scholarly journals The Influence of Annealing Temperature on the Structural and Optical Properties of ZrO2 Thin Films and How Affects the Hydrophilicity

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 454 ◽  
Author(s):  
A. Méndez-López ◽  
O. Zelaya-Ángel ◽  
M. Toledano-Ayala ◽  
I. Torres-Pacheco ◽  
J.F. Pérez-Robles ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Average Particle Size ◽  
Dip Coating ◽  
Visible Range ◽  
Average Particle ◽  
Structural And Optical Properties ◽  
Air Atmosphere ◽  
Vis Spectroscopy

Zirconium oxide (ZrO2) thin films were prepared by the sol-gel dip coating technique, in combination with annealing at different temperatures in air atmosphere, with the final goal of studying the water wettability of the surface. The annealing effects on the structural and optical properties of the ZrO2 films were investigated to check the characteristics of the material. X-ray diffraction (XRD) patterns of ZrO2 annealed at 450 °C and 550 °C show the formation of tetragonal phase, with layers constituted by nanoparticles with average particle size of 21 nm and 25 nm, respectively. Fourier-transform infrared spectroscopy (FT-IR) spectra revealed the presence of vibrational modes associated to ZrO2. Photoluminescence (PL) and ultraviolet-visible spectroscopy (UV–Vis) spectroscopy was used for optical properties. All deposited ZrO2 thin films presented a high optical transparency, with an average transmittance above 70% in the visible range (400–700 nm). The hydrophilic properties of ZrO2 films were characterized by means of the measurements of the contact angle. When the sample was annealed at 550 °C, the hydrophilicity reached the best behavior, which was explained as an effect of the structural and morphological change of the films.

Structural and optical properties of KNN nanoparticles synthesized by a sol–gel combustion method

2017 ◽  
Vol 31 (15) ◽  
pp. 1750175 ◽  
Author(s):  
Gh. H. Khorrami ◽  
M. Mousavi ◽  
M. Dowran
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Average Particle Size ◽  
Combustion Method ◽  
Average Particle ◽  
Potassium Sodium Niobate ◽  
Structural And Optical Properties ◽  
Vis Spectroscopy ◽  
Gel Combustion ◽  
Gel Combustion Method

In this paper, potassium sodium niobate (KNN) nanopowders were successfully obtained by sol–gel combustion method. According to thermogravimetric analysis (TGA) results, the produced xerogel was calcined at 500[Formula: see text]C, 600[Formula: see text]C, and 700[Formula: see text]C to obtain KNN powders. The structural and optical properties of the prepared powders were studied using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, transmission electron microscopy (TEM), and UV–vis spectroscopy. The XRD patterns indicated formation of orthorhombic KNN samples. The Scherrer formula and size–strain plot (SSP) method were employed to calculate crystallite size and lattice strain of the KNN powders. The TEM image revealed that the average particle size of the prepared samples is about 30 nm and they have cubic shape. The optical band gap energy of the samples was calculated using UV–vis absorbance spectra of the samples along with Tauc relation.

FABRICATION AND CHARACTERIZATION OF AQUEOUS SOL–GEL-DERIVED LaFeO3 THIN FILMS

2000 ◽  
Vol 14 (22n23) ◽  
pp. 801-808 ◽  
Author(s):  
M. RAJENDRAN ◽  
M. GHANASHYAM KRISHNA ◽  
A. K. BHATTACHARYA
Keyword(s):  
Thin Films ◽  
Single Phase ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Average Particle Size ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Correlation Spectroscopy ◽  
Average Particle ◽  
X Ray

A novel all-inorganic aqueous sol–gel process has been developed to fabricate LaFeO3 thin films by dip-coating. Stable, positively charged colloidal sol particles of hydrous lanthanum ferrite with an average particle size (Z av ) of 7 nm were prepared and coated onto quartz plates under controlled conditions. The sols have been characterized using photon correlation spectroscopy (PCS) for Z av and size distribution. The redispersible gel was characterized by thermogravimetric and differential thermal analysis (TG-DTA) and also by isothermal heating followed by X-ray diffraction to identify the reaction sequence to form LaFeO 3. The sol–gel films as deposited were X-ray amorphous on heating up to 500°C, partially crystalline at 600°C, fully crystalline and single phase at 650°C and above. These films were continuous, polycrystalline, single phase, had uniform thickness in the range between 180 to 1000 nm, depending on deposition conditions, and showed about 80% optical transmittance. The optical band gap varied from 2.7 to 3.3 eV as a function of the annealing temperature. The refractive index increased with increase in annealing temperature from 1.55 at 500°C to 1.86 at 800°C.

scholarly journals Structural and optical properties of TiO2 nanoparticles and their photocatalytic behavior under visible light

2021 ◽  
Vol 23 (2) ◽  
pp. e21310965
Author(s):  
Edgar Eduardo Mosquera ◽  
Daniela Herrera-Molina ◽  
Jesús Diosa
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Average Particle Size ◽  
Bandgap Energy ◽  
Average Particle ◽  
Thermal Treatments ◽  
Structural And Optical Properties

TiO2 nanoparticles were successfully synthesized using a facile and scalable sol-gel method and their structural and optical properties studied. XRD ad FTIR was used to identify the phase, crystallite size, and functional groups present in the nanoparticles. The prepared samples crystallize in the anatase structure with highly crystalline order. TEM/EDX shows that the nanoparticles are pure, spherical, and with an average particle size of 15 ± 2 nm. The bandgap energy was 3.59, 3.79, and 3.64 eV, respectively. PL emission is attributed to oxygen vacancies (Vo). The calcination temperature at 450 °C suggests a better photocatalytic performance under visible light compared with other sample's thermal treatments.

Structural and Optical Properties of Compact SnO2 Thin Films by Sol Gel Dip Coating

2014 ◽  
Vol 20 (5) ◽  
pp. 1039-1043 ◽  
Author(s):  
Sandeep Arote ◽  
Vilas Tabhane ◽  
Shashikant Gunjal ◽  
Habib Pathan
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Structural And Optical Properties ◽  
Sno2 Thin Films

STRUCTURE AND THICKNESS DEPENDENT OPTICAL PROPERTIES OF NANOCRYSTALLINE HAEMATITE THIN FILMS

2001 ◽  
Vol 15 (02) ◽  
pp. 201-208 ◽  
Author(s):  
M. RAJENDRAN ◽  
M. GHANASHYAM KRISHNA ◽  
A. K. BHATTACHARYA
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Reaction Pathway ◽  
Sol Gel ◽  
Average Particle Size ◽  
Dip Coating ◽  
Correlation Spectroscopy ◽  
Average Particle ◽  
X Ray ◽  
Thermoanalytical Techniques

An aqueous sol-gel process has been developed to deposit nanocrystalline haematite (α- Fe 2 O 3) thin films by dip-coating. Stable, positively charged colloidal sol particles of hydrous iron (III) oxide with an average particle size (Z av ) of 6 nm were prepared and coated onto quartz plates under controlled conditions. The sols were characterised using photon correlation spectroscopy (PCS) for Z av and size distribution. The re-dispersible gel was characterised by thermoanalytical techniques (TG-DTA) and also by isothermal heating followed by X-ray diffraction to identify the reaction pathway to form α- Fe 2 O 3. The films as deposited were X-ray amorphous up to 450°C, nan°Crystalline in the range 450 to 600°C, crystalline and single phase above 600°C. The films were optically transparent, continuous and had uniform thickness in the range between 180 nm to 1000 nm depending on deposition conditions. The optical band gap varied from 2.1 to 2.6 eV as a function of film thickness. The refractive index increased with increase in annealing temperature but decreased with film thickness.

Effect of Immersion Time on the Structural and Optical Properties of TiN Oxide Thin Films Obtained by Sol Gel Dip Coating Method

2019 ◽  
Vol 397 ◽  
pp. 8-12
Author(s):  
Mourad Khechba ◽  
Faouzi Hanini ◽  
Hichem Farh ◽  
Abderrahmane Bouabellou ◽  
Somia Gattal
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Optical Properties ◽  
Immersion Time ◽  
Sol Gel ◽  
Dip Coating ◽  
Structural And Optical Properties ◽  
Coating Method ◽  
Sno2 Thin Films ◽  
Dip Coating Method

In this paper, the influence of immersion time on the structural and optical properties of SnO2 thin films was investigated. A series of samples was deposited by Sol-Gel dip coating method onto glass substrates. The number of layers was fixed at 03, but the immersion time was varied between 01 to 10 minutes. The samples [(3 layers) - SnO2 / glass] were submitted to thermal treatments in air at 500°C during 2h. The specimens are characterized by Raman spectroscopy and UV-Visible spectroscopy. Raman spectroscopy show that the thin films of SnO2 obtained at 06 and 10 minutes of immersion time, are crystallizes in rutile phase. The obtained results of optical analysis showed that the SnO2 thin films are transparent (77-85%) in the visible region and the values of the optical band gap varied from 3.81eV and 3.86 eV.

Structural and optical properties of TiO2 thin films derived by sol–gel dip coating process

2007 ◽  
Vol 353 (24-25) ◽  
pp. 2469-2473 ◽  
Author(s):  
K.K. Saini ◽  
Sunil Dutta Sharma ◽  
Chanderkant ◽  
Meenakshi Kar ◽  
Davinder Singh ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Coating Process ◽  
Structural And Optical Properties ◽  
Tio2 Thin Films

Structural and optical properties of 6CaO·6SrO·7Al2O3 thin films derived by sol–gel dip coating process

2011 ◽  
Vol 357 (5) ◽  
pp. 1351-1356 ◽  
Author(s):  
P.M. Chavhan ◽  
Anubha Sharma ◽  
R.K. Sharma ◽  
Govind ◽  
CheolGi Kim ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Coating Process ◽  
Structural And Optical Properties
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