In this work we have investigated the electrochemical processes by which Pt nanoparticles were included in (Bi,Sb)(2)Te-3 films and submicrometer wires. Solutions containing ions of Bi3+, HTeO2+ and Sb3+ as well as Pt nanoparticles or [PtCl6](2-) ions were used for this study. For comparison, a solution with the same composition in Bi3+, HTeO2+ and Sb3+ ions was used to study the electrodeposition process of (Bi,Sb)(2)Te-3 films and submicrometer wires. Linear and cyclic voltammetry was employed in experiments to find the influences of addition to electrodeposition bath of Pt nanoparticles or [PtCl6](2-) ions on deposition process of (Bi,Sb)(2)Te-3 film. Pt-(Bi,Sb)(2)Te-3 nanocomposites has been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectrometry (EDX) to determine structural, morphological and compositional properties. Two mechanisms for Pt nanoparticles embedding in (Bi,Sb)(2)Te-3 films and wires have been proposed. (c) 2014 Elsevier Ltd. All rights reserved.