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.

Sol-gel synthesis of textured lanthanum titanate thin films

2003 ◽  
Vol 18 (2) ◽  
pp. 357-362 ◽  
Author(s):  
Mary M. Sandstrom ◽  
Paul Fuierer
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Optical Measurements ◽  
Layered Perovskite ◽  
Orientation Factor ◽  
Anisotropic Structures ◽  
Sol Gel Films ◽  
Sol Gel Synthesis

Control over crystallographic orientation in thin films is important, particularly with highly anisotropic structures. Because of its ferroelectric nature, the layered perovskite La2Ti2O7 has interesting piezoelectric and electrooptic properties that may be exploited when films are highly textured. Sol-gel films with an orientation factor of greater than 95% were fabricated without relying on epitaxial (lattice-matching) growth from the substrate. Film orientation and crystallization were confirmed by x-ray diffraction, scanning electron microscopy, atomic force microscopy, and optical measurements. The particle sizes in all precursor solutions were measured by dynamic light scattering experiments. Experimental results indicate that film orientation is a function of precursor solution concentration, size of the molecular clusters in the solution, and film thickness.

Photocatalytic degradation of trichloroethylene in the gas phase over TiO2 sol-gel films: Analysis of products

Chemosphere ◽  
1998 ◽  
Vol 36 (3) ◽  
pp. 483-495 ◽  
Author(s):  
Jong-Soon Kim ◽  
Kiminori Itoh ◽  
Masayuki Murabayashi
Keyword(s):  
Photocatalytic Degradation ◽  
Gas Phase ◽  
Sol Gel ◽  
Tio2 Sol ◽  
Sol Gel Films

Ten Analyses Of Sol-Gel Derived And Sputtered PZT Thin Films

1990 ◽  
Vol 200 ◽  
Author(s):  
Cheng-Chen Hsueh ◽  
Martha L. MeCartney
Keyword(s):  
Thin Films ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Rf Magnetron Sputtering ◽  
Pzt Thin Films ◽  
Ferroelectric Domains ◽  
Metal Organic ◽  
Organic Precursors ◽  
Acid Catalyzed ◽  
Sol Gel Films

ABSTRACTFerroelectric PZT thin films were prepared by sol-gel methods and RF magnetron sputtering. Sputtered PZT fast fired at 650° for 30 minutes showed microporosity. For the sol-gel route, solution precursors had a significant effect on the microstructure of the crystalline PZT films. PZT thin films derived from metal-organic precursors dissolved in n-propanol were observed to have large and microporous spherulitic grains on the order of 2 μm and phase separation in acetic acid-catalyzed films. In contrast, PZT precursors originated from alcohol exchanges with 2-methoxyethanols resulted in dense films with fine grains of ∼0.2 μm and clear evidence of ferroelectric domains. The dense sol-gel films possessed superior dielectric and ferroelectric properties.

Investigation of the Structural and Microstructural Characteristics of Sol-Gel Derived Lead Lanthanum Titanate Thin Films

1999 ◽  
Vol 596 ◽  
Author(s):  
S. B. Majumder ◽  
S. Bhaskar ◽  
P. S. Dobal ◽  
A. L. Morales. Cruz ◽  
R. S. Katiyar
Keyword(s):  
Thin Films ◽  
Acetic Acid ◽  
Electrical Properties ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Sharp Decrease ◽  
Modified Technique ◽  
Lanthanum Titanate ◽  
La Addition ◽  
Deposited Films

AbstractIn the present work we have studied the characteristics of Pb1.05-xLaxTil-x/4O3 ( x= 0 to 30 at%) thin films prepared by acetic acid and methoxy-ethanol based sol-gel techniques. We have found that higher intermediate temperature fired films (x=0.15), prepared by acetic acid modified technique yielded (100) textured growth with improved dielectric properties. It has been argued that homogeneous mixing of the film constituents in the sol is influenced by the choice of the precursor materials and preparation methodology which in turn controls the growth characteristics and electrical properties. Lanthanum as a dopant has a pronounced influence on the structure, microstructure and electrical properties of the deposited films. In the Raman spectra, the soft E(1TO) phonon shifts towards the lower frequency with a sharp decrease in its intensity and a tetragonal to cubic structural transformation (for 26.5 at % La) was observed at room temperature. In the ferroelectric composition range (up to 15 at % La doping), we have observed a significant improvement of ferroelectric properties with the La addition.

Microstructural evolution of sol–gel derived ZnO thin films

2010 ◽  
Vol 518 (23) ◽  
pp. 6792-6798 ◽  
Author(s):  
James B. Miller ◽  
Hsin-Jung Hsieh ◽  
Bret H. Howard ◽  
Esteban Broitman
Keyword(s):  
Thin Films ◽  
Microstructural Evolution ◽  
Sol Gel ◽  
Zno Thin Films

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

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

Modification of Sol-Gel Thin Films By Ion Implantation

1994 ◽  
Vol 346 ◽  
Author(s):  
Hiroshi Hirashima ◽  
Kenji Adachi ◽  
Hiroaki Imai
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Ion Implantation ◽  
Sol Gel ◽  
The Other ◽  
Ir Absorption ◽  
Absorption Bands ◽  
Chemically Modified ◽  
Sol Gel Films ◽  
Ion Species

ABSTRACTIn order to densify and to improve the physical properties, TiO2 sol-gel films, about 100 nm in thickness, on silica glass or silicon wafer were implanted with Ar+ or B+ ions. The refractive index of the as-dried films increased and the IR absorption band of OH disappeared after Ar+ implantation. Drying and densification of sol-gel films were enhanced by Ar+ implantation. On the other hand, the refractive index and the thickness of the films hardly changed with B+ implantation. However, IR absorption bands of B-O bond were observed after B+ implantation. This suggests that sol-gel films could be chemically modified by ion implantation with reactive ion species.

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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