Papers by Keyword: Solid Film

Abstract: In this work, high quantum yield nanodots were produced by using an organosilane as a coordinating solvent and fabricated the product into solid films. In order to assess the practicality as a material for optoelectronic device, solid state properties were analyzed extensively including UV stability and thermal stability.

Abstract: Titania (TiO₂) Films Having Dense and Solid Microstructure Were Prepared by Laser Chemical Vapor Deposition Using CO₂ Laser. The Effects of Deposition Temperature (T_dep) and Total Chamber Pressure (P_tot) on Phase and Microstructure of TiO₂ Films Were Investigated. At P_tot = 600 Pa and T_dep = 790 K, Rutile TiO₂ Film Had a Polygonal Platelet Grains 2 μm in Size. At P_tot = 600 Pa and T_dep = 1010 K, Rutile TiO₂ Film Had (110) Orientation and Consisted of a Truncated Polyhedron 5–6 μm in Size. At P_tot = 200 Pa and T_dep = 955 K, Rutile TiO₂ Film Has a Solid Columnar Having Faceted Surface. A Dense and Solid TiO₂ Film Was Obtained at P_tot = 200 Pa and T_dep = 1120 K. The Deposition Rate of TiO₂ Solid Film Was Reached 240 μm h⁻¹.

Abstract: Citrate gold nanoparticles of 13.5 nm average diameters have been synthesized by Turkevich method and further functionalized by place exchange reaction using mercaptosuccinic acid (MSA), 1,4-benezenedimethanethiol (1,4BDMT) or mercaptoundecanoic acid (MUA) as the incoming ligands. In the first case, the functionalization of the gold clusters with MSA yielded solution of blue color and large aggregates on carbon grids. Moreover, after filtration and drying, any film formed by hydrogen bonding, could not be removed from the filter, being embedded into the filter texture. The second ligand used for the place exchange reaction, the 1,4BDMT, determined the change of the solution color from red to dark purple, and generation of a purple powder but no film formation. In the third case, the purification and drying of the MUA functionalized gold clusters yielded films of purple color with homogenous composition, robustness, soft topographies and remarkable optical properties which were dependent on their thicknesses. The Au-MUA NP films obtained are new, being generated by hydrogen bonding and having features which makes them very attractive for the fabrication of optoelectronic devices. The long alkyl chained thiol proved to be the adequate ligand for film synthesis.