scholarly journals Excellent Photocatalytic Degradation of Indigo Dye using Low Cost Chemical Route Grown Highly Luminescent SnO2 Decorated Polystyrene Nanocomposites

2021 ◽  
Author(s):  
Jyoti Bala Kaundal ◽  
R.K Tiwari ◽  
Y C Goswami
Keyword(s):  
Polymer Nanocomposites ◽  
Tin Oxide ◽  
Low Cost ◽  
Sol Gel ◽  
Visible Region ◽  
Chemical Route ◽  
Glass Substrates ◽  
Afm Micrographs ◽  
Polystyrene Waste ◽  
Vertical Chain

Abstract Irrational use of dye is a challenge for our environment specifically for clean water. Highly luminescent SnO2 decorated Polystyrene nanocomposites developed as an effective solution for it. The low cost chemical synthesis of highly luminescent tin oxide decorated Polystyrene (SnO2-PS) polymer nanocomposites using recyclable expended polystyrene waste has been reported. Sol gel grown tin oxide nanoparticles, thoroughly dissolved in dissolved in toluene were used with recyclable expended polystyrene waste. The composites were grown either on glass substrates or developed as flexible self sustaining layers and characterized by optical, structural & morphological characterizations. X ray diffractograms of SnO2-PS polymer nanocomposites exhibit crystalline behavior with tetragonal structure of SnO2. Accumulation of SnO2 particles on the surface with increasing concentration, in the form of spherical structures is observed in AFM micrographs. Hollow vertical chain like growth is also observed. Absorption edge shift towards higher wavelength results in decrease in band gap with increasing concentration. The Photoluminescence (PL) spectra for higher SnO2 shows a significant peak peaks in visible spectra at about 425 nm. SnO2 decorated Polystyrene nanocomposites synthesized using recyclable expended polystyrene waste opens a new scope in flexible optoelectronic applications with visible region photoluminescence.

Microstructural and Electrical Conductivity of Annealed ZnO Thin Films

2014 ◽  
Vol 970 ◽  
pp. 120-123 ◽  
Author(s):  
Peh Ly Tat ◽  
Karim bin Deraman ◽  
Wan Nurulhuda Wan Shamsuri ◽  
Rosli Hussin ◽  
Zuhairi Ibrahim
Keyword(s):  
Thin Films ◽  
Low Cost ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Dip Coating ◽  
Zno Thin Films ◽  
Zno Films ◽  
Axis Orientation ◽  
Glass Substrates ◽  
Afm Micrographs

Undoped nanocrystalline ZnO thin films were deposited onto the glass substrates via the low cost sol-gel dip coating method. The as-grown ZnO films were annealed at the temperatures ranging from 400 °C to 550 °C. The X-ray diffraction (XRD) pattern revealed that the annealed ZnO films were polycrystalline with hexagonal wurtzite structure and majority preferentially grow along (002) c-axis orientation. Atomic force microscopy (AFM) micrographs showed the improvement of RMS roughness and grain size as annealing temperature increased. The ZnO films that annealed at 500 oC exhibited the lowest resistivity value.

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.

Structural and Optical Properties of InSnO3 Sol-Gel Coatings to Use in Windows Glass Buildings

2010 ◽  
Vol 168-170 ◽  
pp. 2348-2351
Author(s):  
Lazaro De Jesus Dominguez Gallegos ◽  
Angélica Silvestre López Rodríguez ◽  
Pio Sifuentes Gallardo ◽  
Miguel Angel Hernández Rivera ◽  
María Guadalupe Garnica Romo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Indium Tin Oxide ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Indium Chloride ◽  
Glass Substrates ◽  
Tin Chloride ◽  
Ito Thin Films ◽  
Ito Films

Indium stannate (InSnO3) films doping with small amounts of copper are made highly useful as architectural window coatings. Indium-tin-oxide (ITO) has attracted intense interest due to some of its unique characteristics; it has high optical transmittance in the visible region, low electric resistivity, and chemical stability. Therefore, ITO thin films have been found to play an important role in opto-electronic applications. In this work, uniform and transparent ITO films were deposited onto glass substrates using a sol-gel process. The initial sols were prepared by mixing solutions of indium chloride prepared in anhydrous ethanol with tin chloride and mechanically stirring and refluxed 2 hours and aged 2 week, the resultant mixture until a clear and sticky coating sol was obtained. The glass substrates were spin-coated and annealed at 500 °C. Because annealing conditions affect the microstructures, the properties of the resultant ITO films can be controlled. The optical transmittance of 200 nm thick ITO film was more than 80% in the visible region. The surface morphology examined by SEM appears to be uniform over large surface areas. The structural, microstructural and optical properties of the coatings and powders made from the sols were extensively characterized by using XRD, AFM and spectrophotometer techniques

scholarly journals Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications

2020 ◽  
Vol 18 (1) ◽  
pp. 284
Author(s):  
N. Parimon ◽  
M. H. Mamat ◽  
A. S. Ismail ◽  
I. B. Shameem Banu ◽  
M. K. Ahmad ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Visible Region ◽  
Annealed Film ◽  
Band Gap Energy ◽  
Humidity Sensing ◽  
Glass Substrates ◽  
Sensing Applications ◽  
Vis Spectroscopy

Nickel oxide (NiO) nanosheet films were successfully grown onto NiO seed-coated glass substrates at different annealing temperatures for humidity sensing applications. NiO seed layers and NiO nanosheet films were prepared using a sol-gel spin coating and sonicated sol-gel immersion techniques, respectively. The properties of NiO nanosheet films at as-deposited, 300 ℃, and 500 ℃-annealed were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy, and humidity sensor measurement system. The XRD patterns demonstrate that the grown NiO films have crystalline cubic structures at temperature of 300 ℃ and 500 ℃. The FESEM images show that the large porous nanosheet network spread over the layers as the annealing temperature increased. The UV-vis spectra revealed that all the nanosheet films have the average transmittance below than 50% in the visible region, with absorption edges ~ 350 nm. The optical band gap energy was evaluated in ranges of 3.39 to 3.61 eV. From the obtained humidity sensing results, it shows that 500 ℃-annealed film exhibited the best sensitivity of 257, as well as the slowest response time, and the fastest recovery time compared with others.

scholarly journals Studies on Structural, optical and Magnetic properties of Yttrium Aluminum Bromate (YAB) Nanomaterials, prepared at high annealing temperature

2021 ◽  
Vol 2070 (1) ◽  
pp. 012067
Author(s):  
Bibhuti Bikramaditya ◽  
Rakesh Kumar Singh ◽  
Nishant Kumar ◽  
Pushpendra Kumar Verma
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Annealing Temperature ◽  
Light Emission ◽  
Low Cost ◽  
Sol Gel ◽  
Visible Region ◽  
Photoluminescence Property ◽  
Photo Luminescence ◽  
Yttrium Aluminum

Abstract In this research, we present structural, photo-luminescence and magnetic properties of the Yttrium Aluminum Borate (YAB) nanomaterial, synthesized by low-cost Sol-gel method in high temperature range. X-ray diffraction (XRD) analysis, shows that crystal structure of YAB is of nanometric size ranging between 38 nm to 47 nm for the annealing temperature above 900°C. Photoluminescence property shows that YAB gives intense Blue light emission in the visible region. High-temperature annealing was found to increase the grain size and enhance the blue luminescence. Vibrating Sample Magnetometer (VSM) shows that coercivity increases while Magnetization and retentivity decreases for YAB nanomaterials for the temperature above 900 degree Celsius. Prepared YAB materials may be useful for LED or related devices.

Sol-gel synthesis of biocompatible silica-chitosan hybrids and hydrophobic coatings

2008 ◽  
Vol 23 (8) ◽  
pp. 2053-2060 ◽  
Author(s):  
S. Smitha ◽  
P. Shajesh ◽  
P. Mukundan ◽  
K.G.K. Warrier
Keyword(s):  
Condensation Reaction ◽  
Sol Gel ◽  
Visible Region ◽  
Reaction Medium ◽  
Optical Transmittance ◽  
Hydrophobic Coatings ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Sol Gel Synthesis

A new organic–inorganic hybrid synthesized through a sol-gel process starting from alkoxysilane and chitosan is reported. Functionalization of the hybrid was effected through in situ hydrolysis–condensation reaction of methyltrimethoxysilane (MTMS) and vinyltrimethoxysilane (VTMS) in the reaction medium. The process yields highly transparent and hydrophobic silica–chitosan hybrids. The hybrid gel was investigated with respect to chemical modification, thermal degradation, hydrophobicity, and transparency under the ultraviolet-visible region. The extent of hydrophobicity had been tailored by varying the precursor ratio. SiO2–chitosan–MTMS hybrids showed a higher thermal stability than SiO2–chitosan–VTMS (SCV) hybrids with respect to hydrophobicity. Condensation of silsesquioxanes generated from the hydrolysis of MTMS and VTMS over the silica-chitosan particles impart hydrophobicity to the hybrid. The coatings of functionalized SiO2–chitosan precursor sol on glass substrates showed nearly 100% optical transmittance in the visible region. The present hybrid material may find application in optics and other industries.

scholarly journals Solution-Based Deposition of Transparent Eu-Doped Titanium Oxide Thin Films for Potential Security Labeling and UV Screening

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1132 ◽  
Author(s):  
Anara Molkenova ◽  
Laura Khamkhash ◽  
Ainur Zhussupbekova ◽  
Kuanysh Zhussupbekov ◽  
Sagyntay Sarsenov ◽  
...  
Keyword(s):  
Thin Films ◽  
Titanium Oxide ◽  
Low Cost ◽  
Visible Region ◽  
Photovoltaic Devices ◽  
Oxide Thin Films ◽  
Glass Substrates ◽  
Relaxation Transitions ◽  
Red Luminescence ◽  
Metal Doped

Transparent titanium oxide thin films attract enormous attention from the scientific community because of their prominent properties, such as low-cost, chemical stability, and optical transparency in the visible region. In this study, we developed an easy and scalable solution-based process for the deposition of transparent TiOx thin films on glass substrates. We showed that the proposed method is also suitable for the fabrication of metal-doped TiOx thin films. As proof-of-the-concept, europium Eu(III) ions were introduced into TiOx film. A photoluminescence (PL) study revealed that Eu-doped TiOx thin films showed strong red luminescence associated with 5D0→7Fj relaxation transitions in Eu (III). We found that prepared TiOx thin films significantly reduce the transmittance of destructive UV radiation; a feature that can be useful for the protection of photovoltaic devices. In addition, transparent and luminescent TiOx thin films can be utilized for potential security labeling.

Preparation and Photocatalytic Properties of Terrace Composite SnO2/TiO2:Cu2+ Film

2016 ◽  
Vol 852 ◽  
pp. 1112-1117 ◽  
Author(s):  
Guo Dong Wang ◽  
Chang Ping Wei ◽  
Rui Ying He ◽  
Jing San ◽  
Chun Jia Peng
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Visible Region ◽  
Average Diameter ◽  
Degradation Efficiency ◽  
Doping Amount ◽  
Glass Substrates ◽  
Coating Method ◽  
Composite Form ◽  
20 Nm

nanoSnO2 and Cu-doped TiO2 gelatins were prepared by sol-gel method, coated onto glass substrates by spin coating method, followed by drying at low temperature and calcined at high temperature, the influence on the structure and properties made by doping amount and composite form was discussed about. The films were characterized by XRD, SEM , EDS and UV-Vis, the photocatalysis degradation efficiency was studied as well. The results showed that the SnO2/ TiO2:Cu2+films were anatase structure, the surface were flat and stable without obvious crack, average diameter was about 20 nm. EDS indicated that Cu was introduced to TiO2 stratum of the SnO2TiO2 films ; UV-Vis showed the absorbance at visible region increased comparing to pure TiO2 and mixed SnO2TiO2 system. The degradation experiment under UV light showed degradation efficiency of SnO2/ TiO2: Cu2+films was higher compared with the mixed structure films, When the doping amount of Cu increased to 10% (mole fraction), the photocatalysis degradation efficiency reached its maximum.

scholarly journals Incorporation of Nanohybrid Films of Silica into Recycled Polystyrene Matrix

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Genoveva Hernández-Padrón ◽  
Domingo Rangel-Miranda ◽  
Gerardo Cedillo ◽  
Alejandra Blanco-Hernández
Keyword(s):  
Sol Gel ◽  
Textural Properties ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Glass Substrates ◽  
H Nmr ◽  
Sol Gel Process ◽  
Nmr Techniques ◽  
Polystyrene Waste ◽  
Sol Gel Synthesis

An alternative for the reutilization of polystyrene waste containers consisting in creating a hybrid material made of SiO2nanoparticles embedded in a matrix of recycled polystyrene (PSR) has been developed. Recycled polystyrene functionalized (PSRF) was used to influence the morphological and antifog properties by the sol-gel synthesis of nanohybrid silica. To this end, silica nanoparticles were produced from alkoxide precursors in the presence of recycled polystyrene. The functionalization of this polymeric matrix was with the purpose of uniting in situ carboxyl and silanol groups during the sol-gel process. In this way, opaque or transparent solid substrates can be obtained, with each of these endowed with optical conditions that depend on the amount of reactants employed to prepare each nanohybrid specimen. The nanohybrids were labelled as SiO2/PSR (HPSR) and SiO2/PSRF (HPSRF) and their properties were then compared to those of commercial polystyrene (PS). All the prepared samples were used for coating glass substrates. The hydrophobicity of the resultant coatings was determined through contact angle measurement. The nanohybrid materials were characterized by FT-IR and1H-NMR techniques. Additionally, TGA and SEM were employed to determine their thermal and textural properties.

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