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Carbon Nanotube and Polyacrylonitrile Nanofiber Devices for Sensing Applications
Date Issued
2022
Author(s)
Kumar, N
Kumar, P
Navani, NK
Manhas, SK
Abstract
In this paper, a novel technique is presented to fabricate aligned polymer-wrapped semiconducting carbon nanotube (CNT)based devices to overcome the issues that arise in randomly oriented CNT network devices. It is challenging to make the CNT-based devices with straight polymer-wrapped CNTs. Straight CNTs have better conductivity than the bended ones. Therefore, we have fabricated simple electrodes of a square pad with the conventional lithography process. Subsequently, dispersed single-walled CNTs (SWNT)-polyacrylonitrile is used to fabricate aligned nanofiber by an electrospinning system on the fabricated electrodes. The average diameter of the fabricated nanofiberr is found to be 100 nm. The current-voltage (I-V) characteristics are investigated for the fabricated devices. The I-V characteristics are similar to those of a back-toback Schottky diode. The Schottky barrier height and ideality factor of the nanofiber devices are found to be 431 meV and 4.1, respectively. Therefore, the multiple current transport mechanisms (thermionic emission, tunneling, generation-recombination, and leakage) contribute to the current through the nanofiber device. Applications of the devices can include gas sensors, biosensors, and other CNT-based device electronics applications. [GRAPHICS] .
Volume
51