Study On Preparation? Characterization Of Silver Nanowires And Modification Of TiO₂ Thin Film Batteries

As one of noble metals, Ag nanowires are widely used in electronic circuits, conductive paste electrical materials and antibacterial materials because of their large specific surface area, excellent electrical and thermal conductivity and unique photo-generated electrons directional transfer capabilities. In this study, silver nanowires?Ag NWs?, Ag/CdS nanocomposites and Ag/Ti O₂ light anode material were prepared and systematiccally characterizaed. The photocatalytic properties and photoelectrochemical activities were evaluated. Some key results were obtained as follows:?1? Ag nanowires were synthesized using a method of polyol reduction. The aspect ratio of Ag nanowires is about 110, with an average diameter of 40±10 nm and a length of 5±1 ?m. The effects of seed amount added in the reaction solution on the synthesis of Ag nanostructure were studied. the optimum parameters for preparing the silver nanowires have been concluded after validation: PVP?40000? 2 g, silver nitrate 0.2 g, NaCl?0.1 M / L? 40 ?l, glycol 20 ml, in a thermostated oil bath for 2 h, rection tempreture 165 ?.?2? The photocatalytic properties of Ag/CdS nanocomposites, which were synthesized by chemical method, were greatly improved. The superior performance is attributed to the synergistic effect of Ag and CdS. The photocatalytic ability of Ag/CdS nanocomposites depended on the amount of CdS nanoparticles on the Ag nanowires and the morphology of CdS nanoparticles. When the thickness of CdS nanoparticles was 18 nm, the photocatalytic efficiency of Ag/CdS photocatalyst was seven times higher than that of bare Ag nanowires. When a large number of CdS nanoparticles reunion on Ag nanowire surface will reduce the photocatalytic properties, this is because the agglomerated CdS nanoparticles became recombination centers of photogenerated electrons and holes, increasing the recombination rate.?3? The titanium dioxide slurry was prepared using P25, acetic acid, ethyl cellulose, terpineol, ethanol and deionized water. Then Ag nanowires were added in to prepare Ag/TiO₂ nanocomposite thinfilms. The TiO₂ thinfilm was dense and homogeneous, while the film became porous with silver nanowires. There existed most pores on the nano thinfilm when the weight ratio of silver nanowires was 10%. Dye-sensitized solar cell was assembled using Ag/TiO₂ thinfilms as anode. The light response capability was measured using a digital source and Xenon light. The results indicated that Ag/TiO₂ thinfilms had better light response capability than TiO₂ film. Ag/TiO₂ nano thinfilm with silver nanowires of 10% has the best light response capacity, which is four times than that of TiO₂ films.