Gas‐Induced Reversible Dispersion/Aggregation of Graphene

摘要: The low dispersibility of graphene in water, given its hydrophobic nature, is considered a serious problem that limits use. Here, we describe method to stably disperse using dispersant containing tertiary amine and pyrene group. modifies the surface via π–π stacking, allowing it be dispersed water. undergoes hydrophobic–hydrophilic transition upon being stimulated by CO2 N2, exhibiting faster response (reaction time 1.5 min) lower recovery temperature (40 °C) than those compounds with amidine-like structures. We found modified this gas-sensitive exhibited reversible dispersion/aggregation behavior bubbling/removal CO2. proposed simple one for stimulating gas should suitable fabricating sensors, drug-delivery systems, “smart” surfaces, switching devices.