Quantum mechanics

Mean curvature

Engineering

Curvature

Materials science

Layer (electronics)

Computer security

RADIUS

Relative humidity

Resistive touchscreen

Screen printing

Computer science

Humidity

Surface roughness

Physical chemistry

Thermodynamics

Physics

Hysteresis

Nanotechnology

Carbon nanotube

Radius of curvature

Mathematics

Geometry

Mean curvature flow

Conductivity

Composite material

Chemistry

Electrode

Optoelectronics

Electrical engineering

Electrical conductor

IEEE Sensors Journal

A resistive flexible humidity sensor based on multi-walled carbon nanotubes (MWCNTs) was designed and fabricated. Screen and gravure printing processes were used for monolithically fabricating the humidity sensor containing interdigitated electrodes (IDE), a sensing layer and a meandering conductive heater. An average thickness and surface roughness of 0.99 μm and 0.23 μm, respectively, was registered for the printed MWCNTs sensing layer. The capability of the printed sensor, with heater, was investigated by subjecting it to relative humidity (RH) ranging from 10% to 90%. The response demonstrated an overall resistance change of 55% when the sensor was subjected to 90% RH, when compared to 10% RH. A maximum hysteresis of 5.1%, at 70% RH, was calculated for the resistive response of the sensor. The printed sensors can be bend with radius of curvature of 1.5 inch with literally no effect.

Printed Carbon Nanotubes-Based Flexible Resistive Humidity Sensor