School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
Small. 2013 Apr 22;9(8):1397-404. doi: 10.1002/smll.201202965. Epub 2013 Mar 20.
Aerogels, an extremely important aggregation state of various self-assembled nanoscale building blocks, have great potential in fields ranging from energy storage to thermal insulation. However, the porosity of aerogels makes them mechanically weak in most cases, and the chemical activity of the resulting aerogel needs consideration. Herein, chemically crosslinked graphene oxide (GO) 3D aerogels with large specific surface areas (up to 850 m(2) g(-1) ), outstanding mechanical performance (up to 20 MPa Young's modulus, 1 MPa yield strength and 45 J g(-1) specific energy adsorption), and superhigh chemical activity (toward some reducing gases such as H2 S, HI, and SO2 ), are fabricated by assembling 2D GO sheets edge-to-edge into uniform, 3D hydrogel networks with subsequent supercritical fluid drying. These aerogels are superior to other 3D frameworks (e.g. graphene aerogels) assembled via partial overlapping of the basal planes of the 2D building blocks.
气凝胶，一种各自行组装纳米级结构单元的极其重要的聚集态，在从储能到保温等领域具有巨大的潜力。然而，气凝胶的多孔性使得它们在大多数情况下机械强度较弱，并且需要考虑所得气凝胶的化学活性。在此，通过组装二维 GO 片层边缘到边缘形成均匀的 3D 水凝胶网络，然后进行超临界流体干燥，制备出具有大比表面积（高达 850 m(2) g(-1) ）、优异机械性能（高达 20 MPa 的杨氏模量、1 MPa 的屈服强度和 45 J g(-1) 的比能量吸附）和超高化学活性（对一些还原性气体如 H2 S、HI 和 SO2 ）的化学交联氧化石墨烯（GO）3D 气凝胶。这些气凝胶优于其他通过二维构建块的基面部分重叠组装的 3D 框架（例如石墨烯气凝胶）。
