scholarly journals STUDY OF PREPARATION AND CHARACTERIZATION OF HYDROXYAPATITE COATINGS BY SOL-GEL TECHNIQUE

2017 ◽  
Vol 19 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Sutapa Roy Ramanan ◽  
Ramanan Venkatesh
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Dip Coating ◽  
Final Thickness ◽  
Cross Sectional ◽  
Glass Substrates ◽  
Smooth Interface ◽  
Hydroxyapatite Coatings ◽  
Coating Method ◽  
Dip Coating Method

Hydroxyapåtite (HAP) coatings were prepared on glass substrates by sol-gel dip coating method, using a isopropanol solution of calcium nitrate and 2-butanol solution of phosphorous pentoxide as starting precursors and mixing them to get a coating solution with Ca/P ratio of 1.67. The prepared coatings were dried at 150°C and subsequently  fired at 500°C to obtain dense coatings. Multilayer coatings were prepared to increase the final thickness. For some samples, SiO2, TiO2, Al2O, and Zr02 coatings modified the interface between the glass and HAP. X-ray diffraction, scanning electron microscopy, FTIR and DTA/TG were used for characterization. All the coatings obtained at 500°C in air had only crystalline hydroxyapatite phase, characteristics FTIR signature peaks of HAP and dense and smooth morphology with the apparent presence of micropores. The cross-sectional microstructure of the coatings showed presence of smooth interface.

The Structural and Surface Morphology of Annealed ZnO Films

2014 ◽  
Vol 903 ◽  
pp. 73-77
Author(s):  
Peh Ly Tat ◽  
Karim bin Deraman ◽  
Rosli Hussin ◽  
Wan Nurulhuda Wan Shamsuri ◽  
Zuhairi Ibrahim
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
Zno Films ◽  
Axis Orientation ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Coating Method ◽  
Afm Micrographs ◽  
Dip Coating Method

ZnO thin films were deposited on the glass substrates via the sol-gel dip coating method. The films were annealed at various temperatures ranging from 350 °C to 550 °C. X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the effect of annealing temperature on the structural and morphology properties of the films. The as grown films exhibited amorphous pattern while annealed films were polycrystalline structure with (002) preferential growth along c-axis orientation. The AFM micrographs revealed that the RMS roughness of the films increased as the annealing temperature increased. The grain size was ranging from 32.1 nm to 176.0 nm as the annealing temperature increased from 350 °C to 450 °C and decreased to 56.1 nm for 550 °C.

scholarly journals Characteristics and optical properties of Fe3+ doped SiO2/TiO2 thin films prepared by the sol-gel dip-coating method

2013 ◽  
Vol 16 (1) ◽  
pp. 92-100
Author(s):  
Chien Mau Dang ◽  
Dam Duy Le ◽  
Tam Thi Thanh Nguyen ◽  
Dung Thi My Dang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Water Contact ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

In this study, we have successfully synthesized Fe3+ doped SiO2/TiO2 thin films on glass substrates using the sol-gel dip-coating method. After synthesizing, the samples were annealed at 5000C in the air for 1 hour. The characteristics and optical properties of Fe3+ doped SiO2/TiO2 films were then investigated by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR). An antifogging ability of the glass substrates coated with the fabricated film is investigated and explained by a water contact angle under visible-light. The analyzed results also show that the crystalline phase of TiO2 thin films comprised only the anatase TiO2, but the crystalline size decreased from 8.8 to 5.9 nm. We also observed that the absorption edge of Fe3+- doped SiO2/TiO2 thin films shifted towards longer wavelengths (i.e. red shifted) from 371.7nm to 409.2 nm when the Fe3+-doped concentration increased from 0 to 1 % mol.

Effect of the Solvent Effect of the Solvent Used During the Preparation of SnO2 Nanoparticulated Methane Sensor

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2701-2706
Author(s):  
Guillermo Carbajal-Franco ◽  
Pedro A. Ortiz-Vázquez ◽  
Alejandro Ávila-García
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Dip Coating ◽  
Electric Response ◽  
Glass Substrates ◽  
Metallic Oxides ◽  
Sol Gel Process ◽  
Coating Method ◽  
Different Temperatures ◽  
Dip Coating Method

ABSTRACTGas monitoring is a relevant activity for industrial and domestic applications due to usage of dangerous gases as methane, which has been increasingly used as domestic and industrial fuel. In this field of research, metallic oxides such as SnO2, ZnO and Fe2O3 have been widely studied, but we are far from reaching the total understanding of all the parameters that can be varied; in order to improve the gas sensing properties of the metallic oxides. In this work, we present the change of properties derived from using different solvents during the preparation of SnO2 nanoparticles via the sol-gel process. The nanoparticles suspended in two different solvents were deposited on glass substrates by the dip-coating method. The addition of Sb as a dopant was studied at two different Sb:Sn ratios of 1:99 and 1:2. SEM showed differences in the nanostructured topology of the samples and EDS analysis was performed to determine the elemental composition of the samples and the ratios of doping. XRD spectroscopy was used to determine the phase of the materials and the crystallite size. Measurements of the electric response of the coatings to methane, under controlled conditions at different temperatures, were carried out and curves of sensitivity versus temperature were obtained.

Influence of Multi-Round Annealing Process on the Optical and Electrical Properties of Sol-Gel Derived TiO2-δ Films

2012 ◽  
Vol 465 ◽  
pp. 165-171
Author(s):  
Jin Ming Liu ◽  
Xiao Ru Zhao ◽  
Li Bing Duan ◽  
Xiao Jun Bai ◽  
Ning Jin ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Dip Coating ◽  
Annealing Process ◽  
Visible Range ◽  
Tio2 Thin Films ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

Anatase TiO2- thin films on glass substrates were prepared by sol-gel dip-coating method. We designed a multi-round annealing process which was under the air pressure of 5 Pa and then 5×10-2 Pa for one hour each at 550 °C, and such process was repeated for three times. The special designed annealing process can obviously improve the conductivity of the udoped TiO2- thin films. The minimum resistivity of the undoped TiO2- thin films reached 0.8 Ω cm after being treated by the multi-round annealing process. It was demonstrated that such annealing process was an effective way to increase the defects in TiO2- thin films such as oxygen vacancies. The average transmittances of the films were approximately 60~80% in the visible range with the forbidden gaps of 3.25~3.35 eV. After the multi-round annealing process, the optical forbidden gaps of the films became narrowed slightly, which might be also related to the defects introduced during the multi-annealing process.

Sol–Gel Synthesis of Nickel-Doped Cr2O3 Thin Films

2017 ◽  
Vol 05 (04) ◽  
pp. 1750012 ◽  
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.

PREPARATION OF CdIn2Se4n-TYPE SEMICONDUCTOR USED AS THERMOELECTRIC MATERIAL BY SOL–GEL METHOD

2009 ◽  
Vol 02 (04) ◽  
pp. 199-203 ◽  
Author(s):  
AUN-ANONG RUANTHON ◽  
THAPANEE SARAKONSRI ◽  
CHANCHANA THANACHAYANONT
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
Metal Alkoxides ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Coating Method ◽  
Type Semiconductor ◽  
Dip Coating Method ◽  
Cadmium Indium

The objective of this research was to study the effect of various parameters such as temperature and pH to the formation of cadmium indium selenide ( CdIn2 Se 4 ) thin films, which were fabricated by sol–gel dip-coating method. This n-type semiconductor compound is suitable for application as thermoelectric materials. Cadmium, indium, selenium precursors were separately dissolved by solvents: ethanol, hydrochloric acid, and acetic acid to form metal alkoxides. The precursor solutions were then mixed together in N 2 atmosphere. These metal alkoxides were hydrolyzed by adding water and then polycondensed by adding ethylene glycol to become gels. These gels were adjusted to various acid-base values by adding diethylnolamine. Glass substrates were dipped into the gels to form thin films. These thin films were annealed at various temperatures in N 2 atmosphere and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and fourier transfrom infrared spectroscopy (FTIR) techniques. The results indicated that CdIn2 Se 4 compound occurred by the reaction at room temperature with pH 4 and annealed at 450°C in N 2 atmosphere.

Optical Properties of Nanostructured Sol–Gel Thin Films Doped with Fe2O3 and Their Ferromagnetic Characterization by Mössbauer Spectroscopy

2008 ◽  
Vol 8 (12) ◽  
pp. 6491-6496
Author(s):  
Jorge Garcia-Macedo ◽  
Guadalupe Valverde-Aguilar ◽  
Raúl W. Gómez ◽  
José L. Pérez-Mazariego ◽  
Vivianne Marquina
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
Optical Quality ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

Sol–gel thin films containing Fe2O3 were deposited onto glass substrates by the dip-coating method at room temperature. Fe2O3 enriched with the isotope 57Fe was embedded in two kinds of matrices: zinc oxide (ZnO) and silica (SiO2). X-ray diffraction (XRD) was used for morphology and structure determination of the nanostructures and showed that the ZnO exhibit a wurtzite form when the film is annealed at 450 °C for 20 min. SiO2 thin films at C16H33PEO20:Fe2O3 = 1:2.7 × 10−1 molar concentration exhibit a hexagonal nanophase produced by the diblock copolymer Brij58 (C16H33PEO20). Optical absorption and infrared spectroscopy techniques were used to evaluate the optical quality of the films. In order to determine if the Fe2O3 was incorporated into the matrices, room temperature Mössbauer spectra of both samples were obtained. In both cases the hematite spectrum was obtained, corroborating that the incorporation of the Fe2O3 to the matrices was done without chemical reaction whatsoever.

Synthesis of Hydroxyapatite via Sol-Gel Dip-Coating Method on Ceramic Support

2015 ◽  
Vol 1113 ◽  
pp. 599-604
Author(s):  
Norliza Ibrahim ◽  
Rafizah Zaiton ◽  
Mohd Akmal Askalani
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Xrd Analysis ◽  
Porous Ceramics ◽  
Dip Coating ◽  
Calcium Nitrate Tetrahydrate ◽  
Filling Material ◽  
Coating Method ◽  
Silica Alumina ◽  
Dip Coating Method

Hydroxyapatite (HA) has been used extensively in application of biomedical either in the form of porous ceramics, dense ceramics, powders or granules for gap filling or coatings for implants. Synthetic HA also has an excellent ion exchange properties that used as a filling material for chromatography columns. Furthermore, many researchers have reported that high removal efficiency of the heavy metals can be achieved by using synthetic HA. In this study, HA was synthesized via sol-gel method by using calcium nitrate tetrahydrate and triethyl phosphate as the precursors and 2-metoxiethanol ether as an organic solvent. Then, HA sol was deposited on silica-alumina based ceramics whose made by recycled sanitary ware waste by dip-coating method. The obtained coated substrates were then dried at 150°C and subsequently subjected to calcination up to 1000°C. Fourier Transform Infrared (FTIR) characterization for the HA powders dried at 150°C and calcined at 600°C, 800°C and 1000°C were carried out to come out with the spectral characteristic indicative of chemical bonding. High Purity of the obtained hydroxyapatite was confirmed by XRD analysis. The SEM micrographs displayed the microstructure of the HA coatings.

Room Temperature Photoluminescence of TiO2 Thin Films Doped with Tb

2001 ◽  
Vol 15 (17n19) ◽  
pp. 813-816 ◽  
Author(s):  
A. Conde-Gallardo ◽  
M. García-Rocha ◽  
I. Hernández Calderón ◽  
R. Palomino-Merino
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Sol Gel ◽  
Broad Band ◽  
Dip Coating ◽  
Tio2 Thin Films ◽  
Glass Substrates ◽  
Novel Host ◽  
Coating Method ◽  
Dip Coating Method

Results on the fabrication and characterisation of thin films of the novel host, titania ( TiO 2), for the Tb 3+ activator ion are reported. The titania films were produced by the sol-gel process at room temperature using the dip coating method and deposited on silicon and corning glass substrates. It is shown that a different surface morphology is developed for the TiO 2:Tb films deposited on different substrates. When enough amount of Tb is incorporated and, a He-Cd 325 nm photoexcitation is used as excitation line, the films show green photoluminescence (PL) signal associated with the 5 D 4→7 F j transition of the electronic structure of Tb 3+ plus an broad band due to matrix's defects. The PL emission has better characteristics for the films deposited on silicon wafers.

Nanocrystalline Thin Films TiO2 Prepared by Different Concentration of Organic Acid and their Photocatalytic Activity

2011 ◽  
Vol 233-235 ◽  
pp. 363-368
Author(s):  
Nitikarn Fangern ◽  
Sudjit Sanguanruang ◽  
Chamorn Chawengkijwanich
Keyword(s):  
Thin Films ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Coating Method ◽  
Dip Coating Method

In this work, TiO2thin films were deposited on borosilicate glass substrates by sol-gel dip coating method and calcined at 500 °C for 15 min(heating rate3°C/min). The TiO2sol was prepared by fixing concentration of titaniumtetraisopropoxide(TTIP), TritonX-100 surfactant, ethanol and conc hydrochloric acid but amounts of acetyl acetone (Acac ) were various as 4, 6 and 8 mole respectively. After calcination process, all the TiO2thin films were homogeneous and transparent. Several techniques , such as X-ray diffraction (XRD), UV-Vis spectroscopy, Environment Scanning Electron Microscope (E-SEM), atomic force microscopy (AFM) and BET surface area analysis were used to characterize the prepared TiO2thin film. Spectra of XRD showed that the crystal structure was anatase phase with the crystal sizes of 9.05 – 12.57 nm. According to BET surface area analysis, the surface area , pore volume and pore size of TiO2were in the range of 66.35-82.53 m2/gm , 0.1194-0.1301 cm3/g and 57-71 A0respectively. The photodegradation of Reactive Blue 19 by the prepared TiO2thin films showed decomposition rate of 97.58% , 95.03 % and 94.48% for the thin films prepared by using 4, 6 and 8 mole AcAc respectively.

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