Fabrication of polyvinyl alcohol/multi‐walled carbon nanotubes composite electrospun nanofibres and their application as microwave absorbing material

Abstract

Polyvinyl alcohol (PVA)/sodium dodecyl sulphate (SDS)/multi-walled carbon nanotubes (MWCNTs) composite nanofibres with various MWCNT contents (up to 10 wt%) were fabricated by electrospinning process and their microwave absorption properties were evaluated by a vector network analyser in the frequency range of 8-12 GHz (X-band) at room temperature. Scanning electron microscopy analysis of the nanofibre samples revealed that the deformation of the nanofibres increases with increasing MWCNT concentration. Very smooth surfaces of the composite electrospun nanofibres even for nanofibres with concentration of 10 wt% MWCNT have been successfully prepared because of the high stability dispersion of MWCNTs. It was observed that the absorption microwave properties improved by increasing the loading levels of MWCNTs. Finally, the PVA/SDS/MWCNT composite nanofibres sample with 10 wt% content of MWCNT has shown a reflection loss of 15 dB at a frequency of 8 GHz.

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

“…The lower viscoelastic force versus the higher electrostatic force can lead to decrease in the average diameter of nanofibers. 26,30 On the other hand, this reduction in diameter results from the enhanced conductivity of the polymer solution with increasing in PANI content. Large electric current produced during electrospinning causes large charge accumulation in the solution jet and therefore strong electrostatic repulsion could be produced.…”

“…Recently, though nanocomposites have extensively been studied as EMI shielding/absorbing materials but only few brief reports are available on the EMI shielding properties and specially microwave absorption characteristics for nanofiber structure. 4,26 In this study, PVA/PANI electrospun nanofibers with different proportion of polyaniline in the blend were prepared and then, PVA/PANI/MWNT composites in electrospun nanofibers and nanocomposite film forms were fabricated and finally their microwave absorption behaviors were compared at X-band microwave frequencies.…”

Evaluation of effective electrospinning parameters controlling polyvinylpyrrolidone nanofibers surface morphology via response surface methodology

“…The electrospun nanofibers have interesting properties such as the large surface area, flexibility, high porosity, small pore sizes, and superior mechanical properties, which are excellent candidates for applications in filtration, tissue engineering, sound absorption, shielding, drug delivery, sensors, protective clothing and bio-medicine [6][7][8]. The surface morphology and the diameter of electrospun nanofibers depend on several variables.…”

Fabrication and properties of Cfiber/Si3N4 composite by vacuum hot-pressing sintering

“…Recently, the electromagnetic absorbing materials that are widely used in commercial and military applications [1][2][3] have attracted increasing attentions because of the serious problems of EM pollution promoted by the rapid development of electronic and telecommunication systems [4][5][6]. Silicon nitride ceramics are well known as low-density materials with high-temperature strength and toughness and have been considered as one of the promising structure materials because of their excellent physical properties and thermal properties at elevated temperatures [7,8].…”