Large-area reduced graphene oxide thin film with excellent thermal conductivity and electromagnetic interference shielding effectiveness

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

“…In contrast, O 1S peak intensity in rGO/PVDF-HFP sample is negligible (Figure 3b), which strongly demonstrate that oxygen containing functional groups from GO sur- reduction of GO to rGO. 13,32,33 Interestingly, in both GO and rGO composite films, top side shows very high F 1S peak than bottom side, which again confirmed the asymmetric distribution of graphene in matrix and confirmed the formation of asymmetric graphene/PVDF-HFP composite film. Figure 3c show the recorded the XRD patterns of the GO and rGO composite films from both surface sides.…”

“…The 2θ peak shift from 9.6 o to 24.0 o or 9.8 o to 24.2 o confirms that the GO sheets were well reduced. 13 It would be interesting to see the recorded XRD patterns from both surface of composite film. Inset of Figure 3c clearly shows that XRD patterns recorded from top and bottom surface have distinguishable difference in their patterns.…”

“…The shielding effectiveness could be expressed by equation; SE R = −10 log 10 (1 − R), SE A = −10 log 10 T (1 − R) , and SE T = SE A + SE R . 13 Figure 4 shows the recorded EMI SE of asymmetric conducting composite film in X-band (8.2 to 12 GHz) frequency. The composite film revealed EMI shielding of SE Total , SE R , and SE A to be ∼ 30, 10, and 20 dB, respectively.…”

“…13,[26][27][28][29] Then, obtained aqueous GO dispersion was dispersed in highly polar organic solvents, dimethylformamide (DMF) by using solvent exchange procedure. 30 Further, the PVDF-HFP pellets were individually dissolved into DMF solvent.…”

“…[9][10][11][12][13][14][15][16][17][18] However, there is still lack of flexible and light weight shielding materials, which is required for current electronics/devices. Graphene-based composite materials have been attracted a significant research interest due to their remarkable properties including low density, high surface area, large aspect ratios, versatile processing, ultrahigh electrical conductivity and excellent mechanical stiffness.…”