Abstract
Abstract Graphene and carbon nanotube (CNT) aerogels provide combinations of mechanical, thermal, and electrical properties that are interesting for a variety of applications. In this work, the impact of three different reducing agents (l-ascorbic acid (LAA), \HI\ and NaHSO3) and carbon nanotubes on the morphologies and properties of the graphene aerogels (GAs) are studied systematically. Additional, the impact of thermal annealing at 450 °C for 5 h under Ar environment is also investigated. Annealing treatment and the addition \CNTs\ enhance the electrical conductivities of the \GAs\ up to a factor of 5. Thermal annealing impacts the surface area of the GAs. Specifically, the surface areas of those reduced by \HI\ and NaHSO3 decreased by 30%, while those reduced by ŁAA\ or dispersed with \CNTs\ increased by 15%. The thermal conductivity of the highly porous \GAs\ is measured using an improved infrared microscopy technique to be ∼0.10 W/(m K). The optimization of the nanostructures and properties of the \GAs\ is important for various applications, such as energy storage devices and nanocomposites.
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