The Study of Silver-Electroless-Plated particles for Electrically Conductive Adhesives and the Effect of Alkyl Thiol Compounds on their conductivities
Date Issued
2006
Date
2006
Author(s)
Kuo, Chih-Hao
DOI
zh-TW
Abstract
Abstract
The thesis was divided into two parts. The first part of study was preparing conductive particles. The second part of study was preparing electrically conductive adhesives(ECAs). In the experiments, we observed particle size and surface morphology by particle size instrument and SEM. We also analyzed if silver was electroless plated on particles surface and plated weight by XRD and ICP. We also analyzed if alkyl thiol compound was deposited on particles surface by ESCA.
In the study of preparing conductive particles, we take the 0.804 μm flake copper to immerse silver, and we also take the 0.982 μm flake graphite(GS-75) and the 4.292 μm flake graphite(GP-44) to plate silver electroless. We can find there was Ag and CuO on Cu/Ag particle surface by XRD, and there was Ag and Ag2O on GS-75/Ag and GP-44/Ag particles surface by XRD. We also find the best plated time of copper was 30 seconds by ICP, and the reaction stopped after 30 seconds. The best plated time of graphite was 3 minutes by ICP. The reaction rate became slow after 3 minutes because the catalytic layer (Pd layer) had been covered. In the same time, small particle graphite (GS-75) electroless plated more silver weight than big particle graphite (GP-44),because the specific surface area of small particle graphite (GS-75) was bigger. We can find alkyl thiol compound deposited on Cu/Ag、GS-75/Ag、GP-44/Ag after immersing 10 minutes alkyl thiol compound by ESCA.
In the study of preparing electrically conductive adhesives, we can find resistivity ρ must decline after immersing silver or electroless plating silver. We also find resistivity ρ must decline after adding alkyl thiol compound, so resistivity ρ of ECAs of three particles Cu 、GS-75、 GP-44 decline about one order after plating silver and adding alkyl thiol compound.
The best ratio between conductive particles and alkyl thiol compound was 1：0.4, and resistivity ρ of ECAs was lower for the shorter carbon chain of alkyl thiol compound. In this thesis, the best resistivity ρ of ECAs was 0.014 ohm-cm, and it was the ECAs of GS-75/Ag dispersed with 0.4g C4H9SH.
Subjects
無電鍍銀
硫醇
導電膠
Silver-Electroless-Plating
Alkyl Thiol Compounds
ECAs
Type
thesis
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