Porous InP membranes have been prepared by anodization of InP wafers with electron concentration of 1 x 10(17) cm(-3) and 1 x 10(18) cm(-3) in a neutral NaCl electrolyte. The internal surfaces of pores in some membranes were modified by electrochemical deposition of gold in a pulsed voltage regime. Photoluminescence and photosensitivity measurements indicate efficient light trapping and porous surface passivation. The photoluminescence and electrical resistivity of the membranes are sensitive to the adsorption of H-2 and CO gas molecules. These properties are also influenced by the deposition of Au nanoparticles inside the pores. (C) 2010 Elsevier B.V. All rights reserved.