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Microstructure of metallic copper nanoparticles/metallic disc interface in metal–metal bonding using them
Author(s) -
Kobayashi Yoshio,
Shirochi Tsukasa,
Maeda Takafumi,
Yasuda Yusuke,
Morita Toshiaki
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5299
Subject(s) - metal , copper , materials science , nanoparticle , bromide , microstructure , tetragonal crystal system , chemical engineering , metallurgy , crystal structure , inorganic chemistry , chemistry , crystallography , nanotechnology , engineering
Abstract This paper describes a metal–metal bonding technique using metallic Cu nanoparticles prepared in aqueous solution. A colloid solution of metallic Cu particles with a size of 54 ± 15 nm was prepared by reducing Cu 2+ (0.01 M (CH 3 COO) 2 Cu) with hydrazine (0.6 M) in the presence of stabilizers (5 × 10 −4 M citric acid and 5 × 10 −3 M cetyltrimethylammonium bromide) in water at room temperature in air. Discs made of metallic materials (Cu, Ni/Cu, or Ag/Ni/Cu) were successfully bonded under annealing at 400 °C and pressurizing at 1.2 MPa for 5 min in H 2 gas with help of the metallic Cu particle powder. Shear strength required for separating the bonded discs was 27.9 ± 3.9 for Cu discs, 28.1 ± 4.1 for Ni/Cu discs, and 13.8 ± 2.6 MPa for Ag/Ni/Cu discs. Epitaxial crystal growth promotes on the discs with a good matching for the lattice constants between metallic nanoparticles and metallic disc surfaces, which leads to strong bonding. Copyright © 2013 John Wiley & Sons, Ltd.