Abstract
Graphene aerogel (GA), with low density, high conductivity, and good mechanical properties, has important application potentials in the field of flexible electronics. Here, a balanced approach was developed in this work: Graphene oxide (GO) nanosheets were induced to assemble into a homogeneous porous hydrogel under alkali induction, and then, the oxygen-containing functional groups of GO were removed by reductant of formamidine sulfonic acid (FAS). Besides, the hydrogel of GA precursor can be quickly dried at a high temperature (150 ?) within 30 min to obtain pure GA of FGA. After further calcination, the obtained aerogel of AFGA with ordered structure has ultralow density (3.88 mg/cm(3)), high conductivity (7.4 S/m), supercompression recovery performance (99%), high sensitivity (S = 0.83 kPa(-1)), large reversible compression cycle performance (200 cycles under 90% strain), and high fatigue resistance (10,000 cycles under 70% strain), which presents excellent piezoresistive properties and can find wide applications in piezoresistive sensors as the high-performance sensing material.

Keywords Plus：CHEMICAL-REDUCTIONOXIDEFOAMS

Published in JOURNAL OF MATERIALS SCIENCE；10.1007/s10853-022-08113-8，JAN 2023