Structural and light coupling characteristics of patterned silica–titania sol–gel thin films with/without nano gold coatings

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 109218-109233 ◽  
Author(s):  
Saswati Sarkar ◽  
Rik Chattopadhyay ◽  
Sunirmal Jana
Keyword(s):  
Thin Films ◽  
Soft Lithography ◽  
Sol Gel ◽  
Nano Gold ◽  
Light Coupling ◽  
Coupling Characteristics ◽  
Titania Sol

Soft lithography-based 1-dimensional/2-dimensional patterned silica–titania sol–gel thin films with/without nano-Au coatings and their light coupling characteristics.

Microstructural Evolution of Titania Sol-Gel Thin Films

1994 ◽  
Vol 346 ◽  
Author(s):  
Yongan Yan ◽  
S. Ray Chaudhuri ◽  
Din-Guo Chen ◽  
Barry Bolker ◽  
Arnab Sarkar
Keyword(s):  
Thin Films ◽  
Anatase Phase ◽  
Sol Gel ◽  
Structural Evolution ◽  
Dip Coating ◽  
Force Microscopy ◽  
Grain Sizes ◽  
Atomic Force ◽  
Sol Gel Process ◽  
Titania Sol

ABSTRACTThin films of crystalline titania with different grain sizes and porosities were prepared by dip-coating on Si (100) substrates starting from a sol-gel process. Three synthesis procedures were developed and compared, using acetylacetone (acac, with HCI) and acetic acid (HOAc) as modifying agents or directly using hydrochloric acid as catalyst. The structural evolution of the films was characterized by Glazing Angle X-ray Diffraction (XRD), Spectroscopic Ellipsometry and Atomic Force Microscopy (AFM). Anatase phase was observed on all of the films calcined at 440° C. The grain sizes and crystallinity generally increased with calcination temperature. Thin films obtained from acac- and HOAc-modified titanium sols had fine grains (50–80 nm) and less porosity (<10%) after calcination at 1000° C. Thin films derived from the sol catalyzed directly with acid had the largest grains (90–130 nm), higher crystallinity and greater porosity (17%).

Sintering kinetics of silica-titania sol-gel films on silicon wafers

1996 ◽  
Vol 11 (2) ◽  
pp. 353-357 ◽  
Author(s):  
Xin Min Du ◽  
Rui M. Almeida
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Spin Coating ◽  
Sol Gel ◽  
Full Density ◽  
Sintering Behavior ◽  
Sintering Kinetics ◽  
Titania Sol ◽  
Sol Gel Films ◽  
Kinetics Of

The sintering behavior of 80SiO2–20TiO2 sol-gel thin films on Si wafers, prepared by spin coating, was studied by the calculation of density as a function of temperature, from refractive index measurements and the Lorenz–Lorentz relationship. The sintering kinetics of the films were fit to the Mackenzie and Shuttleworth model, over the temperature range of 700 °C–850 °C. Using this model, the viscosity was determined as a function of temperature. These gel films sintered to full density at 850 °C.

Effect of Deposition Voltage on Microstructure and Optical Properties of TiO2 Thin Film via Electrophoretic Deposition

2012 ◽  
Vol 576 ◽  
pp. 586-589 ◽  
Author(s):  
Saber Ghannadi ◽  
H. Abdizadeh ◽  
M. Golobostanfard
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Sol Gel ◽  
Visible Region ◽  
Diffraction Field ◽  
Tio2 Thin Films ◽  
Vis Spectroscopy ◽  
Titania Sol

In this study nanocrystalline anatase TiO2 thin films were prepared by electrophoretic deposition of titania sol at various applied voltages. The well-known sol-gel method was used to prepare the titania sol. The influence of applied voltage on the structure, morphology and optical properties of thin films has been characterized by X-ray diffraction, field emission scanning electron microscopy and UV-Vis spectroscopy. The results show that the thickness of the films formed on the substrate increases with increasing the applied voltage. However, with increasing the thickness of the films, the cracks increased and the transparency reduced in the visible region.

scholarly journals Shallow Angle X-Ray Diffraction from In-Situ Silica: Titania Sol-Gel Thin Films

1996 ◽  
Vol 228-231 ◽  
pp. 525-530
Author(s):  
J.S. Rigden ◽  
R.J. Newport ◽  
M.E. Smith ◽  
P.J. Dirken
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Silica ◽  
Titania Sol

Photocatalysis Property of Titania-Based Thin Films with Covalent Grafting PANi as Sensitizer

2012 ◽  
Vol 549 ◽  
pp. 470-473 ◽  
Author(s):  
Hong Quan Liu ◽  
Fang Lian ◽  
Lin Zhang ◽  
Meng Liu
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Sol Gel ◽  
Composite Films ◽  
Tetrabutyl Titanate ◽  
Porous Films ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Covalent Grafting ◽  
Titania Sol

Polyaniline sensitized titania thin film were fabricated by spin-coating from Ti-precursor containing PEG as surfactant via a sol-gel technique, in which titania-sol was synthesized by hydrolysis of tetrabutyl titanate in water-alcohol solution. The films were characterized by X-ray diffraction, high resolution transmission electron microscopy, field-emission scanning electron microscopy, thermal gravity-differential scanning calorimetry, and tested under self-made photocatalysis instrument. The results showed the synthesized porous films provided the active surfaces for self-polymerization of aniline. Compared with bare TiO2 thin films, the composite films displayed a enhanced photocatalytic activity and could be the potential photocatalyst for indoor air decontamination or self-cleaning films.

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

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