▎ 摘　　要

A nanocomposite gel with a uniform porous structure and well-controlled compositions prepared by mixing three-dimensional graphene material with an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, is used for nitric oxide detection. It shows a fast response of less than 4 seconds, an excellent sensitivity of 11.2 mu A cm(-2) (mu mol/L)(-1) and an extremely low detection limit of 16 nM with a signal-to-noise ratio of 3 (S/N=3), a performance superior to that of reported works based on carbon nanotubes and nanoparticles. The high sensitivity is attributed to the large electroactive surface area of the graphene gel nanocomposite towards nitric oxide oxidation. The electrochemical behavior of the gel nanocomposite is investigated and explained.