writer：Y. F. Zhang, W. Gao, L. Z. Zuo, L. S. Zhang, Y. P. Huang, H. Y. Lu, W. Fan*, T. X. Liu*
keywords：Graphene, Polyimide, Nanocomposites, Carbon aerogels, Fe2O3 Nanoparticles, Dopamine detection
source：期刊
specific source：Adv. Mater. Interfaces, 2016, 3(15), 1600137.
Issue time：2016年
It is very important to develop a simple, effi cient, and scaleable method for detection of dopamine (DA) with high sensitivity and selectivity to diagnose some serious neurological diseases. Herein, electro-catalysts for detection of DA are simply prepared based on Fe₂O₃ nanoparticles (NPs) decorated on highly porous carbon aerogels (CAs), which are derived from KOH activated graphene-polyimide aerogels. In the hierarchical nanocomposites (NCs), CAs provide large specific surface area, abundant mesopores, and macropores, and many sites for in situ growth of Fe₂O₃ NPs, thus effectively preventing the aggregation of Fe₂O₃ NPs. Moreover, CAs with 3D interconnected porous structures are able to shorten the charge transfer pathways through the intimate interaction between CAs and Fe₂O₃ NPs. Therefore, when applied as electro-catalysts for detection of DA, the optimized NC exhibits rapid amperometric response and a low detection limit of 0.109 × 10^-6 M (S/N = 3), with a wide linear concentration range from 5 to 500 × 10^-6 M . In addition, the oxidation peak of DA can be readily distinguished from the interference of uric acid and ascorbic acid. Therefore, the highly porous CAs derived from KOH activated graphene-polyimide aerogels are excellent substrates for in situ growth of Fe₂O₃ NPs, exhibiting high electrocatalytic activity for DA detection.