Effect of heat treatment on the optical properties of sol–gel-derived, fully dielectric solar control coatings on glass

2016 ◽  
Vol 13 (4) ◽  
pp. 623-628 ◽  
Author(s):  
S. Manasa ◽  
R. Subasri
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Sol Gel ◽  
Solar Control

Optical Properties of ATO Sol-gel Coated Carbon Fibers

2012 ◽  
Vol 1454 ◽  
pp. 221-226
Author(s):  
Brandon Richard ◽  
Norma Alcantar ◽  
Andrew Hoff ◽  
Sylvia Thomas
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Carbon Fibers ◽  
Sol Gel ◽  
Functional Materials ◽  
Additional Material ◽  
Heat Treated ◽  
Ft Ir ◽  
Recent Trends ◽  
Thermal Infrared Radiation

ABSTRACTRecent trends in composite research include the development of structural materials with multiple functionalities. In new studies, novel materials are being designed, developed, modified, and implemented into composite designs. Typically, an increase in functionality requires additional material phases within one system. The presence of excessive phases can result in deterioration of individual or overall properties. True multi-functional materials must maintain all properties at or above the minimum operating limit. In this project, samples of Sb-doped SnO2(ATO) sol-gel solutions are used to coat carbon fibers and are heat treated at a temperature range of 200 – 500 °C. Results from this research are used to model the implementation of sol-gel coatings into carbon fiber reinforced multifunctional composite systems. This research presents a novel thermo-responsive sol-gel/ (dopant) combination and evaluation of the actuating responses due to various heat treatment temperatures. While ATO is a well-known transparent conductive material, the implementation of ATO on carbon fibers for infrared thermal reflectivity has not been examined. These coatings serve as actuators capable of reflecting thermal infrared radiation in mid-range and near-range wavelengths (λ). By altering the ATO sol gel thickness and heat treatment temperatures, optimal optical properties are obtained. While scanning electron microscopy (SEM) is used for imaging, electron diffraction spectroscopy (EDS) is used to verify the compounds present in the coatings. Fourier transform infrared (FT-IR) spectroscopy was performed to analyze the reflectivity in the infrared spectra and analyze the crystal structures after heat treatments.

scholarly journals Physical and optical properties of sol-gel nano-silver doped silica film on glass substrate as a function of heat-treatment temperature

2003 ◽  
Vol 93 (12) ◽  
pp. 9553-9561 ◽  
Author(s):  
Wenyan Li ◽  
Sudipta Seal ◽  
Edward Megan ◽  
Jeff Ramsdell ◽  
Kirk Scammon ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Glass Substrate ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Silica Film ◽  
Treatment Temperature ◽  
Nano Silver

Heat-treatment controlled structural and optical properties of sol-gel fabricated Eu:ZnO thin films

2017 ◽  
Vol 64 ◽  
pp. 288-294 ◽  
Author(s):  
Subhabrata Ghosh ◽  
Uma Mahendra Kumar K. ◽  
B.N. Shivakiran Bhaktha
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Optical Properties ◽  
Sol Gel ◽  
Structural And Optical Properties

scholarly journals Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

Ceramics ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 274-286 ◽  
Author(s):  
Masato Isogai ◽  
Alexander Veber ◽  
Maria Cicconi ◽  
Tomokatsu Hayakawa ◽  
Dominique de Ligny
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Energy Transfer ◽  
Rare Earth ◽  
Sol Gel ◽  
Glass Ceramics ◽  
High Concentration ◽  
Energy Applications ◽  
Doped Glasses ◽  
The Media

Optical and structural properties of glasses and glass-ceramics (GC) obtained by different heat-treatment of Tb and Tb-Yb doped sol-gel derived 30ZrO2-70SiO2 materials were investigated. A glass was formed after treatment at 700 °C whereas devitrification of the media after the treatment at 1000 and 1100 °C, led to the formation of GC containing up to three different crystalline phases, namely, tetragonal ZrO2, Yb-disilicate and cristobalite. The modification of the optical properties through the heat treatment was caused by redistribution of the rare earth elements (REE) among the different phases: both Tb and Yb entered the t-ZrO2 lattice, Yb can also be present in the form of a Yb2Si2O7 crystal. Devitrification led to an increase in Tb→Yb energy transfer efficiency as compared to the glass, though it was higher in the samples heat-treated at 1000 °C than in those treated at 1100 °C. The most intensive Yb3+ luminescence, induced by the energy transfer from the Tb3+ ion, was observed at the interface between t-ZrO2 and the glassy phases, due to the high concentration of REE in this area caused by the inability of ZrO2 to accept larger amounts of the REE. The mechanisms of the Tb→Yb energy transfer vary between different phases of the GC. The results obtained in this study are important for the development of spectral down-converters for potential solar energy applications based on Tb-Yb co-doped glass-ceramics.

scholarly journals Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 660
Author(s):  
Susana Devesa ◽  
Joana Rodrigues ◽  
Sílvia Soreto Teixeira ◽  
Aidan P. Rooney ◽  
Manuel P. F. Graça ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
High Energy ◽  
Site Symmetry ◽  
Photoluminescence Spectra ◽  
Heat Treated ◽  
Red Color ◽  
Optical Activation

Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were prepared by the citrate sol–gel method and heat-treated at temperatures between 700 and 1600 °C. ErNbO4 revealed a spherical-shaped crystallite, whose size increased with heat treatment temperatures. To assess their optical properties at room temperature (RT), a thorough spectroscopic study was conducted. RT photoluminescence (PL) spectroscopy revealed that Er3+ optical activation was achieved in all samples. The photoluminescence spectra show the green/yellow 2H11/2, 4S3/2→4I15/2 and red 4F9/2→4I15/2 intraionic transitions as the main visible recombination, with the number of the crystal field splitting Er3+ multiplets reflecting the ion site symmetry in the crystalline phases. PL excitation allows the identification of Er3+ high-energy excited multiplets as the preferential population paths of the emitting levels. Independently of the crystalline structure, the intensity ratio between the green/yellow and red intraionic transitions was found to be strongly sensitive to the excitation energy. After pumping the samples with a resonant excitation into the 4G11/2 excited multiplet, a green/yellow transition stronger than the red one was observed, whereas the reverse occurred for higher excitation photon energies. Thus, a controllable selective excited tunable green to red color was achieved, which endows new opportunities for photonic and optoelectronic applications.

Effect of Heat Treatment on Coloration of Ag Doped TiO2-SiO2 Films

2007 ◽  
Vol 336-338 ◽  
pp. 1793-1795
Author(s):  
Wen Yue Bi ◽  
Li Wang ◽  
Xin Gang Yu ◽  
Xing Dong Zhang ◽  
Hong Quan Bao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Visible Spectroscopy ◽  
Silica Films ◽  
Gel Method ◽  
Uv Visible ◽  
Xrd Patterns ◽  
Doped Titania

Silver doped titania-silica films were fabricated by two-step route of sol-gel method using Ti(OC4H9)4, Si(OC2H5)4 and AgNO3 as the precursor materials. The films were annealed at temperature from 350°C to 560°C for a period of time ranging from 15min to 90 min. Optical properties of the films were characterized by UV-visible spectroscopy and the state of silver in the titania-silica films was investigated by XRD patterns. It was found that the annealing temperature and time have considerably influenced the coloration of the films, and with the increase of annealing temperature the [111] orientation of silver crystal occurred which make the color of silver doped titania-silica films deepened. The coloration stability of the silver doped titania-silica films was also investigated.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

Sign in / Sign up

Export Citation Format

Share Document