title: Self-generated local heating induced nanojoining for room temperature pressureless flexible electronic packaging.
abstract: Metallic bonding at an interface is determined by the application of heat and/or pressure. The means by which these are applied are the most critical for joining nanoscale structures. The present study considers the feasibility of room-temperature pressureless joining of copper wires using water-based silver nanowire paste. A novel mechanism of self-generated local heating within the silver nanowire paste and copper substrate system promotes the joining of silver-to-silver and silver-to-copper without any external energy input. The localized heat energy was delivered in-situ to the interfaces to promote atomic diffusion and metallic bond formation with the bulk component temperature stays near room-temperature. This local heating effect has been detected experimentally and confirmed by calculation. The joints formed at room-temperature without pressure achieve a tensile strength of 5.7 MPa and exhibit ultra-low resistivity in the range of 101.3 nOhm · m. The good conductivity of the joint is attributed to the removal of organic compounds in the paste and metallic bonding of silver-to-copper and silver-to-silver. The water-based silver nanowire paste filler material is successfully applied to various flexible substrates for room temperature bonding. The use of chemically generated local heating may become a potential method for energy in-situ delivery at micro/nanoscale.
authors: 1] Centre for Advanced Materials Joining, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada [2] Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
authors: Peng
authors: P
authors: Peng
authors: 1] Centre for Advanced Materials Joining, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada [2] Mechanical, Aerospace and Biomedical Engineering Department, University of Tennessee, 1512 Middle Drive, Knoxville, TN 37996-2210, US.
authors: Anming
authors: A
authors: Hu
authors: Centre for Advanced Materials Joining, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
authors: Adrian P
authors: AP
authors: Gerlich
authors: School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China.
authors: Yangai
authors: Y
authors: Liu
authors: 1] Centre for Advanced Materials Joining, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada [2] Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
authors: Y Norman
authors: YN
authors: Zhou