scholarly journals Sol-Gel Fabricated Transition Metal Cr3+, Co2+ Doped Lanthanum Ferric Oxide (LFO-LaFeO3) Thin Film Sensors for the Detection of Toxic, Flammable Gases: A Comparative Study

2020 ◽  
Vol 17 (Issue 1) ◽  
pp. 70-83 ◽  
Author(s):  
Prashant Bhimrao Koli ◽  
Kailas Haribhau Kapadnis ◽  
Uday Gangadhar Deshpande ◽  
Balaji pandurang More ◽  
Umesh Jagannath Tupe
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Gas Sensing ◽  
Sol Gel ◽  
Rapid Preparation ◽  
Thin Film Sensors ◽  
Enhanced Sensitivity ◽  
Lafeo3 Nanoparticles ◽  
Coating Method ◽  
Type Semiconductor

In this investigation we are reporting the rapid preparation of Perovskite LaFeO3 thin films prepared by sol-gel synthesis followed by spin coating method. The structural properties of the spin coated LaFeO3 thin films measured by X-ray Diffractometer which confirms the formation of monophasic, orthorhombic, Perovskite LaFeO3 material. The morphological features of the films were explore by the ease of scanning electron microscopy, where the crystalline LaFeO3 nanoparticles were observed. Energy dispersive spectroscopy was utilized for the determination of elemental composition. The electrical properties were carried out to confirm the typical semiconducting behaviour of LaFeO3 p- type semiconductor. The thin films were subjected for gas sensing study, the material was found to be very efficient gas sensors for LPG, petrol vapour, CO2, methanol, ethanol, acetone gases. The main object was to discuss comparative study, means, what changes in parameters may be observed due to doping elements. Here undoped LFO sensor showed excellent sensitivity to methanol vapours, while doped LFO sensors found to very sensitive for petrol vapours. The enhanced sensitivity by doped LFO may attributed to increase surface area due to dopants.While all parameter essential for effective sensor were investigated in detail like, response recovery, reusability, selectivity of both the sensors.

Hydrogen Gas Sensing Characterizations Based on Nanocrystalline SnO2 Thin Films Grown on SiO2/Si and Al2O3 Substrates

2017 ◽  
Vol 268 ◽  
pp. 244-248
Author(s):  
Abu Hassan Haslan ◽  
Imad Hussein Kadhim
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sol Gel ◽  
Hydrogen Gas ◽  
Rutile Structure ◽  
Nanoparticle Distribution ◽  
Si Substrates ◽  
Coating Method ◽  
Different Temperatures

High-quality nanocrystalline (NC) SnO2 thin films were grown on SiO2/Si and Al2O3 substrates using sol–gel spin coating method. The structural properties, surface morphologies and gas sensing properties of the NC SnO2 were investigated. XRD measurements showed a tetragonal rutile structure and the diffraction peaks for NC SnO2 thin films grown on Al2O3 substrates outperformed those of NC SnO2 films grown on SiO2/Si substrates. The surface morphology of the annealed SnO2 thin films at 500 °C appeared as polycrystalline with uniform nanoparticle distribution. Hydrogen (H2) gas sensing performance of the NC SnO2 was examined for H2 concentrations ranging from 150 ppm to 1000 ppm at different temperatures (room temperature, 75 and 125 °C) for over 50 min. The room temperature sensitivities for H2 gas sensors based on NC SnO2 thin films grown on Al2O3 and SiO2/Si substrates was 2570% and 600%, respectively upon exposure to 1000 ppm of H2 gas. While the sensitivity values at 125 °C increased to 9200% and 1950%, respectively.

Characterization and Gas Sensing Properties of Spin Coated WO3 Thin Films

2020 ◽  
Vol 234 (11-12) ◽  
pp. 1819-1834
Author(s):  
Sambhaji S. Shendage ◽  
Vithoba L. Patil ◽  
Sharadrao A. Vanalakar ◽  
Sarita P. Patil ◽  
Jalindar L. Bhosale ◽  
...  
Keyword(s):  
Thin Films ◽  
Monoclinic Phase ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Film Sensor ◽  
Glass Substrates ◽  
Thin Film Sensors ◽  
Coating Method ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

AbstractThe WO3 thin films have been synthesized on to the glass substrates by a simple and easy spin coating method at different deposition cycles and their sensor responses towards various concentrations of NO2 gas were investigated. The WO3 films were spin coated at a spinning rate of 2500–3000 rpm for 5, 10 and 15 deposition cycles, respectively. Then the films were annealed at 400 °C for 1 h in a furnace. The structural, morphological, optical and electrical properties of WO3 films were studied by different characterization techniques such as X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), FT-RAMAN Spectroscopy and electrical resistivity measurements by laboratory made two probe method respectively. It reveals a spherical grain – like morphology with a pure monoclinic phase of WO3. The FT-RAMAN spectra also confirm the pure monoclinic phase of WO3. The WO3-10 film sensor exhibits maximum gas sensitivity 21.93 and 102.4% to 5 and 100 ppm NO2 at 200 °C, respectively. The WO3-10 thin film sensors is highly sensitive and selective to NO2 over other gases.

Structure of Hydrogen Gas Sensing TiO2 Thin Films Prepared by Sol-Gel Method and their Comparison with Magnetron Sputtered Films

2013 ◽  
Vol 543 ◽  
pp. 293-296 ◽  
Author(s):  
G. Plesch ◽  
A.A. Haidry ◽  
M. Gregor ◽  
P. Durina ◽  
J. Gregus ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Gas Sensing ◽  
Sol Gel ◽  
Rutile Phase ◽  
Hydrogen Gas ◽  
Gel Method ◽  
Sensing Properties ◽  
Sol Gel Method ◽  
Coating Method

TiO2thin films with a thickness of about 150 nm were deposited by spin coating method on sapphire substrate from a sol-gel system. The hydrogen sensing properties of TiO2films annealed at various temperatures were studied and correlated with their structure, optical and electrical properties. The annealing temperatures in the range of 600 800 °C lead to anatase films with a roughness in the range of 0.6 0.9 nm. Their sensitivity towards hydrogen is low. The thin films annealed at temperatures in the range 900 1000 °C consist of rutile phase and their roughness increased to 11.7 13.5 nm. They showed good hydrogen sensitivity with optimal operating temperature 200 250 °C. The structure and sensing properties of the prepared films are compared with those synthesized with magnetron sputtering. The maximum of sensitivity was measured on the thin films with diameter of the grains about 100 nm in both cases, i.e. on thin films prepared by sol-gel method as well as on thin films prepared by magnetron sputtering. The maximum sensitivity correlates with the diameter of the grains and dont depend on the allotropy of the titanium dioxide anatase or rutile.

Comparative study of multilayered ZnO/TiO2/ZnO and TiO2/ZnO/TiO2 thin films prepared by sol–gel dip coating method

2017 ◽  
Vol 28 (23) ◽  
pp. 17499-17504 ◽  
Author(s):  
M. I. Khan ◽  
Muhammad Saleem ◽  
K. A. Bhatti ◽  
Rabia Qindeel ◽  
Hayat Saeed Althobaiti ◽  
...  
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Sol Gel ◽  
Dip Coating ◽  
Tio2 Thin Films ◽  
Coating Method ◽  
Dip Coating Method

Preparation of Nanocrystalline Titanium Dioxide (TiO2) Thin Films by the Sol-Gel Dip Coating Method

2012 ◽  
Vol 16 ◽  
pp. 105-111 ◽  
Author(s):  
Raouf Mechiakh ◽  
R. Gheriani ◽  
R. Chtourou
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Sol Gel ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Coating Method ◽  
Type Semiconductor ◽  
Nanocrystalline Titanium ◽  
Dip Coating Method ◽  
Titanium Dioxide Thin Films

Titanium dioxide thin films have been prepared by the sol–gel dip-coating method on an ITO substrate. The samples obtained were characterized by different experimental techniques: XRD, Raman, FTIR, spectroscopy of the electrochemical potential and SEM. The X-ray diffraction results showed that the TiO2 thin film obtained for a layer, after a temperature of annealing (400°C) and at the speeds of steeping between 2 and 10 cm∙s-1 was amorphous, and transformed into anatase–brookite at 0.6 cm∙s-1 for 400°C. The data of Raman spectroscopy is in good agreement with the DRX results. Observation by scanning electron microscope shows that the coating was transparent and homogeneous without any visual cracking over a wide area, and the increase in the treatment temperature did not affect the uniformity of the film. The interface of our layers to behaved like a n-type semiconductor.

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.

Study on the Grain Size of Vanadium Dioxide Thin Films using Sol-gel Spin Coating Method

2018 ◽  
Author(s):  
Ibrahim Mohd Yazid ◽  
Muhammad Hazim Raselan ◽  
Shafinaz Sobihana Shariffudin ◽  
Puteri Sarah Mohamad Saad ◽  
Sukreen Hana ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Vanadium Dioxide ◽  
Spin Coating ◽  
Sol Gel ◽  
Spin Coating Method ◽  
Coating Method ◽  
Vanadium Dioxide Thin Films

Acclimating the magnetic behavior of highly (117) oriented Bi4Ti 3-xMnxO12 thin films prepared sol-gel spin coating method

2020 ◽  
Author(s):  
A. Amali Roselin ◽  
N. Anandhan ◽  
I. Joseph Paneer Doss ◽  
G. Gopu ◽  
K. P. Ganesan ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Spin Coating Method ◽  
Coating Method
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