M. Sasani Ghamsari

Study on the effects of complex ligands in the synthesis of TiO2 nanorod arrays using the sol–gel template method

This work reports the effects of complex ligands on the synthesis of TiO2 nanorod arrays prepared by the improved sol–gel template method. In this method, the obtained TiO2 sols from the sol–gel process were injected by a syringe into the templates and then the samples were immediately immersed into boiling TiO2-sol solutions. Densely and directionally aligned anatase nanorods of about 80–130 nm diameter and a length of several micrometres were successfully fabricated using an optimal molar ratio of the TiO2 sol. The results show that the molar ratio of the TiO2 sol plays an important role in the morphology and structure of TiO2 nanorods. The reaction between titanium alkoxide and acetylacetone leads to the formation of complex compounds, which can prevent the precipitation of undesired phases from the highly reactive precursors. These complex ligands can be removed after annealing at various temperatures, which depend on the molar ratio of the TiO2 sol.

Preparation and characterization of the lead sulfide nanostructured thin film

lead sulfide nanostructured thin film was prepared from colloidal lead sulfide nanoparticles with natural deposition technique. The size of PbS nanoparticles has been determined in the base of optical absorption spectrum. The influence of preparation method on the film surface morphology was studied by atomic force microscopy, and x‐ray diffraction. Experimental results have shown that the thin film uniformity has been improved when the number of deposited layer increased. Double layered PbS nanothin film has a self assembly morphology and can be used for surface plasmon applications.