciplinary Science Beihang UniversityBeijing 100191People’s Republic of China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Centre for Advanced Materials Joining University of WaterlooWaterlooON N2L 3G1Canada

The controllable wire bonding of individual Ag nanowires onto a Au electrode was achieved at room temperature. The plastic deformation induced by pressure using nanoindentation could break the protective organic shell on the surface of the Ag nanowires and cause atomic contact to promote the diffusion and nanojoining at the Ag and Au interface. Severe slip bands were observed in the Ag nanowires after the deformation. A metallic bond was formed at the interface, with the Ag diffusing into the Au more than the Au diffused into the Ag. This nanoscale wire bonding might present opportunities for nanoscale packaging and nanodevice design.

关键词： nanojoining Bonding Diffusion Interface Nanoindentation

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Nano Brazing of Pt-Ag Nanoparticles under Femtosecond Laser Irradiation

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Nano-Micro Letters 2013年第2期5卷 88-92页

作者： L.Liu H.Huang A.Hu G.Zou L.Quintino Y.Zhou Department of Mechanical Engineering Tsinghua University Department of Mechanical & Mechatronics Engineering University of Waterloo Technical University of Lisbon

Nano brazing of Pt-Ag nanoparticles with nano Ag filler metal is reported in this letter, which presents an effective way to join nanoobjects by femtosecond laser irradiation. The nano brazed interface between Pt-Ag and Ag showed good lattice matching along(111)_(Ag) //(111)_(Ag-Pt). Lattice mismatch can hardly be observed at the interface between the filler metal and Pt-Ag nanoparticle, which is important for the joint strength and normally does not occur during joining. The very low mismatch also suggested that melting and solidification occurred during nano brazing by femtosecond laser. The role of Brownian motion on the nano joining process is also discussed in this paper.

关键词： Femtosecond laser nanojoining Nanoparticles

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Microjoining for Medical, Microelectronic and MEMS Applications

Microjoining for Medical, Microelectronic and MEMS Applicati...

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第十一次全国焊接会议

作者：周运鸿 Michael Mayer Microjoining Laboratory Centre for Advanced Materials JoiningUniv.of WaterlooWaterlooOntarioCanada Microjoining Laboratory Centre for Advanced Materials JoiningUniv.of WaterlooWaterlooOntarioCanada

＜正＞ This paper will review recent advances and current challenges in microjoining technology in selected areas, such as bonding mechanism studies, process development and optimization, process sensing and monitoring, dissimilar material combinations, part positioning and fixturing, machine accuracy, etc. A number of examples will be provided of both practical applications and R＆D activities. For example, case studies will be outlined of microjoining applications in microelectronic packaging, implantable cardiac pacemaker interconnection and hermetic sealing, and radioactive seed implant encapsulation for prostate cancer treatment. Examples of current R＆D will include in-situ monitoring in wire bonding using integrated microsensors, bonding mechanism studies in resistance cross-wire bonding, developments in fluxless soldering by plasma, and laser-ultrasonic bonding. Finally, discussions will be offered about future developments, especially in the areas of MEMS packaging, and nanojoining - the next frontier for materials joining technology.

关键词： Microjoining Medical devices Microelectronic components MEMS packages nanojoining

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