Facile visual colorimetric sensor based on iron carbide nanoparticles encapsulated in porous nitrogen-rich graphene.

Herein, via one-step pyrolysis of glucose, dicyandiamide (DCDA) and Fe containing metal-organic framework (Fe-MOF), small FeC nanoparticles were in-situ decorated in 3D porous network of N-rich graphene (NGr). The Fe-MOF served as size regulating precursor, layered g-CN (derived from pyrolysis of DCDA) acted as not only a template to guide the growth of small FeC nanoparticles, but also the carbon source for 3D porous NGr network. The intrinsic peroxidase-like catalytic activity of FeC/NGr was unpredictably discovered, by taking the oxidation reaction of 3,3',5,5'-tetramethylbenzidine (TMB) with HO as a protocol. Fast and distinguished color change, improved stability in exposure to extreme HO concentration and high temperature were obtained. The Michaelis-Menten kinetics was investigated. The detection of glucose was accomplished over a wide concentration range of 2.0~500.0μM with a detection limit lower than most of other similar systems. The reliability of the present sensor was further evaluated by practical monitoring glucose in diluted serum samples. Low cost and simple preparation, fast and distinguished color change, high tolerance to extreme HO concentration and high temperature, endow FeC/NGr as one of the promising materials for fast visual colorimetry.