Fabrication of Novel Ag Flake Composite Films Using a CMC/PEI Cross-Linking Process

• Published in: Electronic materials letters Vol. 16; no. 4; pp. 332 - 339
• Main Authors: Lee, Choong-Jae, Hwang, Byeong-Uk, Jeong, Haksan, Min, Kyung Deuk, Jung, Seung-Boo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.07.2020; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed Matter Physics; Crosslinking; Differential scanning calorimetry; Electrical resistivity; Flake composites; Flakes; Fourier transforms; Functional groups; Heat conductivity; Heat transfer; Infrared spectroscopy; Magnetics and Photonics; Materials Science; Mechanical properties; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Original Article - Electronics; Polyethyleneimine; Silver; Thermal conductivity; Thermal diffusivity; Thermal resistance; Thermodynamic properties; Thermogravimetric analysis; 전자/정보통신공학; Composite; Cross-linking; Ag flakes; Thermal behavior
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-020-00218-z

The multifunctional properties of cross-liked carboxymethlycellulose (CMC) and polyethyleneimine (PEI) films with varied CMC:PEI ratios and Ag flake sizes were studied. Both the CMC and PEI were cross-linked through a sonication process to achieve dispersive equilibrium. Fourier-transform infrared spectroscopy (FT-IR) was used to identify the functional groups in the sample material, with thermogravimetric analysis and differential scanning calorimetry used to investigate the overall thermal behavior of the CMC–PEI cross-linked films. Thermal diffusivity and thermal conductivity were also analyzed using laser flash analysis. To analyze the effects of Ag flakes as a filler material, the distribution of the Ag flakes within the film was determined using scanning electron microscopy. The thermal conductivity and resistance of the CMC films increased when cross-linked with 20% PEI. The electrical and thermal properties of the films also improved with the addition of Ag flakes. Graphic Abstract The multifunctional properties of cross-liked carboxymethlycellulose and polyethyleneimine films with varied CMC:PEI ratios and Ag flake sizes were studied. The thermal, electrical and mechanical properties of solder joints were investigated by using various kinds of tests.