Ultra-fine Pt nanoparticles supported on ionic liquid polymer-functionalized ordered mesoporous carbons for nonenzymatic hydrogen peroxide detection

Poly(ionic liquid) (PIL) coated ordered mesoporous carbons (OMCs) were prepared by in situ polymerization of 3-ethyl-1-vinylimidazolium tetrafluoroborate ([VEIM]BF4) monomer on OMCs matrix. PIL on the surface of OMCs can provide sufficient binding sites to anchor the precursors of metal ion. PIL/OMCs were employed as support material for the deposition and formation of ultra-fine Pt nanoparticles, via the self-assembly between the negative Pt precursor and positively charged functional groups of PIL-functionalized OMCs. The combination of the unique properties of each component endows Pt/PIL/OMCs as a good electrode material. Compared with the Pt/OMCs nanocomposite, the Pt/PIL/OMCs modified electrode displays high electrocatalytic activity towards hydrogen peroxide (H2O2) and gives linear range from 1.0 x 10(-7) to 3.2 x 10(-3) M (R = 0.999). The Pt/PIL/OMCs responds very rapidly to the changes in the level of H2O2, producing steady-state signals within 4-5s. A high sensitivity of 24.43 mu A mM(-1) and low detection limit of 0.08 mu M was obtained at Pt/PIL/OMCs modified electrode towards the reduction of H2O2. The improved activity makes Pt/PIL/OMCs nanocomposite promising for being developed as an attractive robust and new electrode material for electrochemical sensors and biosensors design. (C) 2011 Elsevier B.V. All rights reserved.