Optical, electrical and dielectric properties of TiO2–SiO2 films prepared by a cost effective sol–gel process

Vishwas, M.; Rao, K. Narasimha; Gowda, K.V. Arjuna; Chakradhar, R.P.S.

doi:10.1016/j.saa.2011.08.009

Cited by 36 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Those bands are characteristic for the deformation vibration of Si-O-Mg, which evidence the formation of specific chemical species. At the wavenumber of 538 cm -1 there is a clear band, derived from stretching vibration of Si-O-Si bonds, that are present in the structure of the analyzed material [28]. In turn, a signal at 1,630 cm -1 , related with a bending vibrations, is derived from water molecules that have been physically adsorbed on the surface of the resulting powder.…”

Section: Ft-ir Analysismentioning

confidence: 95%

“…The powders prepared based on the sol-gel method confirm its efficiency and versatility, and in addition are characterized by specific properties and can be used in many advanced technologies [27][28][29][30]. Bayala et al [27] described the possibility of obtaining hybrid materials based on NiO (NiOÁZnO, NiOÁCuO, NiOÁMgO) which offer high thermal stability and can be used as catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…The authors proved that the selection of appropriate reactants and controlling the parameters of the sol-gel process determine the type of the materials and its physicochemical as well as useful properties. In turn, using titanium tetraisopropoxide (TTIP) and tetraethoxysilane (TEOS), it is possible, under appropriate process conditions, to obtain a hybrid TiO 2 ÁSiO 2 powders with specific optical properties for advanced manufacturing technology [28]. A study of the same materials (TiO 2 ÁSiO 2 ) is presented by Aguado et al [29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

Ciesielczyk

Przybysz

Zdarta

et al. 2014

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

The physicochemical properties of synthetic powders depend strongly on the method of their preparation. The present work concerns the use of the sol-gel method to prepare xMgOÁySiO 2 powders with defined physicochemical and structural properties. An important objective was to determine how the basic process parameters (including the type and concentration of the reactants) influence the physicochemical properties of the resulting material. To obtain a synthetic powders, organic precursors of magnesium (magnesium ethoxide), and silicon (tetraethoxysilane) were used. Selected products were subjected to calcination to identify the crystalline structure of the powders and to determine the impact of the proposed method of preparation on this parameter. This aspect of the research will significantly improve the range of application of the manufactured products. The powders obtained by the proposed method were thoroughly analyzed in terms of chemical composition, crystalline structure, morphology and nature of dispersion, parameters of porous structure, and thermal as well as electrokinetic properties. The solgel process proved very effective in the synthesis of highly active powders, as evidenced by the very high values obtained for the products' surface area. It was also confirmed that the physicochemical parameters are strongly dependent on the mass ratio of the reactants and on the method of final treatment of the precipitates.

show abstract

Section: Ft-ir Analysismentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

Ciesielczyk

Przybysz

Zdarta

et al. 2014

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

show abstract

“…This is a very important fact with regard to the adsorption of positively charged metal ions, as is the quantity of active hydroxyls present on the adsorbent surface as confirmed by the FTIR spectrum of the analyzed sample. The FTIR spectrum also shows signals characteristic for sol-gel-derived MgO-SiO 2 oxide adsorbent: 3650-3350 cm -1 -stretching vibrations of hydroxyls; 1050 cm -1 and 890 cm -1 -stretching vibrations of Si-O bonds; 645 cm -1 -deformation vibrations of Si-O-Mg bonds; 630 cm -1 -deformation vibrations of OMg-O bonds; 540 cm -1 -stretching vibrations of O-Si-O (Chabrol et al 2010;Ciesielczyk et al 2014;Lan et al 2012;Vishwas et al 2011). According to the literature (Karthik and Meenakshi 2015a, b), low pH values are unfavorable for metal ion adsorption, since in that range they are present in solution in free form as M n?…”

Section: Sorption Processmentioning

confidence: 95%

Removal of cadmium(II) and lead(II) ions from model aqueous solutions using sol–gel-derived inorganic oxide adsorbent

2015

View full text Add to dashboard Cite

A study was conducted concerning the preparation and application of a novel synthetic oxide adsorbent of MgO-SiO 2 type. The material was prepared via a sol-gel route, utilizing magnesium ethoxide and tetraethoxysilane as precursors of magnesium oxide and silica respectively, and ammonia as a catalyst. The powder was comprehensively analyzed with regard to chemical composition (EDS method), crystalline structure, morphology, characteristic functional groups, electrokinetic stability and porous structure parameters (BET and BJH models). The synthesized oxide adsorbent is amorphous, with irregularly shaped particles, a relatively large surface area of 612 m 2 /g, and negative surface charge over almost the whole pH range. Comprehensive adsorption studies were performed to investigate the adsorption of Cd(II) and Pb(II) ions on the MgO-SiO 2 oxide adsorbent, including evaluation of adsorption kinetics and isotherms, the effect of pH, contact time and mass of adsorbent. It was shown that irrespective of the conditions of the adsorption process, the synthesized MgO-SiO 2 adsorbent exhibits slightly better affinity to lead(II) than to cadmium(II) ions (sorption capacity of 102.02 mg(Pb 2? )/g and 94.05 mg(Cd 2? )/g). The optimal time for removal of the analyzed metal ions was 60 min, although adsorption reached equilibrium within 10 min for Pb(II) and within 15 min for Cd(II) ions, which was found to fit well with a type 1 pseudo-second-order kinetic model. Additionally, adsorption efficiency was affected by the pH of the reaction system-better results were obtained for pH C7 irrespective of the type of metal ion.

show abstract

“…Among them are those related to the production of optical materials with a wide range of refractive indices (Wang et al, 1999;Chen et al, 2003), materials for photocatalysis (Aziz & Sofyan, 2009;Arun et al, 2012), and sensors with a high surface hydroxyl group and surface area (Shumaila et al, 2015), as well as dielectric materials with a very low leakage current and high dielectric constant (Vishwas et al, 2011). A promising and actively studied variety of the latter is the dielectric material used for high energy density capacitors, which is characterized by the absence of phase separation of SiO 2 and TiO 2 in the composite.…”

Section: Introductionmentioning

confidence: 99%

Formation and Particle Growth of TiO2 in Silica Xerogel Glass Ceramic During a Sintering Process

Aripin¹,

Made²,

Mitsudo³

et al. 2017

IJTech

View full text Add to dashboard Cite

This investigation presents the synthesis procedure and the results of an investigation of the crystallite growth of TiO 2 and the formation of Si-O-Ti bonds in novel silica xerogel (SiO 2 ) glass ceramic produced from an amorphous SX derived from sago waste ash. The composition had been prepared by adding various amounts of TiO 2 , from 20 wt% to 80 wt%, into the amorphous SiO 2 , and then a series of samples were sintered at 1200°C for 2 hours. The influence of the content of TiO 2 and the sintering temperature on the properties of TiO 2 , namely crystallite size and formation of Si-O-Ti bonds, has been studied in detail. The properties of the produced ceramics have been characterized on the basis of the experimental data obtained using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. It has been found that an addition of SiO 2 confers an appreciable effect on the quantity of Si-O-Ti bonds. The interpretation of the XRD pattern allows one to explain the increase in the crystallite size of rutile TiO 2 by a decreased quantity of Si-O-Ti bonds.

show abstract

Optical, electrical and dielectric properties of TiO2–SiO2 films prepared by a cost effective sol–gel process

Cited by 36 publications

References 15 publications

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

Removal of cadmium(II) and lead(II) ions from model aqueous solutions using sol–gel-derived inorganic oxide adsorbent

Formation and Particle Growth of TiO2 in Silica Xerogel Glass Ceramic During a Sintering Process

Contact Info

Product

Resources

About