Fabrication and exploration the structural, optical, and dielectric properties of PVP/CMC/MWCNTs/ZnWO4 blends

The composite of zinc tungstate (ZnWO4) and multi-walled carbon nanotubes (MWCNTs) demonstrated remarkable performance in supercapacitors and lithium-ion batteries. In this study, novel polymeric nanocomposites (PVP/CMC/MWCNTs/x wt.% ZnWO4) were synthesized using solution casting and hydrothermal techniques. The resulting blends and filler ZnWO4 were thoroughly characterized using X-ray diffraction and transmission electron microscopy techniques. Utilizing diffuse reflectance measurements, various optical parameters were analyzed. Upon the introduction of MWCNTs/ZnWO4 into the PVP/CMC blend, its transmittance in the visible range experienced a reduction from ∼90 % to (15–30 %), while the reflectivity and absorptivity increased. The direct and indirect optical band gaps of PVP/CMC blend changed nonmonotonically upon loading with MWCNTs and ZnWO4. The linear and nonlinear optical parameters were enhanced. Also, the fluorescence (FL) intensity exhibited a decline, and analysis of CIE chromaticity indicated that the blends are emitting blue light to different extents and the purity of the blend decreased from 71 % to 60 % when loaded with MWCNTs and 2.5 wt.% ZnWO4. From the dielectric measurements, the AC conductivity exhibited an increase, while the energy density experienced a reduction upon the incorporation of ZnWO4. In general, the optical and dielectric characteristics of the current blends render them suitable for implementation in optoelectronic and energy storage applications.