scholarly journals Review on Sol-Gel Synthesis of Perovskite and Oxide Nanomaterials

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 275
Author(s):  
Daniel Navas ◽  
Sandra Fuentes ◽  
Alejandro Castro-Alvarez ◽  
Emigdio Chavez-Angel
Keyword(s):  
Time Pressure ◽  
Low Cost ◽  
Sol Gel ◽  
Reaction Times ◽  
Vanadium Oxides ◽  
Molecular Structures ◽  
Working Temperature ◽  
Wide Range ◽  
Sol Gel Synthesis ◽  
Wide Family

Sol-Gel is a low cost, well-established and flexible synthetic route to produce a wide range of micro- and nanostructures. Small variations in pH, temperature, precursors, time, pressure, atmosphere, among others, can lead to a wide family of compounds that share the same molecular structures. In this work, we present a general review of the synthesis of LaMnO3, SrTiO3, BaTiO3 perovskites and zinc vanadium oxides nanostructures based on Sol-Gel method. We discuss how small changes in the parameters of the synthesis can modify the morphology, shape, size, homogeneity, aggregation, among others, of the products. We also discuss the different precursors, solvents, working temperature, reaction times used throughout the synthesis. In the last section, we present novel uses of Sol-Gel with organic materials with emphasis on carbon-based compounds. All with a perspective to improve the method for future applications in different technological fields.

Synthesis of Photosensitive Organic-Inorganic Hybrid Polymers via Anhydrous Sol-Gel Process for Integrated Optics

2003 ◽  
Vol 780 ◽  
Author(s):  
Xinshi Luo ◽  
Congji Zha ◽  
Barry Luther-Davies
Keyword(s):  
Low Cost ◽  
Sol Gel ◽  
Optical Loss ◽  
Hybrid Polymer ◽  
Optical Losses ◽  
Hybrid Polymers ◽  
Inorganic Hybrid ◽  
Wide Range ◽  
Integrated Optical ◽  
Sol Gel Process

AbstractPhotosensitive organic-inorganic hybrid polymers were synthesised for integrated optical and optoelectronic devices by a non-hydrous sol-gel process of hydrolysis/condensation of 3-methacryloxypropyltrimethoxysilane (MPS), diphenyldimethoxysilane (DPhDMS), and zirconium isopropoxide (TPZ) with boric acid under anhydrous conditions. The methacryl groups of MPS are UVpolymerizable, which are suitable for low cost fabrication of waveguides with a “UV write/develop” process. The incorporation of DPhDMS and TPZ was found useful in reducing the optical loss and in enhancing the thermostability of the polymer. The refractive index of the hybrid polymer is tuneable from 1.4950 to 1.5360 by variation of the ratio among MPS, DPhDMS and TPZ. Optical characterisation showed that the material has low optical losses at the telecommunications windows (0.16 dB/cm at 1310 nm and 0.4 dB/cm at 1550nm). The hybrid polymer also showed a low birefringence (1.2×10-4), a large thermo-optic (TO) coefficient (-2.77 ×10-4), and an outstanding linearity of dn/dT in a wide range of temperature (from 25 °C to 200 °C). Waveguides forming ability for the hybrid polymer with UV imprinting was also demonstrated.

The effects of surfactant in the sol–gel synthesis of CuO/TiO2 nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

2020 ◽  
Vol 44 (5) ◽  
pp. 1888-1904 ◽  
Author(s):  
T. N. Ravishankar ◽  
M. de O. Vaz ◽  
S. R. Teixeira
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Low Cost ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Activities ◽  
Uv Visible ◽  
Sol Gel Synthesis ◽  
Surfactant Assisted

Effective and low-cost CuO/TiO2 nanocomposites were prepared at room temperature by a surfactant-assisted sol–gel method for photocatalytic activities under UV-visible and visible light irradiations.

Influences of Stirring Speed and Post Annealing Temperature on the Properties of Zinc Oxide Colloid Prepared by Sol-Gel Spin Coating Method

2016 ◽  
Vol 701 ◽  
pp. 159-163 ◽  
Author(s):  
Sheen Jeff Teh ◽  
Yew Keong Sin ◽  
Kah Yoong Chan ◽  
Nisha Kumari Devaraj
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Spin Coating ◽  
Annealing Temperature ◽  
Low Cost ◽  
Sol Gel ◽  
Structural And Optical Properties ◽  
Post Annealing ◽  
Wide Range ◽  
Post Annealing Temperature

Zinc oxide (ZnO) colloid has drawn significant attention recently due to its wide range of potential applications such as photonic crystals, solar cells, sensors, and other optical devices. In this work, low cost sol-gel spin coating technique was employed to synthesis ZnO colloid. The influences of stirring speed and post annealing temperature on the properties of ZnO colloid was investigated. The structural and optical properties of ZnO colloid was characterized using field-emission scanning electron microscopy (FESEM) and ultraviolet-visible (UV-Vis) spectrophotometer, respectively. Subsequently, Tauc method was used to estimate the optical band gap of the ZnO colloid based on the optical transmittance data. The effects of the stirring speed and post annealing temperature on the structural and optical properties of ZnO colloid are revealed and discussed in this paper. It was found that ZnO colloid prepared by the stirring speed of 500rpm and 400°C post annealing temperature demonstrates the best dispersity quality of colloid system.

Sol–gel synthesis of monolithic materials with hierarchical porosity

2016 ◽  
Vol 45 (12) ◽  
pp. 3377-3399 ◽  
Author(s):  
A. Feinle ◽  
M. S. Elsaesser ◽  
N. Hüsing
Keyword(s):  
Porous Materials ◽  
Sol Gel ◽  
Length Scales ◽  
Hierarchical Porosity ◽  
High Interest ◽  
Wide Range ◽  
Synthetic Routes ◽  
Sol Gel Synthesis

The development of synthetic routes to porous materials containing multiple, discrete sets of pores having disparate length scales is of high interest for a wide range of applications.

Low-Cost Preparation of SBA-15 Silica Molecular Sieve and High Humidity Sensing Property in a Wide Range of Relative Humidity

2016 ◽  
Vol 852 ◽  
pp. 1455-1462
Author(s):  
Jie Zhang ◽  
Yong Heng Zhu ◽  
Shi Zao Kang ◽  
Xiang Qing Li ◽  
Jia Qiang Xu
Keyword(s):  
Relative Humidity ◽  
Molecular Sieves ◽  
Low Cost ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nitrogen Adsorption ◽  
Fast Response ◽  
Humidity Sensing ◽  
Wide Range

In this paper, different SBA-15 molecular sieves were prepared in a facile sol-gel method by using a low-cost sodium silicate as silicon source at different ripening temperature. The materials were characterized by small-angle XRD, TEM, nitrogen adsorption–desorption test. The results showed that ripening temperature can affect the pore size and mesostructure of SBA-15. High surface area SBA-15 can be obtained at low ripening temperature, and plugged mesostructure can be prepared at high temperature. The gravimetric humidity sensing property of the materials were tested based on a transducer of quartz crystal microbalance. The test results revealed that all the samples showed high response in the wide range of relative humidity. The sensors based on that prepared at 35°C show a good stability and linearity in the range of 11.3%RH to 98%RRH along with fast response (12s) and recovery time (8s), ultrahigh sensitivity and low hysteresis, implying that has a great potential for humidity detection.

scholarly journals Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1345 ◽  
Author(s):  
José Eduardo Casillas ◽  
Jorge Campa-Molina ◽  
Francisco Tzompantzi ◽  
Gregorio Guadalupe Carbajal Arízaga ◽  
Alejandro López-Gaona ◽  
...  
Keyword(s):  
Band Gap ◽  
Uv Light ◽  
Light Exposure ◽  
Sol Gel ◽  
Reaction Times ◽  
Binary Oxide ◽  
Semiconductor Materials ◽  
Electron Hole ◽  
Binary Oxides ◽  
Sol Gel Synthesis

This paper reports the sol-gel synthesis of Al2O3-Nd2O3 (Al-Nd-x; x = 5%, 10%, 15% and 25% of Nd2O3) binary oxides and the photodegradation of diclofenac activated by UV light. Al-Nd-based catalysts were analyzed by N2 physisorption, XRD, TEM, SEM, UV-Vis and PL spectroscopies. The inclusion of Nd2O3 in the aluminum oxide matrix in the 10–25% range reduced the band gap energies from 3.35 eV for the γ-Al2O3 to values as low as 3.13–3.20 eV, which are typical of semiconductor materials absorbing in the UV region. γ-Al2O3 and Al-Nd-x binary oxides reached more than 92.0% of photoconverted diclofenac after 40 min of reaction. However, the photocatalytic activity in the diclofenac degradation using Al-Nd-x with Nd2O3 contents in the range 10–25% was improved with respect to that of γ-Al2O3 at short reaction times. The diclofenac photoconversion using γ-Al2O3 was 63.0% at 10 min of UV light exposure, whereas Al-Nd-15 binary oxide reached 82.0% at this reaction time. The rate constants determined from the kinetic experiments revealed that the highest activities in the aqueous medium were reached with the catalysts with 15% and 25% of Nd2O3, and these compounds presented the lowest band gap energies. The experimental results also demonstrated that Nd2O3 acts as a separator of charges favoring the decrease in the recombination rate of electron-hole pairs.

scholarly journals Citric Acid-Assisted Inexpensive Semi-Wet Combustion Synthesis and Characterization of Ultrafine LiFe0.95Ti0.05PO4 and LiFePO4 Polycrystalline Materials

2020 ◽  
Author(s):  
Youngil Lee ◽  
Laxman Singh ◽  
Dev Kumar Mahato ◽  
R.N. Rai ◽  
Ashok Kumar Gupta
Keyword(s):  
Citric Acid ◽  
Low Cost ◽  
Sol Gel ◽  
Metal Nitrate ◽  
Polycrystalline Materials ◽  
Quality Life ◽  
Auto Combustion ◽  
Calcination Method ◽  
Sol Gel Synthesis ◽  
Combustion Residue

Abstract A solution based economically low cost, eco-friendly and energetically advantageous alternative route for the fabrication of ultrafine LiFe0.95Ti0.05PO4 and LiFePO4, polycrystalline material by semi-wet combustion and sol-gel synthesis is presented. The thermal analysis, crystal structure, morphology and composition of the materials were investigated using different physio-chemical characterizations. TG/DTA, X-ray diffraction, TEM, SEM, EDX, and XPS. The route required auto-combustion of an aqueous metal nitrate solutions in air with the aid of citric acid and is efficient for the fabrication of high quality, LiFe0.95Ti0.05PO4 and LiFePO4 at low temperature, in the combustion residue itself. On a micro-structural studies the grain size was seen in submicron-size that was acquired in a long-established sol-gel combustion and succeeding calcination method. Consequently, the present method reported can yield the ultrafine LiFePO4 and LiFe0.95Ti0.05PO4 at moderate temperature and is look forward to be applicable for other iso-structural polycrystalline materials.

scholarly journals Application of ultrasonic irradiation to the sol–gel synthesis of silver vanadium oxides

2005 ◽  
Vol 12 (4) ◽  
pp. 289-293 ◽  
Author(s):  
Jinggang Xie ◽  
Xiaoyu Cao ◽  
Jinxia Li ◽  
Hui Zhan ◽  
Yongyao Xia ◽  
...  
Keyword(s):  
Ultrasonic Irradiation ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Sol Gel Synthesis

scholarly journals Synthesis of Core–Double Shell Nylon-ZnO/Polypyrrole Electrospun Nanofibers

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2241
Author(s):  
Mihaela Beregoi ◽  
Nicoleta Preda ◽  
Andreea Costas ◽  
Monica Enculescu ◽  
Raluca Negrea ◽  
...  
Keyword(s):  
Sol Gel ◽  
Electrospun Nanofibers ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
Zno Film ◽  
X Ray ◽  
Wide Range ◽  
Sol Gel Process ◽  
Sol Gel Synthesis ◽  
Inorganic Layers

Core–double shell nylon-ZnO/polypyrrole electrospun nanofibers were fabricated by combining three straightforward methods (electrospinning, sol–gel synthesis and electrodeposition). The hybrid fibrous organic–inorganic nanocomposite was obtained starting from freestanding nylon 6/6 nanofibers obtained through electrospinning. Nylon meshes were functionalized with a very thin, continuous ZnO film by a sol–gel process and thermally treated in order to increase its crystallinity. Further, the ZnO coated networks were used as a working electrode for the electrochemical deposition of a very thin, homogenous polypyrrole layer. X-ray diffraction measurements were employed for characterizing the ZnO structures while spectroscopic techniques such as FTIR and Raman were employed for describing the polypyrrole layer. An elemental analysis was performed through X-ray microanalysis, confirming the expected double shell structure. A detailed micromorphological characterization through FESEM and TEM assays evidenced the deposition of both organic and inorganic layers. Highly transparent, flexible due to the presence of the polymer core and embedding a semiconducting heterojunction, such materials can be easily tailored and integrated in functional platforms with a wide range of applications.

Sign in / Sign up

Export Citation Format

Share Document