Ag/gamma W-AlOOH nanocomposites were synthesized by employing gamma-AlOOH as the support for Ag catalyst and then the nanocomposites were used for fabricating nonenzymatic H2O2 sensor. Transmission electron microscopy and scanning electron microscope observations reveal that large numbers of silver nanoparticles were well distributed on the surface of gamma-AlOOH and the electrochemical investigations indicate that the nanocomposites possess an excellent performance toward H2O2. The linear range is estimated to be from 5.0 mu M to 9.0 mM with a low detection limit of 1.1 mu M (S/N = 3), a sensitivity of 64.4 mu A mM(-1) cm(-2) and a response time of 3 S. These results indicated that Ag/gamma-AlOOH nanocomposites were the promising electrocatalytic material for constructing sensors. (C) 2015 Elsevier B.V. All rights reserved.