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A highly sensitive printed humidity sensor based on a functionalized MWCNT/HEC composite for flexible electronics

Vikram S Turkani1, Dinesh Maddipatla1, Binu B Narakathu1

  • 1Department of Electrical and Computer Engineering, Western Michigan University 4601 Campus Drive Kalamazoo Michigan-49008 USA vikramshreeshail.turkani@wmich.edu +1 269 276 3148.

Nanoscale Advances
|September 22, 2022
PubMed
Summary
This summary is machine-generated.

A new functionalized multi-walled carbon nanotube (FMWCNT)/hydroxyethyl cellulose (HEC) composite humidity sensor was developed using additive manufacturing. This printed sensor shows a linear resistive response to humidity, demonstrating its potential for effective humidity monitoring.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Developing advanced materials for environmental monitoring is crucial.
  • Functionalized carbon nanotubes offer unique properties for sensor applications.
  • Hydroxyethyl cellulose provides a flexible matrix for composite materials.

Purpose of the Study:

  • To develop a novel functionalized multi-walled carbon nanotube (FMWCNT)/hydroxyethyl cellulose (HEC) composite-based humidity sensor.
  • To utilize additive print manufacturing for sensor fabrication.
  • To evaluate the performance of the developed humidity sensor.

Main Methods:

  • Covalent functionalization of multi-walled carbon nanotubes (MWCNTs) to enhance hydrophilicity.
  • Formulation of a FMWCNT/HEC composite ink via solution blending.
  • Fabrication of a multi-layered sensor on a polyethylene terephthalate (PET) substrate using screen and gravure printing.
  • Characterization of FMWCNTs using TEM, Raman, and FTIR spectroscopy.

Main Results:

  • The FMWCNT/HEC composite sensor exhibited a linear increase in resistance with increasing relative humidity (RH) from 20% to 80%.
  • The sensor demonstrated a significant resistance change of approximately 290% at 80% RH compared to 20% RH.
  • Achieved sensitivity of 0.048/%RH and a response time of approximately 20 seconds.

Conclusions:

  • Additive print manufacturing is a feasible method for creating highly sensitive humidity sensors.
  • The FMWCNT/HEC composite material shows promise for humidity monitoring applications.
  • The developed sensor offers good performance characteristics for practical use.