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Sensitive Load Sensor Based on Piezoresistive Properties of Multi-Walled Carbon Nanotube



Choolaei M2, 3 ; Nazarzadeh M1 ; Yadegari A1 ; Zali H1 ; Yazdian F4 ; Omidi M1
Authors
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Authors Affiliations
  1. 1. Medical Nano-Technology & Tissue Engineering Research Center, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical sciences, Tehran, Iran
  2. 2. Department of Tissue Engineering and Regenerative Medicine, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical sciences, Tehran, Iran
  3. 3. Research Institute of Petroleum Industry (RIPI), Azadi sport complex West Blvd, Tehran, Iran
  4. 4. Faculty of New Science and Technology, University of Tehran, Tehran, Iran

Source: IIOAB Journal Published:2016

Abstract

The fabrication of a micro-electro-mechanical systems (MEMS) piezoresistive load sensor is reported. The sensor has the shape of a cantilever beam on a paper substrate. Printable multi-walled carbon nanotube (MWCNT) ink was fabricated to be used as a sensing component, because of its excellent piezoresistive and electromechanical properties. The results show that using MWCNT ink with proper sonication duration can result in a considerable force range and gauge factor for the fabricated sensor, which are two important designing factors. The results illustrated a linear resistance change with the applied forces. The force range, force resolution, and sensitivity were found to be 25 mN, 60 µN, and 1.6 mV mN-1, respectively. Furthermore, the effects of sonication time, number of printing, and temperature on the ink resistance are experimentally studied. Finally, in order to decrease the noise levels monolithic integration of a signal-processing circuit was used. This sensor is inexpensive, simple to fabricate, lightweighted, and disposable. © 2016, Institute of Integrative Omics and Applied Biotechnology. All rights reserved.