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, -NH2) 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 –NH2 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 MWCNTs into polymer matrix to enhance either the energy density or conducting nature of polymer nanocomposite.
Highlights
INTRODUCTIONResearchers work on carbon nanotube (CNT), graphene oxide (GO) modified semicrystalline polymers such as polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), polyaniline (PANI), polypyrrole etc.[18,19,20,21,22,23,24,25] and explain the charge conduction mechanism through the composites
Research on dielectric film has been intensified recently due to its potential application in semiconductor industries for generation of non-volatile memories and logic gates.[1,2,3,4] The gate dielectric of metal-oxide-semiconductor field effect transistors (MOSFETs), the capacitor dielectric of dynamic random access memories (DRAMs) and the tunnelling dielectric of Flash memories are the most important part of integrated circuits (ICs)
We have successfully prepare β-phase polyvinylidene fluoride (PVDF) and different type functionalize multiwall carbon nanotubes (MWCNTs) embedded β-phase PVDF films and focus the importance of environmental condition to prepare these type of films
Summary
Researchers work on carbon nanotube (CNT), graphene oxide (GO) modified semicrystalline polymers such as polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), polyaniline (PANI), polypyrrole etc.[18,19,20,21,22,23,24,25] and explain the charge conduction mechanism through the composites. The metallic or semiconducting conductivity of MWCNT depends on the helicity and its diameter.[31,32] In case of functionalize MWCNT the effective diameter may be varying which change the electrical nature of MWCNTs. In case of composite system MWCNTs can serve as charge storage system inside the organic insulator matrix. From current density – electric field (J-E) characteristic we explain details carrier conduction mechanism within pure and MWCNT embedded films. As per knowledge for the first time explain the effect of functionalization group on the electrical properties of MWCNTs embedded PVDF films in the temperature window of 300 ≤ T ≤ 413K. We focus on the ferroelectric properties of dielectric films
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