Poly(m-phenylenediamine) (PmPD) hollow spheres were synthesized for the first time via chemical polymerization of m-phenylenediamine (mPD) monomers by using ammonium persulfate CAPS) as the oxidizing agent in 10 degrees C. Ag nanoparticles (AgNP) was reduced on the hollow spheres PmPD by an AgNO3 aqueous solution in the presence of NaBH4. The Ag nanoparticle-decorated poly(m-phenylenediamine) colloids (AgNP-PmPD) exhibit remarkable catalytic performance toward H2O2 reduction. The corresponding line arrange and detection limit are estimated to be from 0.1 mM to 10 mM (r=0.999) and 0.88 mu M at a signal-to-noise ratio of 3. (C) 2013 Elsevier Ltd. All rights reserved.