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Self-generated local heating induced nanojoining for room temperature pressureless flexible electronic packaging
Peng Peng1, Anming Hu2, Adrian P Gerlich3
11] 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.
Scientific Reports
|March 20, 2015
Summary
Researchers developed a room-temperature, pressureless joining method for copper wires using silver nanowire paste. This technique utilizes self-generated local heating for strong, conductive metallic bonds without external energy input.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Metallic bonding at interfaces is crucial for joining nanoscale structures.
- Current methods often require external heat or pressure, limiting applications.
Purpose of the Study:
- To investigate the feasibility of room-temperature, pressureless joining of copper wires using silver nanowire paste.
- To explore a novel self-heating mechanism for metallic bond formation.
Main Methods:
- Utilized a water-based silver nanowire paste for joining copper wires.
- Investigated a novel mechanism of self-generated local heating within the paste and substrate system.
- Experimentally detected and computationally confirmed the in-situ local heating effect.
Main Results:
- Achieved room-temperature, pressureless joining of copper wires with a tensile strength of 5.7 MPa.
- Formed joints with ultra-low resistivity (101.3 nOhm · m) due to organic compound removal and metallic bonding.
- Demonstrated successful application of the paste on various flexible substrates.
Conclusions:
- Self-generated local heating enables efficient metallic bonding at room temperature without external energy or pressure.
- This water-based silver nanowire paste is a viable material for flexible substrate bonding.
- Chemically generated local heating presents a promising approach for in-situ energy delivery at the micro/nanoscale.
