The Effect Of Carbon Nanotube Aspect Ratio On The Functional Properties Of Electrically Conductive Adhesives

Abdul Raheem, Abdul Mueezz (2018) The Effect Of Carbon Nanotube Aspect Ratio On The Functional Properties Of Electrically Conductive Adhesives. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) The Effect Of Carbon Nanotube Aspect Ratio On The Functional Properties Of Electrically Conductive Adhesives.pdf - Submitted Version Download (208kB)

Abstract

Eliminating lead containing solder in electrical industries has driven the need to develop lead-free conducting material termed Electrically Conductive Adhesive (ECA), since the former interconnect material is high in toxic. Thus, ECA is seen as a substitute material with the advantage of being more environmental friendly interconnect material. ECA is made up of polymer as the binder and filler as the conductive material. Metal fillers such as silver, copper and gold are the most commonly used filler. More recently, non-metallic carbon-based material filler such as carbon nanotubes, carbon black and graphene are extensively studied and developed to be used as ECA conductive filler. In addition, ECA with multiwall carbon nanotubes (MWCNT) is developed to improve the strength and electrical conductivity. Current ECA used in industries has low electrical conductivity, poor impact strength and conductivity fatigue since the filler used are metal filler. This project investigates the effect of carbon nanotubes aspect ratio on the functional properties of electrically conductive adhesive. Generally, with higher aspect ratio of MWCNT filler in ECA, the electrical conductivity is better while as the filler loading increase, the shear strength decrease. Electrical and mechanical samples of ECA with different aspect ratio of the MWCNT filler were prepared and tested with reference to ASTM F390-11 and ASTM D1002 respectively. The ECA were prepared by using solution mixing process before curing in an oven at 100°C for 30 minutes. Here, the two aspect ratio of the MWCNT is 1750 while the second MWCNT aspect ratio is 112.5, with the range of MWCNT filler loading is used in this research, which is 5 wt.%, 6 wt.% and 7 wt.%. The specimens were subjected to electrical test using a four-point probe test unit and mechanical testing by using universal testing machine. By formulating ECA using high aspect ratio MWCNT, lower filler loading is needed to reach the percolation threshold which shows better conductivity compared to low aspect ratio MWCNT. As the filler loading increase, the result suggests lower shear strength of the MWCNT-filled ECA. MWCNT aspect ratio has significant effect on the electrical and mechanical properties of ECA which is caused by the agglomeration and dispersion of the MWCNT in the ECA.

Actions (login required)

View Item