Effect Type Of Conductive Ink To Stretchable Printed Circuit Under Thermal Performance

Rozali , Nurul Syafika (2018) Effect Type Of Conductive Ink To Stretchable Printed Circuit Under Thermal Performance. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Polymer-based electrically conductive inks become as essential elements in flexible and stretchable electronics.The electrically stretchable conductive inks have been applied in various fields such as in biomedical,which is to detect the hydration of athlete’s body.Stretchable conductive inks were also used in electronic devices and textile application due to the specialities that can withstand high stress conditions and tend towards high temperature.In order to develop stretchable conductive inks that have good electrical properties by considering the cost of production,further investigation must be done on the properties of the conductive ink.This study seeks to investigate the effects of thermal and mechanical test on sheet resistance of the conductive inks.This study also presents on how weight percentage of filler loading affected the resistivity.This study is focusing on the measurement of sheet resistance for two different types of conductive inks,which are carbon black and single walled carbon nanotubes by using four-point probe system and referred ASTM F390 as a guideline.Thermoplastic polyurethane was used as the substrate.For the thermal test, the samples were exposed to the four different level of temperature -32 °C (room temperature),40 °C, 60 °C and 100 °C.Hair dryer was used as tool to supply heat since it is easy to handle and can control the level of heat easily.Next,for the mechanical test,it is includes of strain test at 20 %,40 %,60 % and 80 % of elongation in room temperature condition.The strain test is conducted by using vernier callipers as a tool to provide strain.Scanning Electron Microscope (SEM) was used to analyzed the surface morphology and the determination wt.% of filler loading for both inks.As a result,it was found that sheet resistance of conductive ink were decreased as the temperature applied increase. However,for the strain test,sheet resistance increase with the increasing of strain applied.Eventually,the higher wt.% of filler loading contained in the conductive ink,the lower the sheet resistance value.

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