Sol–gel synthesis of calcium hydroxyapatite thin films on quartz substrate using dip-coating and spin-coating techniques

ABSTRACTThere is an increasing interest in sol-gel synthesis of nitrides. The ability to deposit films of these materials by dip- or spin-coating will increase the range of applications in which they are viable and is an important step toward general sol-gel processing of nitride materials.With transition metals, the ammono based analogue of the well established alkoxy route to gels is inherently difficult to control. Due to the basicity of the system, the overwhelming tendency is of the starting materials to favour particle growth which results in a precipitate rather than a stable emulsion, unless both environment and synthetic pathway are carefully controlled. Hence reports to date of sol-gel routes to nitrides describe production of powders. We report work on a sol-gel route to titanium nitride with the ammonolysis of titanium amides controlled by temperature and chemical moderators, resulting in stable emulsions useful for dip-coating.

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Sol-gel synthesis and characterization of Ag nanoparticles in ZrO2 thin films

Journal of Materials Research ◽

10.1557/jmr.2009.0314 ◽

2009 ◽

Vol 24 (8) ◽

pp. 2541-2546 ◽

Cited By ~ 7

Author(s):

Eisuke Yokoyama ◽

Hironobu Sakata ◽

Moriaki Wakaki

Keyword(s):

Thin Films ◽

Sol Gel ◽

Composite Films ◽

Dip Coating ◽

Molar Ratio ◽

X Ray Diffraction ◽

Silver Surface ◽

Molar Ratios ◽

Sol Gel Synthesis

ZrO2 thin films containing silver nanoparticles were prepared using the sol-gel method with Ag to Zr molar ratios [Ag]/[Zr] = 0.11, 0.25, 0.43, 0.67, 1.00, 1.50, and 2.33. After dip coating on glass substrate, coated films were annealed at 200 and 300 °C in air. X-ray diffraction peaks corresponding to crystalline Ag were observed, but a specific peak corresponding to ZrO2 was not observed. At the molar ratio [Ag]/[Zr] = 0.25, the particle size of Ag distributed broadly centered at 17 nm for an annealing temperature of 200 °C and at 25 nm for 300 °C. The films annealed in air at 200 °C showed an absorption band centered at 450 nm because of the silver surface plasmon resonance, whereas films heated at 300 °C in air caused a red shift of the absorption to 500 nm. The absorption peak was analyzed using the effective dielectric function of Ag-ZrO2 composite films modeled with the Maxwell-Garnett expression.

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Sol-Gel Synthesis and Characterization of Ba1-xGdxTiO3+δ Thin Films on SiO2/Si Substrates Using Spin-Coating Technique

Materials Science ◽

10.5755/j01.ms.23.1.13954 ◽

2017 ◽

Vol 23 (1) ◽

Author(s):

Yen Chin TEH ◽

Ala’eddin A. SAIF ◽

Prabakaran POOPALAN

Keyword(s):

Thin Films ◽

Spin Coating ◽

Sol Gel ◽

Spin Coating Technique ◽

Synthesis And Characterization ◽

Coating Technique ◽

Si Substrates ◽

Sol Gel Synthesis

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Sol–Gel Synthesis and Characterization of Coatings of Mg-Al Layered Double Hydroxides

Materials ◽

10.3390/ma12223738 ◽

2019 ◽

Vol 12 (22) ◽

pp. 3738 ◽

Cited By ~ 3

Author(s):

A. Smalenskaite ◽

M. M. Kaba ◽

I. Grigoraviciute-Puroniene ◽

L. Mikoliunaite ◽

A. Zarkov ◽

...

Keyword(s):

Thin Films ◽

Layered Double Hydroxides ◽

Sol Gel ◽

Xrd Analysis ◽

Dip Coating ◽

Dipping Process ◽

Synthetic Approaches ◽

Sol Gel Synthesis ◽

Double Hydroxides ◽

Steel Substrates

In this study, new synthetic approaches for the preparation of thin films of Mg-Al layered double hydroxides (LDHs) have been developed. The LDHs were fabricated by reconstruction of mixed-metal oxides (MMOs) in deionized water. The MMOs were obtained by calcination of the precursor gels. Thin films of sol–gel-derived Mg-Al LDHs were deposited on silicon and stainless-steel substrates using the dip-coating technique by a single dipping process, and the deposited film was dried before the new layer was added. Each layer in the preparation of the Mg-Al LDH multilayers was separately annealed at 70 °C or 300 °C in air. Fabricated Mg-Al LDH coatings were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and atomic force microscopy (AFM). It was discovered that the diffraction lines of Mg3Al LDH thin films are sharper and more intensive in the sample obtained on the silicon substrate, confirming a higher crystallinity of synthesized Mg3Al LDH. However, in both cases the single-phase crystalline Mg-Al LDHs have formed. To enhance the sol–gel processing, the viscosity of the precursor gel was increased by adding polyvinyl alcohol (PVA) solution. The LDH coatings could be used to protect different substrates from corrosion, as catalyst supports, and as drug-delivery systems in medicine.

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Sol-Gel Derived Two-Dimensional Nanostructures of Calcium Phosphates

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.91.13 ◽

2014 ◽

Vol 91 ◽

pp. 13-18 ◽

Cited By ~ 4

Author(s):

A. Prichodko ◽

V. Jonauske ◽

M. Cepenko ◽

A. Beganskiene ◽

A. Kareiva

Keyword(s):

Thin Films ◽

Calcium Phosphates ◽

Steel Substrate ◽

Sol Gel ◽

Calcium Hydroxyapatite ◽

Xrd Analysis ◽

Dip Coating ◽

Force Microscopy ◽

Angle Measurements ◽

Main Components

Calcium hydroxyapatite (Ca10(PO4)6(OH)2, CHAp), tricalcium phosphate (Ca3(PO4)2, TCP) and calcium oxide (CaO) are the main components of inorganic part of human bones. Such synthetic nanocomposites could be very important implantable materials and using as substitute material for human hard tissues (bones and teeth). In this study, an aqueous sol-gel chemistry route has been developed to prepare nanostructured CHAp thin films on stainless steel substrate. For the preparation of thin films dip-coating and spin-coating techniques were used. The final samples were obtained by calcination of coatings for different time at 1000 °C. For the characterization of surface properties, the X-ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM), atomic force microscopy (AFM) and the contact angle measurements were recorded.

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Comparative studies of sol-gel SiO 2 thin films prepared by spin-coating and dip-coating techniques

10.1117/12.782962 ◽

2007 ◽

Cited By ~ 2

Author(s):

Xiliang He ◽

Jiehua Wu ◽

Xiangdong Gao ◽

Lingnan Wu ◽

Xiaomin Li

Keyword(s):

Thin Films ◽

Spin Coating ◽

Comparative Studies ◽

Sol Gel ◽

Dip Coating

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Sol–Gel Synthesis of Nickel-Doped Cr2O3 Thin Films

Journal of Molecular and Engineering Materials ◽

10.1142/s2251237317500125 ◽

2017 ◽

Vol 05 (04) ◽

pp. 1750012 ◽

Cited By ~ 1

Author(s):

Ahlam Zekaik ◽

Hadj Benhebal ◽

Bedhiaf Benrabah ◽

Aziza Chibout ◽

Nacera Tayebi ◽

...

Keyword(s):

Thin Films ◽

Sol Gel ◽

Dip Coating ◽

X Ray Diffraction ◽

Glass Substrates ◽

Coating Method ◽

Parallel Circuit ◽

Dip Coating Method ◽

Sol Gel Synthesis ◽

Synthesized Materials

This work presents an experimental study dedicated to the synthesis and characterization of pure and Ni-doped chromium (III) oxide thin films. Sol–gel thin films with doping rates of 3%, 6%, 9%, and 12% were deposited onto glass substrates by the dip-coating method at room temperature using Cr(NO3)3: 9H2O as precursor. Using X-ray diffraction (XRD), infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–Vis), and impedance spectroscopy on solids, we noted that the films are polycrystalline with a grain size ranging from 11.2[Formula: see text]nm to 24.4[Formula: see text]nm, the synthesized materials are highly transparent in the visible light with more than 90% of transmittance and have an optical bandgap less than 3.0[Formula: see text]eV overall, and the equivalent circuit of the deposited films is a resistors and capacitors (RC) parallel circuit.

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Sol–gel synthesis of calcium phosphate-based coatings – A review

Chemija ◽

10.6001/chemija.v31i1.4169 ◽

2020 ◽

Vol 31 (1) ◽

Author(s):

Kunio Ishikawa ◽

Aivaras Kareiva

Keyword(s):

Thin Films ◽

Calcium Phosphate ◽

State Of The Art ◽

Sol Gel ◽

Calcium Hydroxyapatite ◽

Biological Properties ◽

Review Article ◽

Metallic Implants ◽

Phosphate Coatings ◽

Sol Gel Synthesis

Calcium phosphate (CP)-based biomaterials, especially nanostructured ones, show a high biocompatibility and increased biological properties. The coatings composed of stoichiometric hydroxyapatite have been extensively used to improve integration of metallic implants in the host bone. However, these coatings exhibited several drawbacks that limited their successful application. It was concluded in numerous articles that the sol–gel derived coatings can undergo cracking and delamination and are scarcely uniform. In this review article the recent advances on the sol–gel synthesis of different phosphate coatings and thin films are summarized. The attention is paid to coatings and thin films of calcium hydroxyapatite (CHAp), other phosphates, bioglasses and different composite materials. The state of the art, limitations, potentialities, open challenges, and the future scenarios for the application of CP bioceramics are highlighted in this study.

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EPITAXIAL GROWTH OF SrTiO3 THIN FILMS BY SOL-GEL SYNTHESIS ON LaAlO3 AND Ni SUBSTRATES

International Journal of Modern Physics B ◽

10.1142/s0217979205028608 ◽

2005 ◽

Vol 19 (01n03) ◽

pp. 379-381 ◽

Cited By ~ 1

Author(s):

S. CHEN ◽

Z. HAN ◽

Q. LIU ◽

S. S. WANG ◽

Z. Y. SUN ◽

...

Keyword(s):

Thin Films ◽

Spin Coating ◽

Sol Gel ◽

Solution Process ◽

Cube Texture ◽

Buffer Layers ◽

Uniform Microstructure ◽

Metal Organic ◽

Sol Gel Synthesis ◽

Organic Decomposition

A solution process was used to grow SrTiO 3 ( STO ) buffer layers on LaAlO 3 ( LAO ) and biaxially textured Ni substrates by spin coating technique. The epitaxial STO film obtained has strong cube texture and uniform microstructure. A metal organic decomposition process using trifluoroacetate precursors was applied to deposit YBa 2 Cu 3 O 7-δ ( YBCO ) thin films on these buffer layers. The YBCO / STO / LAO was biaxially textured and the T Conset and Δ T C is 90.1K and 2.7K, respectively.

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Formation of ZnO Nanoparticulate Thin Film: Sol-Gel Synthesis and Characterisation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.832.362 ◽

2013 ◽

Vol 832 ◽

pp. 362-367

Author(s):

Mohd Firdaus Malek ◽

Mohamad Hafiz Mamat ◽

Musa Mohamed Zaihidi ◽

Mohd Zainizan Sahdan ◽

Zuraida Khusaimi ◽

...

Keyword(s):

Thin Films ◽

Sol Gel ◽

Visible Region ◽

Zinc Content ◽

Dip Coating ◽

Film Deposition ◽

Zno Films ◽

Coating Method ◽

Dip Coating Method ◽

Sol Gel Synthesis

ZnO thin films have been prepared sol gel dip coating method using zinc acetate dehydrate (Zn(CH3COO)2·2H2O, Merck) as cation source, 2-methoxyethanol (C3H8O2, Merck) as solvent and monoethanolamine, MEA (C2H7NO, R&M) as sol stabilizer. Film deposition was performed by dip-coating technique at a fixed deposition rate on Corning 7740 glass substrate. The effect of sol concentration on the properties of the thin films is discussed. The effect of the sol concentration on produced ZnO films was found to be significant. X-ray analysis showed that thin films were preferentially orientated along the c-axis direction of the crystal. Besides, the films had a transparency of greater than 80% in the visible region for sol–gels with a zinc content of up to 0.8 M and exhibited absorption edges at ~375 nm.

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