Co-doped ZnO–PVA Nanocomposite for EMI Shielding

Abstract

The paper describes the mechanical properties and electromagnetic shielding (EMI) of Co doped ZnO-Poly(vinyl alcohol) (PVA) nanocomposite. Significant improvements in mechanical properties can be obtained by incorporating inorganic nano fillers. The EModulus and tensile strength were found to be enhanced with the increase in the doping concentration of Co .05 Zn .95 O incorporated in PVA matrix. Further, we have observed that EMI of the composite filled with 2 wt% concentration of Co .05 Zn .95 O in the PVA matrix exhibited utmost reflection loss of -47.31 dB in the bandwidth 8-12 GHz which may be attributed to good compatibility of dielectric and magnetic properties of materials. Downloaded by [University of Sussex Library] at 12:06 24 August 2015 2

Synergistic effect of hybrid hydroxylated boron nitride and cellulose nanocrystals for enhancing the thermal, mechanical, and hydrophobic properties of composite film

“…Figure 10 shows typical tensile stress–strain curves for neat PVA film and BN/CNC/PVA composite film. The tensile strength of neat PVA film is 45.6 MPa which is near to the reported value of 44.5 MPa by Singh et al [ 106 ] The maximum percentage strain at break of neat PVA film is 36%, which is also near to the reported value by Singh et al [ 106 ] The tensile strength of CNC/PVA film and BN/PVA film for the same weight of PVA is 44 MPa and 40 MPa (Figure S8). This shows that the higher loading of BN or CNC alone for the same weight of PVA deteriorates the tensile strength of the film.…”

Mechanical, Optical, and Thermal Properties of SnS2-Filled PVA Composites

“…The composites demonstrated linear stress-strain behavior up to failure and plastic deformation, as well as equivalent curve morphologies for plain and nanofiller composites(19). Additionally, the simultaneous enhancement in the tensile strength and elongation was ascribed to the homogeneous dispersion of SnS2 particles in the PVA/SnS2 structure(20).…”

Recent advancements in the electromagnetic interference shielding performance of nanostructured materials and their nanocomposites: a review

“…Dielectric materials and their composites have also been used in blocking incoming EM waves. 406–437 Lu et al 406 studied the thickness dependence variation of reflection loss against ε ′ and ε ′′ (Fig. 18(a)) and microwave absorption properties of the composites loaded with 10 wt% ZnO@MWCNTs vs. the frequency and thickness at different temperatures (Fig.…”

“…425 EMI SE measurements in the 8–12 GHz frequency range on Co-doped ZnO (Co 0.05 Zn 0.95 O) in PVA prepared by the reflux method exhibited a reflection loss of −47.31 dB. 426 This was considered to be an outcome of the good compatibility of the dielectric and magnetic properties of materials. The minimum reflectivity values of thermally and mechanically stable composites comprising 10 wt% loaded Fe 2 O 3 , ZnO, SiO 2 , ZrO 2 , and TiO 2 in the PVA matrix correspond to −38.85 dB (10.4 GHz), −33.65 dB (10.4 GHz), −41.90 dB (10.4 GHz), −24.90 dB (11.0 GHz), and −32.90 dB (9.76 GHz), respectively.…”