The Influence of silver nanoparticles on TiO2 with alpirin dye: optical and structural study
Keywords:Photoactivity, alpirin, titanium dioxide
Sol-gel derived Titanium (iv) oxide (TiO2) was deposited on to substrate glass using the screen printing technique. Silver nanoparticles (AgNPs) were deposited unto the TiO2 samples through the successive ionic layer adsorption and reaction method. The samples were soaked into the novel alpirin and were investigated. The films were characterized by Surface Profilometry, Ultraviolet –Visible light Spectroscopy (UV-Vis Spec) X-ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS). The Surface Profilometry indicates that the samples were thin films. XRD results showed crystalline structure of titanium dioxide. Crystal phase observed for TiO2 soaked in alpirin dye and the sample that served as control are anatatase structure. The average crystallite size of titanium dioxide when soaked into Alpirin was found to be with average dislocation density of and band gap of 2.52 eV. However, the film with the combination AgNPs + Alpirin, has the average crystallite size of with average dislocation density of and the band gap of 2.00 eV as against the pure TiO2 with average crystalline size of and average dislocation density of and band gap of 3.65 eV. Optical absorbance for pure TiO2 was low but increased when soaked with Alpirin and AgNPs + Alpirin. The results showed that all the films have high transmittance within the visible and near infra red region though there was slight decrease when soaked with Alpirin and AgNPs + Alpirin. Absorption coefficient, extinction coefficient and optical conductivity increased on soaking with Alpirin and increased further when soaked with AgNPs + Alpirin. The synergy between AgNPs + Alpirin show that the incorporation of metal nanoparticle is beneficial for enhanced photoactivity. The presence of silver and some other substances in the sample were confirmed through Energy Dispersive x-ray Spectrometry (EDS).
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