Toward Macroscale, Isotropic Carbons with Graphene‐Sheet‐Like Electrical and Mechanical Properties

Abstract

an exponent, n , in the range of 2-4, Figure 4 a shows a density dependence of the modulus for a number of carbon materials, including carbon aerogels, [ 27 ] carbon-nanotube (CNT) assemblies [ 29 ] , graphene, [ 4,10 ] graphene-based materials, [ 18,36,37 ] and graphite. [30][31][32] Figure 4 a shows that the modulus of the GDC scales with density as expected for CNT-or

Highly compressible 3D periodic graphene aerogel microlattices

“…The log–log plot in each case demonstrates the expected power-law density dependence of Young's modulus. In both cases, Young's modulus was found to scale with density as E ∝ ρ 2.5 , consistent with other studies 29 . The similar values of the exponent (∼2.5) indicate both printed and bulk aerogels show the same bending-dominated behaviour under compression.…”

“…Nitrogen porosimetry ( Table 1 ; Supplementary Fig. 3 ) show that the modified formulations maintain a high surface area (700–1,100 m 2 g −1 ) and large mesopore volumes (2–4 cm 3 g −1 ), consistent with the SEM images and comparable to bulk graphene aerogels in the literature 29 30 . Four-probe and density measurements also show that the modified formulations retain a low density and high conductivity characteristic of standard graphene aerogels.…”

“…Raman spectra of the 3D printed graphene aerogels ( Fig. 3a ) all show strong D (1,350 cm −1 ) and G (1,582 cm −1 ) bands with weak, broad D′ and G′ features identical to those previously reported for bulk aerogels 29 30 , suggesting a similar microstructure and defect density. XRD spectra of 3D printed graphene aerogels ( Fig.…”

Hydrothermally Activated Graphene Fiber Fabrics for Textile Electrodes of Supercapacitors

“…(3) Finally, the drying process in ambient condition generated tremendous wrinkles on the rGO sheets and resulted in the hierarchical morphology (Figure 4e), which is similar to that in the literature which reports the fabrication of high density graphene monoliths, 41,45,46 and the crumpling of rGO sheets is thought to be originated from the thermally generated strain on graphene sheets. 48 Different from the as-spun fibers possessing a nearly face-to-face stacking of flat GO sheets, the corrugation of rGO sheets may lead to higher roughness on the fiber surface (Figure 4g) and larger pore volume inside the fiber (Figure 4h); both contribute to the increased SSA.…”

Ductile amorphous boron nitride microribbons

“…Compared to pyrolytic carbon, 35 a-BN is constructed by numerous interlocking nanograins (less than 5 nm in size) with overlapping boundaries and curved h-BN sheets which are connected by the strong covalent-bond linkages at various sites between sheets. 36,37 Furthermore, the layer spacing (∼0.4 nm) in a-BN is slightly larger than 0.335 nm for pristine h-BN, 38 verifying the previously noted relatively curly sheets structure. Besides, as shown in Fig.…”