PHYSICOCHEMICAL CHARACTERISTICS OF ELECTROCHEMICALLY DEPOSITED MOLYBDENUM SULFIDE AND POLYPYRROLE TETRATHIOMOLYBDATE MOLYBDENUM TRISULFIDE COMPOSITE ELECTRODES

Amorphous molybdenum sulfide and polypyrrole-tetrathiomolybdate/molybd enum sulfide thin films obtained by electrodeposition from aqueous sol utions of ammonium tetrathiomolybdate and pyrrole + ammonium tetrathio molybdate, respectively, have been characterized by elemental analysis , Auger electron spectroscopy, X-ray photoelectron spectroscopy, infra red spectroscopy, and X-ray absorption spectroscopy. Our data revealed that the structure of electrochemically and thermally produced molybd enum trisulfide are identical but that additional sulfur is also prese nt in the electrodeposited material. On the other hand, polypyrrole fi lms grown in the presence of tetrathiomolybdate as the counterion also contains molybdenum trisulfide. Elemental analysis and X-ray absorpti on spectroscopy of polypyrrole-tetrathiomolybdate/molybdenum trisulfid e thin film suggest that 30% of molybdenum is under the MoS42- form an d 70% is present as MoS3.