Synthesis, characterization, gas sensing, and electrical property evaluation of polyaniline/copper‐alumina nanocomposites

Abstract

A series of organic‐inorganic hybrid of polyaniline (PANI)/copper‐alumina (Cu‐Al2O3) nanocomposites were prepared by in situ polymerization technique. The structural, morphological and thermal properties of PANI with different contents of nano Cu‐Al2O3 were characterized by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction analysis (XRD), scanning electron microscopy (SEM), high‐resolution transmission electron microscope (HR‐TEM), differential scanning calorimetry (DSC), and thermogravimteric analysis. The dielectric constant, dielectric loss and the AC conductivity were measured using a dielectric analyzer in a frequency ranging from 100 Hz to 1 MHz. Also, current (I)‐voltage (V) characteristics and gas sensing performance of the composites were studied in detail. The FTIR spectra of composite exhibited the IR band of nanoparticles in the macromolecular chain of PANI. The XRD pattern showed the systematic arrangement of Cu‐Al2O3 particles in the molecular structure of polyaniline. The SEM and TEM images indicated that the nanoparticles were sheathed by polyaniline. DSC results showed that incorporation of Cu‐Al2O3 accelerated the glass transition temperature of PANI. TG analysis demonstrated the enhancement in thermal stability of PANI/Cu‐Al2O3 nanocomposite relative to the base polymer. Conductivity studies showed that both AC and DC conductivity, dielectric constant, and dielectric loss increased with increase in the concentration of nanoparticles up to 5 wt%. Similarly, the ammonia gas sensing behavior of nanocomposites was also improved by the addition of Cu‐Al2O3 nanoparticles.

Copper alumina @ poly (aniline-co-indole) nanocomposites: synthesis, characterization, electrical properties and gas sensing applications

“… 20 Bandgar et al 21 developed a flexible PANI/α-Fe 2 O 3 nanocomposite with high NH 3 gas selectivity. In previous research, 22,23 we found that PANI/Cu–Al 2 O 3 and PIN/Cu–Al 2 O 3 had excellent electrical, thermal and ammonia gas sensing properties. The synergistic interaction of Cu–Al 2 O 3 with the polar entity of a conducting polymer is the basis of their superior properties.…”

“… 23 PANI- co -PIN/Cu–Al 2 O 3 has a stronger initial gas sensitivity response than PANI/Cu–Al 2 O 3 nanocomposites. 22 …”

Fluorinated SnO2/ER as an antistatic coating for enhancing the surface insulating strength of epoxy insulators

“…[1][2][3][4] The GIL disk insulator is mainly made of epoxy resin composites doped with micro-Al 2 O 3 with a mass fraction of 60%, which has guaranteed the thermal, mechanical, and basic insulation requirements for the insulator. [5][6][7] However, the doping of Al 2 O 3 fillers has also reduced the surface insulation performance. Due to the obstruction of charge transport brought by filler Al 2 O 3 , the surface of the insulator would accumulate a large amount of net charge under longterm action of DC electric field, which would aggravate the distortion of surface electric field, thus to induce the accidents of flashover.…”

“…The flashover accident of the disk insulator can be the most severe one 1–4 . The GIL disk insulator is mainly made of epoxy resin composites doped with micro‐Al 2 O 3 with a mass fraction of 60%, which has guaranteed the thermal, mechanical, and basic insulation requirements for the insulator 5–7 . However, the doping of Al 2 O 3 fillers has also reduced the surface insulation performance.…”

Natural rubber and copper alumina nanocomposite‐based flexible elastomer‐inorganic hybrid systems

“…[4] The doping of copper into alumina (Cu-Al 2 O 3 ) not only increases the compatibility of hybrid with the polymer matrix but also improved the conductivity, thermal stability, and corrosion resistance. [5] Natural rubber (NR) is a fascinating rubber product that is naturally available. It is extensively used in the fabrication of tires, adhesives, coatings, surgical gloves, health equipment, and vehicle accessories.…”