Fig. 4: h-BN encapsulation enhances the electrical stability of GGFF against water vapor doping in atmospheric environment. | Nature Communications

Fig. 4: h-BN encapsulation enhances the electrical stability of GGFF against water vapor doping in atmospheric environment.

From: Conformal hexagonal boron nitride encapsulation of graphene-skinned glass fiber fabric for enhanced electrical stability

Fig. 4

Schematics for the labyrinth effect of h-BN barriers for the adsorbed water (a) and the enhanced hydrophobicity of GGFF after h-BN covering (b). c Water contact angle measurement of GFF0, GFF, GGFF, h-BN/GGFF-5, h-BN/GGFF-10, and h-BN/GGFF-15. GFF0 and GFF denote GFF before and after the removal of the polymer layer. GGFF has a graphene thickness of ~1.0 nm, h-BN/GGFF-5, h-BN/GGFF-10 and h-BN/GGFF-15 denote GGFFs encapsulated by h-BN with thickness of ~5.4, ~9.6 and ~15.3 nm, respectively. Inset: Contact angle images of GFF0, GFF, GGFF, h-BN/GGFF-5, h-BN/GGFF-10, and h-BN/GGFF-15. d Resistance changes (ΔR) of GGFF, h-BN/GGFF-5, h-BN/GGFF-10, and h-BN/GGFF-15 upon ~8, ~24, ~48, ~72, ~120, ~168 hours of air exposure ( ~ 25 °C, atmospheric pressure). The size of sample is 5 × 5 cm2. GGFF has graphene thickness of ~1.0 nm, h-BN/GGFF-5, h-BN/GGFF-10 and h-BN/GGFF-15 denote GGFFs encapsulated by h-BN layers with thickness of ~5.4, ~9.6 and ~15.3 nm, respectively. e, f Raman spectroscopy heatmaps of graphene in GGFF and h-BN/GGFF-15 after ~8, ~24, ~48, ~72, ~120, ~168 hours of air exposure (25 °C, atmospheric pressure). g Statistics for the shifts of Raman G and 2D peaks of graphene in GGFF, h-BN/GGFF-5, h-BN/GGFF-10 and h-BN/GGFF-15 after 48 hours of air exposure reletive to the intrinsic peak positions ( ~ 1582 cm−1 (G) and ~2680 cm-1 (2D)). XPS C 1 s spectra of intrinsic GGFF (h) and h-BN/GGFF-15 (i) after 48 hours air exposure. j Resistance testing device for GGFF or h-BN/GGFF under the condition of water droplet deposition. The sample was conformally covered on the curved structure model, and water was sprayed on it. Resistances of GGFF (k) and h-BN/GGFF (l) before and after water spraying. The size of GGFF and h-BN/GGFF is 5 × 10 cm2. GGFF has graphene thickness of ~1.0 nm, and h-BN/GGFF has graphene and h-BN thickness of ~1.0 nm and ~50.4 nm, respectively. The error bars in c, d, k, and l represent the standard deviations (n = 5).

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