Study On The Preparation And Properties Of Nano-compound Semiconductor Cu₂O/TiO₂and PANI/TiO₂

TiO₂nanotube arrays were successfully fabricated by the situ template method inthe substrate of the AAO template. Cu₂O/TiO₂and PANI/TiO₂coaxial nanowiresarrays were fabricated by potentiostatic method. The morphology and structurecharacterization of the coaxial nanowires arrays were investigated with scanningelectron microscopy （SEM）, transmission electron microscopy （TEM） and X-raydiffraction （XRD）. The photoelectric conversion performance of the composites wastested through the light open circuit potential curve. The photoelectrocatalyticdegradation performance of PANI/TiO₂coaxial nanowires arrays was investigatedthrough the degradation of the refractory organic dye rhodamine B.TiO₂nanotube arrays were successfully fabricated by the situ template method.The length and diameter of the nanotubes can be controlled by the thickness and poresize of AAO template. The optimal reaction conditions were as follows:0.1mol/L forelectrolytes concentration,30℃for reaction temperature, and60min for reaction time.The results of TEM measurements showed that the nanotubes were prepared.The TiO₂nanofilms were fabricated by the sol-gel method and the PANI/TiO₂nanocomposite thin films were deposited on the TiO₂nanofilm electrode by theelectrochemical workstation. Cu₂O nanowires and PANI nanowires were deposited inthe TiO₂nanotube. The Cu₂O/TiO₂and PANI/TiO₂coaxial nanowires arrays werefabricated. The optimal reaction conditions of Cu₂O/TiO₂were as follows:0.4mol/LCuSO₄·5H₂O+3mol/L lactic acid for electrolytes concentration,60℃for reactiontemperature and-0.3V（vs.SCE） for oxidation potential. The optimal reactionconditions of PANI/TiO₂were as follows:1.0mol/L HCl+0.5mol/L aniline forelectrolytes concentration,0.8V（vs.SCE） for oxidation potential and800s for reactiontime. The results of TEM measurements showed that the nanowires and the nanotubeswere well composed.The results of photoelectric response showed that the open circuit potential of thecoaxial nanowires arrays electrode was greater than the TiO₂nanotubes arrayselectrode, under the lighting conditions of the UV light source. Doping of the Cu₂Oand polyaniline could effectively improve the photoelectric response. The results ofphotoelectrocatalysis degradability experiments indicated that the degradability of thePANI/TiO₂coaxial nanowires arrays were much better than the TiO₂nanotubes arrays electrode. And the degradability was better under the more applied voltage and thelower pH of the solution during the degradation.