【摘要】 采用纳米碳管液相氧化开壁技术制备氧化石墨烯纳米带,以氧化石墨烯纳米带为前驱体,Pickering乳液为模板,聚醚胺(D400)为助剂和交联剂,制备孔径均匀可控的石墨烯纳米带气凝胶。采用光学显微镜、电子显微镜对乳液的形貌、粒径及气凝胶微观结构进行表征,研究乳液模板对石墨烯纳米带气凝胶结构和性质的影响。结果表明,在乳液水油比为7∶1时,所得气凝胶具有均匀的孔结构、优异的可压缩性能,在应变50%的情况下,压缩1 000次后仍能恢复。当应变增大到95%时,循环50次依然能恢复原状。该气凝胶具有良好的压阻特性,气凝胶的电阻与形变之间有良好的线性对应关系,且与压缩速率无关。更多还原

【Abstract】 Graphene-based aerogels have attracted considerable attention because of their excellent properties, such as low density, high porosity, large specific surface area, and outstanding electrical conductivity, with promising use in the fields of sensors, catalysis, and energy-related storage. Here graphene nanoribbons were prepared by unzipping carbon nanotubes. Graphene nanoribbon aerogels were fabricated using Pickering emulsions as the soft template and poly(propylene glycol)bis(2-aminopropyl ether)(D400) as the co-surfactant and cross-linker. It was shown that aerogels prepared from an emulsion with a water/oil ratio of 7∶1 have a uniform pore structure and excellent mechanical properties. The aerogels exhibit remarkable shape recovery after compression/release tests for 1 000 cycles at 50% strain. The structure can fully recover even after compression/release tests for 50 cycles at a 95% strain. The electrical conductivity of the aerogels is proportional to the strain regardless of the strain rate.更多还原