Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Waczyński

Materials Science-Poland

et al. 2014

SnO 2 nanocrystalline thin films have been deposited on oxidized silicon substrates by spin-coating from a precursor solution, followed by slow thermal annealing in oxygen atmosphere at different temperatures (500 to 900°C). The precursor solution consisted of 1.0 to 2.0 M SnCl 4 ·5H 2 O in isopropanol. It was shown that the concentration of the precursor solution, annealing temperature and heating rate had a significant effect on the structural, optical and electrical properties of the studied thin films. The topography of SnO 2 thin films was examined by scanning electron microscopy (SEM). Furthermore, as-deposited films were characterized by X-ray diffraction (XRD), UV-Vis and impedance spectroscopy.

Section: Resultsmentioning

confidence: 99%

Electrical and optical properties of spin-coated SnO2 nanofilms

Waczyński

Materials Science-Poland

et al. 2014

“…Hydrochloric acid (HCl) was used as a catalyst. In the sol-gel method of film fabrication the following stages are distinguished: 9 , 11 , 14 - 16 …”

Section: Methodsmentioning

confidence: 99%

The effects of a SiO₂coating on the corrosion parameters cpTi and Ti-6Al-7Nb alloy

et al. 2014

The aim of this paper was to evaluate the usefulness of the sol-gel method application, to modificate the surface of the Ti6Al7Nb alloy and the cpTi titanium (Grade 4) with SiO2 oxide, applied on the vascular implants to improve their hemocompatibility. Mechanical treatment was followed by film deposition on surface of the titanium samples. An appropriate selection of the process parameters was verified in the studies of corrosion, using potentiodynamic and impedance method. A test was conducted in the solution simulating blood vessels environment, in simulated body fluid at t = 37.0 ± 1 °C and pH = 7.0 ± 0.2. Results showed varied electrochemical properties of the SiO2 film, depending on its deposition parameters. Correlations between corrosion resistance and layer adhesion to the substrate were observed, depending on annealing temperature.

“…The details concerning fabrication technology of the silica titania and titania lms are given in Ref. [11,21]. The morphological parameters of the investigated composite waveguide as well as of the parent slab waveguide are schematically presented in Fig.…”

Section: Composite Structurementioning

confidence: 99%

Sensing Properties of Four-Layered Planar Waveguides - Theoretical Analysis

Tyszkiewicz

2012

Acta Phys. Pol. A

Optical waveguides are the fundamental components of chemical and biochemical evanescent wave sensors. Presented work focuses on the theoretical investigations of homogeneous sensitivity of four-layered composite planar waveguide composed of a silicatitania lm and a titania lm deposited on a glassy substrate in order of citing. Characteristics of a homogeneous sensitivity and a fundamental modes homogeneous sensitivity dierence of such a structure are compared with the ones for a three-layered waveguide composed of silicatitania waveguiding lm. Therefore the inuence of a high refractive index titania lm on homogeneous sensitivity characteristics of three-layered structure is given. It was shown that homogeneous sensitivity dierence of fundamental modes of four-layered waveguide can be optimized with respect to thicknesses of each layer. For each value of a cover refractive index there exists the minimal thickness of the titania layer which maximizes the homogeneous sensitivity dierence of fundamental modes.