Enhancing effect of KMnO4 oxidation of carbon nanotubes network embedded in elastic polyurethane on overall electro-mechanical properties of composite

Abstract

The effect of functionalization of multi-walled carbon nanotubes using KMnO 4 oxidation and oxygen plasma treatment on the electrical resistance of nanotube network/polyurethane composite subjected to elongation has been studied. The layered composite is prepared by taking a non-woven polyurethane filtering membrane which is made by electrospinning, enmeshing it with carbon nanotubes and melding them into one. The testing has shown tenfold composite resistance increase for the composite prepared from KMnO 4 oxidized nanotubes in comparison to the network prepared from pristine nanotubes. The evaluated sensitivity of the treated 2 composite in terms of the gauge factor increases linearly with strain from values around 5 at the start of deformation to nearly 45 at the strain 12 %. This is a substantial increase, which put the composite prepared from KMnO 4 oxidized nanotubes among ranges the materials and strain gauges with the highest sensitivity of electrical resistance measurement.

A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology

“…In addition, soft and flexible materials such as polydimethylsiloxane (PDMS) and Eco-flex have been widely studied in strain sensors based on nanomaterials (e.g., nanoparticles, nanowires, nanotubes) [5,6,7,8]. For instance, stretchable strain sensors are printed using silver nanowires [9].…”

Multifunctional flexible and stretchable polyurethane/carbon nanotube strain sensor for human breath monitoring

“…In fact, the cross section of final specimen demonstrated three‐layer structure. There was 1‐mm‐thick TPU base followed by MWCNT/TPU nanocomposite layer created by melting of TPU filter with infiltrated nanotubes (thickness 3–5 μm) and finally, layer of entangled MWCNT network with thickness of about 15 μm . When TPU dog‐bone shape specimen is elongated, this deformation is transferred directly to piezoresistive layers, which lead to its electrical resistance increase.…”

“…Then the change in resistance is a measure of applied deformation. This kind of sensors is from area of so called crack sensors when during extension microcrack in structure appears, which oppositely recover in off load state . An example of microcrack structure at ~20% of longitudinal strain is demonstrated at Figure E (arrows indicate extension direction).…”

“…Finally, a gesture‐based human‐machine interface was developer by the resistance change of glove‐mounted sensors while bending a finger . Another types of crack‐based sensor were demonstrated for example in previous studies . In another case, polymer/graphite sensor was capable to detect very soft human movements such as pulses, respiration rates, and throat vibration .…”

Selective Plasma Etching of Polyphenolic Composite in O2/Ar Plasma for Improvement of Material Tracking Properties

“…[1][2][3][4][5] Surface modification of polymer materials by functionalization or etching was used for the surface nanostructuring, improved adhesion, water repellence, or grafting of suitable surface coatings. [6,7] Among various surface properties, the degradation of polymer materials was studied extensively under various chemical and physical environments due to interest for technology transfer into the industrial scale processing. To monitor the surface processing and kinetics, infrared microscopy was found to be one of the efficient tools for monitoring the polymer degradation mechanisms in various physical and chemical environments.…”