Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

Abstract

Here, novel poly(1-naphthylamine)-tungsten disulphide (PNA-WS 2 ) nanocomposites were synthesized through an in-situ chemical oxidative polymerization of 1-naphthylamine in the presence of ultrasonically dispersed WS 2 . The effect of WS 2 addition on the optoelectrical, morphological and thermal properties of PNA was studied by using different analytical tools. SEM images revealed that PNA aggregates are well supported on the dispersed WS 2 sheets. The formation of a fibrous network of PNA over the dispersed WS 2 layers evidenced from the TEM images has suggested larger surface area and better interfacial interaction between PNA and incorporated WS 2 layers . The thermal stability was improved upon the incorporation of WS 2 . Optical bandgap values of PNA-WS 2 nanocomposites were lower than that of bulk WS 2 and pristine PNA. Electrical and dielectric studies have confirmed an improvement in conductivity and dielectric properties with increasing WS 2 content, which was credited to the better charge transport between the polar backbone of PNA and charged surface of dispersed WS 2 due to enhanced interfacial area and electrostatic interactions between the components. A maximum AC conductivity of 4.4 × 10 -3 Sm −1 was displayed by nanocomposite containing 20% WS 2 loading and a further increase in WS 2 content showed a detrimental effect in electrical and dielectric properties. The present study has demonstrated that optical and dielectric properties of composites can be readily tuned by proper control of the composition and dispersion of WS 2 within the PNA matrix.

Near‐infrared light responsive dendrimers facilitate the extraction of bicalutamide from human plasma and urine

“…Also, the remaining weight loss at about 380-450 • C is ascribed to the carbonization of the grafted polymeric branches onto the WS 2 nano-sheets. [33][34][35] The data obtained from TGA pattern confirmed that the surface modification of the WS 2 nano-sheets has been accomplished.…”

“…The findings were similar to the other reports. [32,33] Based on the MNA thermogram, three steps of the weight loss were detected for the synthesized MNA. The first weight loss at about 80-100 • C is ascribed to the evaporation of the adsorbed water from WS 2 particles.…”

Poly(1-Napthylamine) Nanoparticles as Potential Scaffold for Supercapacitor and Photocatalytic Applications

“…The observed UV-Vis spectrum exhibited wide absorbance peaks in the visible range centered at ~510 nm. The presence of a well-defined peak at 510 nm in the UV-Vis absorption spectrum was due the polaronic n−π * transitions [21,40,43]. Figure 4b shows a typical Tauc's plot for the as-synthesized PNA nanoparticles.…”

Fabrication of ternary polyaniline‐titanium dioxide‐polypyrrole (PANI‐TiO2‐PPy) nanocomposite as an efficient polymer electrode for supercapacitors

“…This further affirms the improved energy storage capacity of PANI-TiO 2 -PPy electrode. Figure 12b displays the charge-discharge curves of PANI-TiO 2 -PPy electrode at different current densities (6,8,10,12, and 14 A g À1 ). The GCD curves of fabricated ternary electrode exhibits an asymmetrical shape over the range of current densities that confirm the pseudocapacitive charge storage mechanism.…”

“…More recently, researchers are focusing on various combinations of pseudocapacitive materials (conducting polymers and transition metal oxides) to ensure their possible use as efficient electrode materials that can drastically improve the device's energy density along with power density. 5 Many conducting polymer based active electrode materials, namely polyaniline (PANI), 6 polythiophene (PTh), 7 polypyrrole (PPy), 8 polyindole (PIN), 9 poly(o-phenylenediamine) (PoPD), 10 poly(naphthylamine) (PNA), 11 polycarbazole (PCz), 12 polyanisidine (PANIS), 13 poly (3,4-ethylenedioxythiophene) (PEDOT), 14 poly(para-phenylene) (PPP), 15 poly(phenylenevinylene) (PPV), 16 polyfuran (PF), 17 poly(acetylene) (PAC), 18 poly(p-phenylene sulfide) (PPS), 19 and poly(p-phenylene vinylene) (PPV) 20 have been explored in the past. Among the mentioned conducting polymers, PANI and PPy based electrode materials have received much attention in high-performance supercapacitors as they possess distinctive characteristics such as good intrinsic conductivity, increased electrochemical activity and high energy density.…”