Nanocrystalline spin coated sol–gel hydroxyapatite thin films on Ti substrate: Towards potential applications for implants

Abstract Recently, the rise of two dimensional amorphous nanostructured thin films have ignited a big interest because of their intriguingly isotropic structural and physical properties leading to potential applications in the nano-optoelectronics. However, according to literature, most of optoelectronic properties are investigated on chalcogenides related heterostructures. This has motivated the present work aiming to provide a new platform for the fabrication, examination of the properties and the applications of 2D nanostructured thin films based on epoxy/silicone blend. Thin films of Epoxy/Silicone loaded with nitrogen doped carbon nanotubes (N-CNTs) were prepared by sol-gel method and deposited on Indium Tin Oxide (ITO) glass substrates at room temperature. Further examination of optical properties aimed the investigation of optical pseudo-gap and Urbach energy and enabled the determination of processed films thickness based on Manifacier and Swanepol method. The results indicated that the unloaded thin films have a direct optical transition with a value of 3.61 eV followed by noticeable shift towards narrowing gaps depending on the loading rate. Urbach's energy is 0.19 eV for the unloaded thin films, and varies from 0.43 to 1.33 eV for the loaded thin films with increasing the rate of N-CNTs. It is inversely variable with the optical pseudo-gap. Finally, Epoxy/Silicone loaded with N-CNTs nanocomposites films can be developed as active layers with specific optical characteristics, giving the possibility to be used in electro-optical applications.

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Sol-Gel Derived Cds Nanocrystalline Thin Films: Optical and Photoconduction Properties

Materials Science-Poland ◽

10.1515/msp-2018-0028 ◽

2018 ◽

Vol 36 (2) ◽

pp. 235-241 ◽

Cited By ~ 4

Author(s):

Ziaul Raza Khan ◽

Anver Aziz ◽

Mohd. Shahid Khan ◽

Keyword(s):

Thin Films ◽

Band Gap ◽

Sol Gel ◽

Hexagonal Wurtzite Structure ◽

Solution Temperature ◽

Nanocrystalline Phase ◽

Glass Substrates ◽

Coating Method ◽

Potential Applications ◽

Nanocrystalline Thin Films

Abstract High-quality CdS nanocrystalline thin films were grown by sol-gel spin coating method at different solution temperatures on glass substrates. As-deposited films exhibited nanocrystalline phase with hexagonal wurtzite structure and showed good adhesion and smooth surface morphology. It was clearly observed that the crystallinity of the thin films improved with the increase in solution temperature. Crystallites sizes of the films also increased and were found to be in the range of 10 mm to 17 nm. The influence of the growth mechanism on the band and sub-band gap absorption of the films was investigated using UV-Vis and photothermal deflection spectroscopy (PDS). The band gap values were calculated in the range of 2.52 eV to 2.75 eV. The band gap decreased up to 9 % with the increase in solution temperature from 45 °C to 75 °C. Absorption coefficients estimated by PDS signal showed the significant absorption in low photon energy region of 1.5 eV to 2.0 eV. The dark and illuminated I-V characteristics revealed that the films were highly photosensitive. The results demonstrated the potential applications of sol-gel grown CdS nanocrystalline thin films as photoconductors and optical switches.

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Synthesis and Electro-Optical Properties of Potassium Titanyl Phosphate thin Films by Sol-Gel Method

MRS Proceedings ◽

10.1557/proc-495-257 ◽

1997 ◽

Vol 495 ◽

Cited By ~ 1

Author(s):

Jianping Zhang ◽

Burtrand I. Lee ◽

Feiling Wang ◽

Melvin A. Leitheiser

Keyword(s):

Thin Films ◽

Refractive Index ◽

Optical Properties ◽

Sol Gel ◽

Structural Evolution ◽

Optical Devices ◽

Potassium Titanyl Phosphate ◽

Sol Gel Process ◽

Potential Applications ◽

Ft Ir

ABSTRACTPotassium titanyl phosphate, KTiOPO4 (KTP), thin films were prepared by sol-gel process. The structural evolution of KTP thin films was investigated by means of DTA/TGA, XRD, and FT-IR. The electro-optical results show that KTP thin films have a refractive index of 1.8 and large quadratic electro-optical coefficient of R=2.50643*10−16 and have potential applications for electro-optical devices.

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Cu2ZnSnS4 (CZTS) thin films prepared by sol–gel spin-coating technique

International Journal of Modern Physics B ◽

10.1142/s0217979220400196 ◽

2019 ◽

Vol 34 (01n03) ◽

pp. 2040019 ◽

Cited By ~ 1

Author(s):

Chao Xiong ◽

Min Gao ◽

Wei Gao

Keyword(s):

Thin Films ◽

Spin Coating ◽

Sol Gel ◽

Processing Parameters ◽

Spin Coating Technique ◽

Elemental Distribution ◽

Coating Technique ◽

Photoelectric Properties ◽

Potential Applications ◽

Czts Thin Films

The [Formula: see text] (CZTS) thin film is a photovoltaics material with excellent photoelectric properties and has good potential applications. The CZTS thin films with different spin-coated layers and sulfurized temperatures were successfully prepared by a sol–gel spin-coating technique. The relationships of microstructure, surface morphology and processing parameters were studied using XRD, SEM and EDS. The results indicate that the grain size of the sample sulfurized at [Formula: see text]C was larger than that of the sample sulfurized at [Formula: see text]C. With increasing layers of spin, coatings, the films showed better crystalline structure. The sulfureted CZTS thin films prepared by six spin-coating possess uniform elemental distribution.

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Highly transparent porous ZrO2 thin films: fabrication and optical properties

RSC Advances ◽

10.1039/c5ra01772f ◽

2015 ◽

Vol 5 (45) ◽

pp. 35929-35933 ◽

Cited By ~ 4

Author(s):

Yu Chen ◽

Aolin Li ◽

Yige Li ◽

Junfei Li ◽

Guozhang Dai ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

High Temperature ◽

Sol Gel ◽

Dip Coating ◽

Infrared Light ◽

Insulating Layer ◽

Coating Method ◽

Potential Applications ◽

Dip Coating Method

Porous ZrO2 thin films that are highly transparent to visible and infrared light were fabricated via a simple sol–gel dip-coating method, and have promising potential applications in solar cells as a high-temperature-resistant insulating layer.

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Magnesium Zirconate Titanate Thin Films Used as an NO2 Sensing Layer for Gas Sensor Applications Developed Using a Sol–Gel Method

Sensors ◽

10.3390/s21082825 ◽

2021 ◽

Vol 21 (8) ◽

pp. 2825

Author(s):

Pei-Shan Huang ◽

Ke-Jing Lee ◽

Yeong-Her Wang

Keyword(s):

Thin Films ◽

Gas Sensor ◽

Sol Gel ◽

Sensor Applications ◽

Zirconate Titanate ◽

Coating Method ◽

Potential Applications ◽

Gas Molecules ◽

P Type ◽

High Repeatability

Magnesium zirconate titanate (MZT) thin films, used as a sensing layer on Al interdigitated electrodes prepared using a sol–gel spin-coating method, are demonstrated in this study. The p-type MZT/Al/SiO2/Si structure for sensing NO2 is also discussed. The results indicated that the best sensitivity of the gas sensor occurred when it was operating at a temperature ranging from 100 to 150 °C. The detection limit of the sensor was as low as 250 ppb. The sensitivity of the MZT thin film was 8.64% and 34.22% for 0.25 ppm and 5 ppm of NO2 gas molecules at a working temperature of 150 °C, respectively. The gas sensor also exhibited high repeatability and selectivity for NO2. The response values to 250, 500, 1000, 1500, 2000, 2500, and 5000 ppb NO2 at 150 °C were 8.64, 9.52, 12, 16.63, 20.3, 23, and 34.22%, respectively. Additionally, we observed a high sensing linearity in NO2 gas molecules. These results indicate that MZT-based materials have potential applications for use as gas sensors.

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Surfactant Effect on the Synthesis of Mesoporous TiO2-SiO2 Coatings Using Sol-Gel Technology

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.762.263 ◽

2018 ◽

Vol 762 ◽

pp. 263-267

Author(s):

Margarita Karpe

Keyword(s):

Thin Films ◽

Sol Gel ◽

Mesoporous Structure ◽

Titanium Isopropoxide ◽

Water Contact ◽

Separation Membranes ◽

Mesoporous Thin Films ◽

Potential Applications ◽

Triblock Copolymer Surfactant ◽

Xrd Patterns

The aim of the research was to develop the area of mesoporous thin films of a binary TiO2–SiO2 system. Sol was synthesized from tetraethylorthosilicate as the silica source and titanium isopropoxide solution as the TiO2 source, while triblock copolymer surfactant (Pluronic F 127 (10% solution in water, (P))) was used as the mesostructure-directing agent. In this paper we present sol-gel obtained TiO2–SiO2 with a mesoporous structure. The effects of added titanium on the mesostructure and on the porosity are presented and discussed. Four different molar percentage ratios of Ti: Si were used for the synthesis of mixed TiO2–SiO2 mesoporous thin films on glass substrate. The mesoporous structure of thin films was characterized by X-ray diffraction (XRD) patterns, atomic force microscopy (AFM), scanning electron microscopy (SEM) and the water contact angle. These mesoporous TiO2–SiO2 thin films could have many potential applications in many areas such as separation membranes, catalysis, optics, and self-cleaning surfaces.

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Sol-Gel Lithium Silicate Electrolyte Thin Films

MRS Proceedings ◽

10.1557/proc-346-189 ◽

1994 ◽

Vol 346 ◽

Cited By ~ 1

Author(s):

E. Mouchon ◽

L. C. Klein ◽

V. Picard ◽

M. Greenblatt

Keyword(s):

Thin Films ◽

Sol Gel ◽

Dip Coating ◽

Visible Range ◽

Lithium Silicate ◽

Lithium Nitrate ◽

X Ray Diffraction ◽

Sol Gel Process ◽

Potential Applications ◽

Gelling Time

ABSTRACTFor more than a decade, the sol-gel process has been used to prepare lithium silicate gels that have potential applications as solid electrolytes in lithium batteries and electrochromic windows. The interest in these Li2O-SiC2 materials is their fast and stable ionic conductivity from room temperature up to 350°C. Typically these materials have been prepared with 15 mole % Li2O in bulk samples, but rarely in thin films. This work was undertaken to prepare chemically stable lithium silicate thin films with up to 30 mole % Li2O. Lithium nitrate was used as the lithium precursor. Solutions were evaluated for gelling time and homogeneity. Thin films were made by dip coating. After heat treatment at 200, 250 and 300°C, films were characterized for surface quality, thickness and microstructure using electron microscopy, x-ray diffraction analysis and profilometry. Transparency was investigated in the visible range (350–800 nm).

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The crystallization of thin-film ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100122095 ◽

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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