Abstract
In this work, the pressure-sensitive properties of pure multi-walled carbon nanotubes and multi-walled carbon nanotubes/bismuth sulfide composite are investigated and compared. Composite was prepared by 50 wt% of each ingredient. Sandwich-type pressure-sensitive pellets (Ag/CNT/Ag and Ag/CNT-Bi2S3/Ag) of 2 mm in thickness and 15 mm in diameter were fabricated at a pressure of 6894.8 kNm−2by Mortar and Pestle/Hydraulic Press technique. Both sides of the prepared samples were painted with silver paste to provide low resistance electrical contacts. Both the samples exhibited decrease in direct current resistance with the increase in the applied pressure (0–16.9 kNm−2). However, decrease in the resistance of multi-walled carbon nanotubes/bismuth sulfide composite was 1.2 times and sensitivity was 1.07 times higher than the pure carbon nanotubes. Experimental results were compared with simulated results that showed excellent agreement with each other.
Highlights
In recent years, nanomaterials and its composites have drawn a great deal of interest in a wide range of applications, due to their enhanced chemical, electrical, physical, mechanical, optical, and biological properties.[1,2] Nanomaterials can be engineered through controlled and size selective synthesis techniques to tune its properties for a specific application.[3]
For the first time, we reported the fabrication and characterization of a novel sandwich-type, pressure-sensitive sensor based on Carbon nanotubes (CNTs)/Bi2S3 composite and provided a detail assessment of pressure–resistance relationship and its sensitivity
Such behavior of strong bending shows the extreme flexibility of MWCNTs, which makes these materials suitable for sensing technology
Summary
Nanomaterials and its composites have drawn a great deal of interest in a wide range of applications, due to their enhanced chemical, electrical, physical, mechanical, optical, and biological properties.[1,2] Nanomaterials can be engineered through controlled and size selective synthesis techniques to tune its properties for a specific application.[3]. May be due to (1) the reduction in the inter-electrode distance “d” of the sample by squeezing effect that decreases the distance between CNTs and Bi2S3 particles and (2) the traps between the highest occupied molecular orbital (HOMO) and lower unoccupied molecular orbital (LUMO) band gap in disordered material that may cause a potential barrier (trap states) to trap the charge carriers.
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