Evaluation of (CNT@CIP)-Embedded Magneto-Resistive Sensor Based on Carbon Nanotube and Carbonyl Iron Powder Polymer Composites.

Daeik Jang,Jae-Eun Park,Young-Keun Kim

doi:10.3390/polym14030542

Daeik Jang, Jae-Eun Park + Show 1 more

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https://doi.org/10.3390/polym14030542

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Abstract

The conductive polymeric composites incorporating carbon nanotube (CNT) and carbonyl iron powder (CIP) have attracted much attention for various sensor applications. In this paper, a comprehensive study of the magneto-sensing property of a CNT-CIP embedded polymer composite is conducted to implement the composite as magneto-sensors. Thus, this study experimentally investigated the magneto-sensing performances of CNT-doped polymeric composites with the addition of CIP in terms of electrical conductivity, sensitivity, repeatability, and response time. First, the CNT-CIP clusters were manufactured and their interactions were analyzed with the zeta potential measurement and SEM observation. Then, the CNT-CIP clusters were embedded into the polymeric composites for the magneto-sensing evaluations. Experiments showed that the CNT contents in the range of percolation threshold (i.e., 0.5% and 0.75%) are optimal values for sensor applications. The addition of CNT 0.5% and 0.75% resulted in a high sensitivity of 7% and a faster response time within 400 ms. Experiment evaluation confirmed a high potential of implementing CNT-CIP composite as magneto-sensors.

Highlights

Expeditious advancements of conductive polymeric composites (CPCs) have been gaining attention due to their high applicability, such as multi-functional sensors [1,2,3], electrical-heating composites [4,5,6], electromagnetic interference shielding composites [7,8,9], and other electronic devices [10,11]
The carbonyl iron powder (CIP)-based clusters coated with carbon nanotube (CNT) were developed
(CIP@CNT) clusters were fabricated, and their formation was investigated with the zeta potential measurement and SEM images

Summary

Introduction

Expeditious advancements of conductive polymeric composites (CPCs) have been gaining attention due to their high applicability, such as multi-functional sensors [1,2,3], electrical-heating composites [4,5,6], electromagnetic interference shielding composites [7,8,9], and other electronic devices [10,11]. Various kinds of conductive fillers including carbonbased fillers such as graphene, and carbon nanotubes and magnetic powder have been used to fabricate the CPCs due to their high electrical conductivity [11,12,13]. Carbon nanotube (CNTs) have been popular conductive fillers due to their remarkable electrical and mechanical properties and high compatibility with polymer matrix. Many researchers have attempted to use two types of conductive fillers to improve their mechanical, electrical, and sensing properties [14]. The CIP fillers in a polymeric composite respond to the magnetic field and can improve both the electrical conductivity and sensing capability of CNT-doped polymeric composites [15,16]. The investigations on electrostatic interaction that form the CIP-CNT clusters and the study of CNT effects on the magneto-sensing performances have not been reported to date, to the best of the authors’

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