Surface functionalized carbon nanotube with polyvinylidene fluoride: Preparation, characterization, current-voltage and ferroelectric hysteresis behaviour of polymer nanocomposite films

Abstract

A comparative study of current-voltage characteristics and ferroelectric properties of polyvinylidene fluoride (PVDF) based nanocomposite films with pure multiwall carbon nanotubes (MWCNTs) and surface functionalized MWCNTs by different type of functionalize groups (-COOH, -OH, -NH 2 ) as filler, was reported. The flexible nanocomposite films based on PVDF and surface modified MWCNTs were fabricated via solution casting method. The current voltage characteristics suggests that -COOH and -OH functionalize MWCNT loading PVDF films are semiconducting in nature whereas raw MWCNT and -NH 2 functionalize MWNCT loading PVDF films are comparatively conducting in nature. Experimental data of current density-electric field were fitted with different existing theoretical models. It is observed that just by changing the functionalization group the electrical conductivity of the composite films significantly changes which is discernible from the current-voltage characteristic. From ferroelectric study the energy density of -COOH, -OH loaded PVDF films are doubled and tripled compare to the pure PVDF film. This work may provide a rout for using different functionalize MWC-NTs into polymer matrix to enhance either the energy density or conducting nature of polymer nanocomposite.

Effect of Multiwalled Carbon Nanotube Reinforcement on the Opto-Electronic Properties of Polyaniline/c-Si Heterojunction

“…The decrease in the optical band gap is mainly due to the interaction between MWCNTs and PANI which causes an increase in the density of localized states in the optical band gap. The lowering of the optical energy band gap suggests an increase in the electrical conductivity and lowering of the Fermi level of the polymer composite films [15].…”

“…The optical band gap was calculated from the linear portion of the UV-vis spectra at the absorption edge using Tauc relation αhν = A(hν − E g ) n , where E g , α, ν and A are the optical band gap, absorption coefficient, frequency and constant, respectively. The power coefficient n determined the type of possible electronic transitions during absorption processes [15]. For direct band transition of the nanocomposites n = 1/2.…”

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

“…At a concentration very near but still below the percolation threshold, a dramatically increased dielectric constant can be achieved in such nanocomposites. Using this approach, various nano‐ or microsized conducting fillers, such as metal nanoparticles, carbon materials (graphene, carbon nanotubes, carbon black), and conductive polymers, have been employed to achieve a high dielectric constant in composite materials.…”

Solution Processable High Performance Multiwall Carbon Nanotube–Si Heterojunctions

“…The CNTs were then purified and functionalized using a boiling acid treatment; [14] this functionalization modifies electrical and optical properties of CNTs. [41][42][43][44][45] To construct a platform for heterojunction devices by applying the CNTs at room temperature, the CNT coatings were made on well-cleaned n-type crystalline silicon (resistivity 0.001-0.005 Ω cm and thickness 500-550 µm) using DC-controlled electrophoretic deposition, as described in detail elsewhere. [14] The required colloidal suspension (10 mL) to enable thin coatings was prepared by diluting a 100 µL stock solution of CNT (1 mg mL −1 in acetonitrile) in 9.9 mL of acetonitrile.…”