Enhanced mechanical, thermal, and electric properties of graphene aerogels via supercritical ethanol drying and high-temperature thermal reduction

Abstract

Graphene aerogels with high surface areas, ultra-low densities and thermal conductivities have been prepared to exploit their wide applications from pollution adsorption to energy storage, supercapacitor, and thermal insulation. However, the low mechanical properties, poor thermal stability and electric conductivity restrict these aerogels’ applications. In this paper, we prepared mechanically strong graphene aerogels with large BET surface areas, low thermal conductivities, high thermal stability and electric conductivities via hydrothermal reduction and supercritical ethanol drying. Annealing at 1500 °C resulted in slightly increased thermal conductivity and further improvement in mechanical properties, oxidation temperature and electric conductivity of the graphene aerogel. The large BET surface areas, together with strong mechanical properties, low thermal conductivities, high thermal stability and electrical conductivities made these graphene aerogels feasible candidates for use in a number of fields covering from batteries to sensors, electrodes, lightweight conductor and insulation materials.

Magnetic graphene oxide grafted with different hydrophobic chain lengths low‐generation polyamidoamine dendrimers for adsorption of Pb(II) and Hg(II) in aqueous solution

“…The average pore sizes of MGO‐NH 2 , MGO‐PAMAM‐G1.0, HMGO‐NH 2 , and HMGO‐PAMAM‐G1.0 are 6.8536, 5.9751, 15.5569, and 15.4874 nm, respectively, indicating the existence of mesoporous. Moreover, based on the BET model, the BET surface area of HMGO‐NH 2 (48.7298 m 2 ·g −1 ) and HMGO‐PAMAM‐G1.0 (44.4232 m 2 ·g −1 ) are much less than MGO‐NH 2 (112.7007 m 2 ·g −1 ) and MGO‐PAMAM‐G1.0 (126.3983 m 2 ·g −1 ) due to the formation of longer hydrophobic chain resulted in its average pore size increased . The above comparative analysis could provide a basis for subsequently exploring the adsorption mechanism of samples.…”

Carbon Nanotube and Graphene Aerogels – The World’s 3D Lightest Materials for Environment Applications: A Review

“…The graphene aerogel can recover completely after more than 90% compression [5]. Recently, Cheng et al reported that 75.0 mg graphene aerogel cylinder could support a 2kg counterpoise, at least 26000 times their own weight as can be seen in the figure 6 [11]. Figure 6.…”

“…Figure 6. CNT &Graphene Aerogels are extremely elastic, bouncing back after being compressed [5,11]. f).…”

High-Performance Thermal Management Nanocomposites: Silver Functionalized Graphene Nanosheets and Multiwalled Carbon Nanotube

“…This combination microstructure was designed to provide an even greater opportunity to enhance λ due to a significantly higher intrinsic λ (about 3000 W/mK) of GNS and MWCNT [23][24][25][26][27][28][29][30] than that of other high-thermal conductivity ceramic fillers, such as aluminium nitride (AlN) and boron nitride (BN). Moreover, AgNPs were chosen because of their high thermal conductivity of Ag (λ = 429 W/(mK)) [6,24]. AgNPs functionalized GNS and MWCNT showed a higher σ in functionalized fillers, forming a more effective thermally conductive network and hence, lowering the ITR effect.…”