Understanding Crystallization of Anatase into Binary SiO2/TiO2 Sol−Gel Optical Thin Films: An in Situ Thermal Ellipsometry Analysis

2011 ◽  
Vol 115 (7) ◽  
pp. 3115-3122 ◽  
Author(s):  
Benjamin Louis ◽  
Natacha Krins ◽  
Marco Faustini ◽  
David Grosso
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Tio2 Sol

Chemical Analyses of Sol/Gel Surfaces and Thin Films

1984 ◽  
Vol 32 ◽  
Author(s):  
Carlo G. Pantano ◽  
C. A. Houser ◽  
R. K. Brow
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Silica Films ◽  
Alumina Films ◽  
Surface Analysis Techniques ◽  
Relative Water ◽  
Temperature Programmed

ABSTRACTThe application of surface analysis techniques to the characterization of sol/gel surfaces and thin films is described. Secondary-ion mass spectroscopy (SIMS), x-ray photoelectron spectroscopy (XPS) and sputter-induced photon spectroscopy (SIPS) are used to measure the composition of multicomponent silicate films, the relative water content of alumina films, the nitrogen content of ammonia treated silica films, and the depth profiles for films on black chrome. The determination of chemical structure using XPS and SIMS is also discussed. Finally, a brief introduction to temperature-programmed desorption (TPD) and its potential for studying surface chemical reactions, in situ, is presented.

scholarly journals Wood surface modification by in-situ sol-gel deposition of hybrid inorganic–organic thin films

2007 ◽  
Vol 4 (4) ◽  
pp. 483-490 ◽  
Author(s):  
Mandla A. Tshabalala ◽  
Li-Piin Sung
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Wood Surface ◽  
Sol Gel ◽  
Organic Thin Films

Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

1988 ◽  
Vol 121 ◽  
Author(s):  
Mariquita A. Accibal ◽  
Jonathan W. Draxton ◽  
Allen H. Gabor ◽  
Wayne L. Gladfelter ◽  
Beth Anne Hassler ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxides ◽  
Coordination Compounds ◽  
Sol Gel ◽  
High Tc ◽  
Superconducting Metal ◽  
Zero Resistance ◽  
Gel Preparation ◽  
Sol Gel Synthesis

ABSTRACTA comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

Phase Transformations in Sol-Gel PZT Thin Films

2000 ◽  
Vol 623 ◽  
Author(s):  
D.P. Eakin ◽  
M.G. Norton ◽  
D.F. Bahr
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Room Temperature ◽  
Structural Changes ◽  
Sol Gel ◽  
Ex Situ ◽  
Ambient Conditions ◽  
Crystalline Films ◽  
In Situ Heating

AbstractThin films of PZT were deposited onto platinized and bare single crystal NaCl using spin coating and sol-gel precursors. These films were then analyzed using in situ heating in a transmission electron microscope. The results of in situ heating are compared with those of an ex situ heat treatment in a standard furnace, mimicking the heat treatment given to entire wafers of these materials for use in MEMS and ferroelectric applications. Films are shown to transform from amorphous to nanocrystalline over the course of days when held at room temperature. While chemical variations are found between films crystallized in ambient conditions and films crystallized in the vacuum conditions of the microscope, the resulting crystal structures appear to be insensitive to these differences. Significant changes in crystal structure are found at 500°C, primarily the change from largely amorphous to the beginnings of clearly crystalline films. Crystallization does occur over the course of weeks at room temperature in these films. Structural changes are more modest in these films when heated in the TEM then those observed on actual wafers. The presence of Pt significantly influences both the resulting structure and morphology in both in situ and ex situ heated films. Without Pt present, the films appear to form small, 10 nm grains consisting of both cubic and tetragonal phases, whereas in the case of the Pt larger, 100 nm grains of a tetragonal phase are formed.

scholarly journals Structural evolution and hydrogen sulfide sensing properties of NiTiO3–TiO2 sol–gel thin films containing Au nanoparticles

2011 ◽  
Vol 176 (9) ◽  
pp. 716-722 ◽  
Author(s):  
Enrico Della Gaspera ◽  
Mattia Pujatti ◽  
Massimo Guglielmi ◽  
Michael L. Post ◽  
Alessandro Martucci
Keyword(s):  
Thin Films ◽  
Hydrogen Sulfide ◽  
Au Nanoparticles ◽  
Sol Gel ◽  
Structural Evolution ◽  
Sensing Properties ◽  
Tio2 Sol

Crystallization behavior of SiO2−TiO2 sol-gel thin films

1997 ◽  
Vol 8 (1-3) ◽  
pp. 409-413 ◽  
Author(s):  
Rui M. Almeida ◽  
Eva E. Christensen
Keyword(s):  
Thin Films ◽  
Crystallization Behavior ◽  
Sol Gel ◽  
Tio2 Sol

Nonlinear Optical Behavior of Transparent Nanohybrids of Nanocrystalline TiO2 in Poly(methyl methacrylate) Prepared by In Situ Sol-Gel Polymerization Technique

2005 ◽  
Vol 23 ◽  
pp. 367-370
Author(s):  
A.H. Yuwono ◽  
J.M. Xue ◽  
J. Wang ◽  
H.I. Elim ◽  
Wei Ji ◽  
...  
Keyword(s):  
Thin Films ◽  
Methyl Methacrylate ◽  
Nonlinear Optical ◽  
Sol Gel ◽  
Nanocrystalline Tio2 ◽  
Pump Probe ◽  
Poly Methyl Methacrylate ◽  
Ultrafast Relaxation ◽  
Quartz Substrates

Nanohybrid thin films consisting of nanocrystalline TiO2 particles in poly(methyl methacrylate)(PMMA) were successfully synthesized by in-situ sol-gel and polymerization assisted by spin coating. Using titanium isoproproxide (Ti-iP), methyl methacrylate (MMA) and 3-(trimethoxysily)propyl methacrylate (MSMA) as the starting materials, nanohybrids containing up to 60% Ti-iP in PMMA were realized. The resulting nanohybrid thin films coated on quartz substrates are optically transparent and demonstrate nonlinear optical behaviour, where their nonlinear absorption increases with the loading of Ti-iP in PMMA, as confirmed by Z-scan measurements. Using pump-probe technique, these thin films are shown to exhibit an ultrafast relaxation time of ~1.5 picosecond.

Microstructural Evolution of TiO2 Sol-Gel Thin Films

1990 ◽  
Vol 180 ◽  
Author(s):  
J.L. Keddie ◽  
E.P. Giannelis
Keyword(s):  
Thin Films ◽  
Relative Density ◽  
Microstructural Evolution ◽  
Sol Gel ◽  
Dynamic Vacuum ◽  
Tio2 Sol ◽  
Sol Gel Films ◽  
Deposited Films ◽  
Deposition Conditions

ABSTRACTBackscattering spectrometry has been used to determine the density of TiO2 sol-gel films. The density of the as-deposited films relative to that of anatase varies slightly with respect to deposition conditions and is approximately 0.5. Annealing at temperatures as high as 750°C increases the relative density to 0.7 with concomitant decreases in the O:Ti ratio and H content but it does not result in complete densification. Film densities are consistently higher for films annealed under dynamic vacuum compared to those in air.

In situ sol–gel fabrication of new poly(amide–ether–imide)/titania (TiO2) nanocomposite thin films containing l-leucine moieties

2010 ◽  
Vol 289 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Hojjat Seyedjamali ◽  
Azadeh Pirisedigh
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Nanocomposite Thin Films

scholarly journals Double layer SiO2–TiO2 sol–gel thin films on glass for antireflection, antifogging, and UV recoverable self-cleaning

2020 ◽  
Vol 59 (25) ◽  
pp. 7720
Author(s):  
F. M. Fardo ◽  
R. S. Ribeiro ◽  
J. A. Strauss ◽  
J. Nardi ◽  
L. C. Ferreira ◽  
...  
Keyword(s):  
Thin Films ◽  
Double Layer ◽  
Sol Gel ◽  
Tio2 Sol ◽  
Self Cleaning
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