Spectroscopic and electrical properties of SiO2 films prepared by simple and cost effective sol–gel process

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

doi:10.1016/j.saa.2010.11.051

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…According to the results, the structural properties of the coatings synthesized in our study both by acid and base catalysis are in good agreement with the literature data [11,[21][22][23]. The transmittance values, especially for base catalyzed SiO2 coatings are higher compared to the previous studies [3,10,13]. It is believed that the nanoporous structure is the reason for very high transmittance values when compared to SiO2 coatings deposited with other techniques [3] and higher degrees of basicity when compared with sol-gel based deposition techniques [10].…”

Section: Resultssupporting

confidence: 90%

“…Numerous techniques have been used to deposit SiO2 coatings such as, sputtering, chemical vapor deposition, chemical etching and sol-gel process [8]. Recently, SiO2 coating synthesis by sol-gel process has become a new alternative method because of its several advantages such as low equipment costs, large area deposition at room temperature, good homogeneity, ease of composition control and possibility of deposition on curved substrates [9,10].…”

Section: Investigation Of Sio 2 Coatings Synthesized By Acid and Basementioning

confidence: 99%

“…With the base catalysis, the silica coating turns out to be a kind of nice optical material with low optical constant, while its scratch resistance is relatively low, in contrast, with acid catalysis silica coating has too dense to have porous structure [9]. The catalyzer type has very high importance for SiO2 sol-gel production in the hydrolysis and condensation process and the type of the catalyzer determines the pH value of the solution [9][10]. From previous studies, it is known that SiO2 coating microstructure has a dense network with enhanced hydrolysis process for pH value below 7, and above 7 exhibits a porous network with the improving condensation process [11][12][13].…”

Section: Investigation Of Sio 2 Coatings Synthesized By Acid and Basementioning

confidence: 99%

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Asit ve Baz Kataliz Sol-Jel Daldırmalı Kaplama Tekniği ile Üretilen SiO2 Kaplamaların İncelenmesi

Tavşanoğlu¹

2019

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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Present study deals with the effect of acid and base catalysis on SiO2 coating properties that were synthesized by sol-gel dip coating technique. Microstructural properties of the coatings were characterized by SEM and EDS was used to determine the coating composition. Spectrophotometer has been used to measure the optical properties of the coatings. The results demonstrated that SiO2 coatings deposited by both acid and base catalysis sol-gel dip coating technique were homogeneous and well-adherent. Acid catalyzed SiO2 coatings resulted with dense and smooth surface morphologies whereas base catalyzed SiO2 coatings had nanoporous structure with nanovoids ranging between 15-30 nm. According to the optical analyses, SiO2 coatings have very high transmittance values demonstrating that they are highly transparent especially in the visible light range.

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Section: Resultssupporting

confidence: 90%

Section: Investigation Of Sio 2 Coatings Synthesized By Acid and Basementioning

confidence: 99%

Section: Investigation Of Sio 2 Coatings Synthesized By Acid and Basementioning

confidence: 99%

See 1 more Smart Citation

Asit ve Baz Kataliz Sol-Jel Daldırmalı Kaplama Tekniği ile Üretilen SiO2 Kaplamaların İncelenmesi

Tavşanoğlu¹

2019

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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“…F d (" v) describes the emission intensity of the donor and e(" v) the extinction coefficient of the acceptor at the wavenumber " v. Taking the refractive index in the sol-gel film to be 1.45 [34] and the extinction coefficient for Texas Red at its maximum absorption as 85 000 m À1 cm À1 , [35] then the Fçrster distance for energy transfer in the sol-gel film from Equation (1) is 60.3 . In water, the value obtained for R o is 61.5 .…”

Section: Steady-state Spectramentioning

confidence: 99%

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

et al. 2011

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The efficiency of Förster resonance energy transfer (FRET) can be enhanced in the presence of a metal. Herein, we demonstrate the increased efficiency for a novel model sensor system where FRET is shown to occur between Rhodamine 6G in the bulk sol-gel matrix and Texas Red, which is held a fixed distance away by covalent attachment onto a silane spacer. Silver colloids are formed using light to initiate the reduction of a silver salt, which can be achieved at controlled locations within the film. Both the fluorescence intensity and lifetime maps and analysis indicate that an enhanced FRET efficiency has been achieved in the presence of silver nanoparticles. An increase in efficiency of 1.2-1.5 times is demonstrated depending on the spacer used. The novelty of our approach lies in the method of silver-nanoparticle formation, which allows for the accurate positioning of the silver nanoparticles and hence selective fluorescence enhancement within a biocompatible host material. Our work gives a practical demonstration of metal-enhanced FRET and demonstrates the ability of such systems to be developed for molecular-recognition applications that could find use in lab-on-a-chip technologies.

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“…Metal oxide thin films were deposited by various physical [5], [6] and chemical methods [7], [8]. ZnFe 2 O 4 thin film or powder was prepared by various methods, including hydrothermal synthesis [9], co-precipitation method [10], and sol-gel method [11].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of ZnFe<sub>2</sub>O<sub>4</sub> Thin Film Based Metal-Insulator-Semiconductor Capacitors

Vishwas

Rao

Raichur

2015

ILCPA

Self Cite

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Thin films of zinc ferrite (ZnFe 2 O 4 ) were deposited on glass, quartz and p-silicon (100) substrates by the sol-gel method. The structural properties of the films were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The XRD data show the film having a spinel structure and the crystalline phase exists after annealing at 500 o C for 2 h in air. The SEM and AFM images show the nano-crystalline nature of the films. The optical transmittance decreased with increase of annealing temperature. The optical band gap energy was estimated at different annealing temperatures and found to be 2.71 eV after annealing at 400 o C. The metal-insulator-semiconductor (MIS) capacitors were fabricated using ZnFe 2 O 4 films on p-silicon (100) substrates. The capacitance-voltage (C-V), dissipation-voltage (D-V) and currentvoltage (I-V) characteristics were studied. The dependence of dielectric constant on annealing temperature and signal frequency was analyzed. The variation of current density and resistivity of the ZnFe 2 O 4 films with annealing temperature was also explored.

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Spectroscopic and electrical properties of SiO2 films prepared by simple and cost effective sol–gel process

Cited by 17 publications

References 17 publications

Asit ve Baz Kataliz Sol-Jel Daldırmalı Kaplama Tekniği ile Üretilen SiO2 Kaplamaların İncelenmesi

Asit ve Baz Kataliz Sol-Jel Daldırmalı Kaplama Tekniği ile Üretilen SiO2 Kaplamaların İncelenmesi

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

Fabrication and Characterization of ZnFe<sub>2</sub>O<sub>4</sub> Thin Film Based Metal-Insulator-Semiconductor Capacitors

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