In the present work, silver nanoparticles (Ag 0 ) were synthesized under γ-irradiation from silver nitrate (AgNO 3 ) precursor salt, at room temperature in aqeous medium without adding any kind of catalyst. When aqueous solution of AgNO 3 , the surfactant poly vinyl alcohol and the isopropanol (or formic acid), which were used as hydroxyl oxidative radical scavengers agents were exposed to γ rays, Ag + ions were reduced to metallic Ag 0 by reactive organic radicals generated under irradiation. When using 2-propanol as free OH • radical scavenger in polyvinyl alcohol, which prevents Ag 0 from aggregation, densely dispersed silver nanoparticles coalesce to give 15 nm sized silver nanoparticles. The use of formic acid as free OH • radical scavenger leads to the production of 32 nm sized metallic nanoparticles. The effects of hydroxyl oxidative radical scavengers agents on the morphology and the size of produced silver nanoparticles were investigated.
In the present investigation, a three-step electrochemical as a novel method has been applied to fabricate multinanoporous thin film electrodes of pure TiO 2 and the doped Pt-TiO 2 (of approximately 15 nm) from the titanium sheet using sulfuric acid as electrolyte and chloroplatinic acid as platinum dopant precursor. Characterization techniques so far discussed in this work revealed that the fabricated products corresponded to pure TiO 2 and to the doped Pt-TiO 2 respectively. The prepared Pt-TiO 2 thin film electrodes have photoresponse to visible light, which indicates a new possibility for improving intrinsic TiO 2 photoresponse.
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