High-strength scalable graphene sheets by freezing stretch-induced alignment

Recent Advances in Graphene Electronic Skin and its Future Prospects

“…Graphene is often used as the sensing material of sensors due to its unique mechanical properties and electronic transmission characteristics. On the nanoscale level, it has a fracture strength of 130 GPa and Young's modulus of 1.0 TPa, but its macroscopic mechanical properties are much lower than this [74] . In order to obtain an e‐skin with good flexibility, wide stretchable range, and high sensitivity, it is necessary to deal with the sensing material.…”

Multi-Scale Structure–Mechanical Property Relations of Graphene-Based Layer Materials

“…On the other hand, Dai et al [ 151 ] observed a significant enhancement in modulus of the GPs up to 84% by applying cyclic dynamic loading at a low strain amplitude of 0.1% (see Figure 11 b), which was attributed to the straightening and reorientation of GO sheets in dynamic loading. Based on a similar idea, Wan et al [ 145 ] proposed a freeze stretching strategy where static bi-axial load was applied to the sample, and covalent and π–π bonds were introduced to the inter-platelet space, which produced a strength up to 1.55 GPa. Furthermore, by introducing solvent plasticizers, Li et al [ 143 ] developed a plasticizer-assistant stretching method to straighten the wrinkles of direct-casted GO papers.…”

Chemical Strategies for Making Strong Graphene Materials

“…After immersion in aw ater bath, the continuous and uniform sheets of GO-calcium alginate nanocomposite were collected (Figure 4a). In this process,t he strong [1,[29][30][31][32][33][34][35][36][37][38][39][40][41][42] Angewandte shear-flow force induced by superspreading improves the degree of orientation of the GO platelets (Figure 4b)and was as high as 0.89 in the graphene sheets (Figure 4c). The obtained nanocomposite sheet comprised of GO,c lay,a nd carbon nanotubes (CNTs) showed the highest tensile strength of about 1215 MPa and amodulus of 198.8 GPa.…”

“…Recently,W an et al reported that ultrastrong graphene sheets could be prepared by freezing stretch-induced alignment with interface interactions. [34] As shown in Figure 8a, sequentially bridged (SB) and biaxially stretched (BS) methods have been developed for the preparation of ultrastrong graphene sheets based on interface interactions during the polymerization of 10,12-pentacosadiyn-1-ol (PCO,C H 3 -Angewandte (CH 2 ) 11 C C À C C(CH 2 ) 8 CH 2 OH), and p-p stacking induced by 1-pyrenebutyric acid N-hydroxysuccinimide ester (PSE) and AP molecules.W ith the assistance of biaxial stretch, the alignment of the graphene platelets in SB-BS-rGO sheets was dramatically enhanced, with ah igher Hermanso rientation factor (0.956) than that of ap ure rGO sheet (0.810). Moreover,s canning electron microscopy could show the compact nature of the resultant SB-BS-rGO sheet (Figure 8b).…”

“…Recently,s everal strategies have been developed to fabricate strong graphene materials by eliminating the voids and wrinkling in the assembly procedure.T hese strategies include filling, [31] dewrinkling, [32] asynergistic strategy, [33] and freezing stretch-induced alignment. [34] In this Minireview,w e first focus on these recently developed strategies.T hen some representative applications that require high mechanical properties,s uch as electromagnetic interference shielding, thermal conductivity,and flexible supercapacitors,are briefly Graphene materials have been widely applied in various fields because of their remarkable mechanical and electrical properties. However,two obstacles arise during the assembly of graphene platelets into macroscale graphene materials and composites that impair the performance of the resultant graphene materials:1)the voids between the graphene platelets,a nd 2) the wrinkling of the graphene platelets.…”