Synthesis and photoluminescence of well-dispersible anatase TiO2 nanoparticles

The present study aims at deposition of zinc phosphate coatings on low carbon steel with incorporated nano-TiO 2 particles by chemical phosphating method. The coated low carbon steel samples were assessed in corrosion studies using electrochemical impedance spectroscopy and potentiodynamic polarization techniques (Tafel) in 3.5% NaCl solution. Morphology and chemical composition of the coatings were analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy in order to observe growth of coating. Significant variations in the coating weight, porosity and corrosion resistance were observed with the addition of nanoTiO 2 in the phosphating bath. Corrosion rate of nano-TiO 2 chemical phosphate coated samples was found to be 3.5 milli inches per year which was 3 times less than the normal phosphate-coated sample (8 mpy). Electrochemical impedance spectroscopy studies reveal reduction of porosity of nano-TiO 2 phosphate coated samples. It was found that nano-TiO 2 particles in the phosphating solution yielded uniform phosphate coatings of higher coating weight, fewer defects and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal phosphating bath).

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“…All peaks in the XRD patterns could be indexed to anatase phase of TiO 2 and diffraction data are in good agreement with JCPDS data [8].…”

Section: Synthesis and Characterization Of Nano-tio 2 Powdersupporting

confidence: 83%

Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach

Bagal¹,

Kathavate²,

Deshpande

2018

Electrochemical Energy Technology

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“…Among these, anatase has excellent chemical and physical properties for environmental purification and is thermodynamically more stable than rutile phase. Furthermore, titania possess high available surface areas, which are beneficial for aqueous photocatalytic reactions [3]. The photocatalytic activity can increase dramatically, when the particle size of TiO 2 decreases.…”

Section: Introductionmentioning

confidence: 99%

“…There is small hump at 395 nm for the sample annealed at 950 o C with strong emission peak of rutile phase at 413 nm. Since PL emission was the result of the recombination of excited electrons and holes, the lower PL intensity of the modified sample indicated a lower recombination rate of excited electrons and holes [3]. International Journal of Materials, Mechanics and Manufacturing, Vol.…”

mentioning

confidence: 99%

Influence of Surfactants on TiO2 Nanoparticles Grown by Sol-Gel Technique

Dastan¹,

Chaure²

2014

IJMMM

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Abstract-TiO 2 nanoparticles were prepared at room temperature by sol-gel method. In the current work, different surfactants such as Acetic Acid (AA), Oleic Acid (OA), and Oley amine (OM) were used for the preparation of TiO 2 nanoparticles. TiO 2 powder was collected by centrifuging precipitation obtained during gel formation. The powder was thoroughly cleaned few times in ethanol and annealed at 550o C and 950o C at specific time. I-V measurement is used to investigate the electrical properties of TiO 2 pallets. In order to elucidate the influence of using these surfactants, the structural and optical properties of powder were investigated by means of X-ray diffraction (XRD), U-v visible, and Photoluminescence (PL). It was found that annealing could improve the crystallization of TiO 2 powders and accelerated the phase transformation from anatase to rutile phase but surfactants do not change the particle size and energy band gap of titania.Index Terms-TiO 2 Powder, sol-gel, surfactants, annealing, electrical, optical, and structural properties. I. INTRODUCTIONResearchers have tried to find an insulator with a higher dielectric constant, large band gap, significant conduction band offset and high breakdown strength. Titanium is the ninth most abundant element in the Earth's crust [1]. Titanium dioxide (TiO 2 ) has high thermal and chemical stability and high transmittance in the visible spectral range [2]. Moreover, it is nontoxic, and applicable for biological coatings, optical devices, and photo electrochemical conversion, environmental photocatalytic processes such as prevention of strains, sterilization and removal of pollutants from air and water [1], sensors, preparation of solar energy cells, fabricating thin dielectrics in dynamic random access memory (DRAM) storage capacitors and as a gate dielectric of FETs [2].TiO 2 could be formed in three possible crystallographic phases such as anatase, rutile, and brookite. Among these, anatase has excellent chemical and physical properties for environmental purification and is thermodynamically more stable than rutile phase. Furthermore, titania possess high available surface areas, which are beneficial for aqueous photocatalytic reactions [3]. The photocatalytic activity can increase dramatically, when the particle size of TiO 2 decreases. The most popular commercial form of B. Preparation of TiO 2 NanoparticlesAcetic Acid was added drop wise in absolute ethanol under vigorous stirring and a transparent solution was obtained. Subsequently, TIP was added drop wise to the solution to form the uniform solutions. The molar ratio of TIP/Ethanol/AA was kept 1:9:0.1 during the synthesis part. The same ratio was maintained using OA, whereas (1:9:0.2) ratio was kept in case of using OM as a surfactant [5]. The sol was further subjected to stirring for 24 h, and then the gel particles were separated by centrifugation under 12000 rpm followed by intermittent washing with ethanol thrice. The resulted precipitate was dried at room temperature. The collected nano-TiO 2 powd...

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“…It was reported that 0D TiO2 nanoparticles were syn-thesized from mesoporous silica hard templates such as SBA-15 and KIT-6 [72,73]. In the hard-template assisted synthesis of TiO2 nanoparticles reported by Zhao et al [72], 0.5 g dried SBA-15 powders was dispersed in a mixed solution containing 2 mL titanium tetrabutylorthotitanate (TTBT) and 5 mL ethanol.…”

Section: Hard-template Assisted Synthesis Of 0d Nanostructuresmentioning

confidence: 99%

“…The sizes of the well-controlled TiO2, SnO2, and ZnO nanoparticles that were synthesized from mesoporous hard templates exhibited obvious improvements, making them attractive for applications in photoluminescence, gas sensing, glycol conversion, etc. [72][73][74].…”

Section: Hard-template Assisted Synthesis Of 0d Nanostructuresmentioning

confidence: 99%

Strategies for designing metal oxide nanostructures

2016

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There has been exponential growth in research activities on nanomaterials and nanotechnology for applications in emerging technologies and sustainable energy in the past decade. The properties of nanomaterials have been found to vary in terms of their shapes, sizes, and number of nanoscale dimensions, which have also further boosted the performance of nanomaterial-based electronic, catalytic, and sustainable energy conversion and storage devices. This reveals the importance and, indeed, the linchpin role of nanomaterial synthesis for current nanotechnology and high-performance functional devices. In this review, we provide an overview of the synthesis strategies for designing metal oxide nanomaterials in zerodimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) forms, particularly of the selected typical metal oxides TiO2, SnO2 and ZnO. The pros and cons of the typical synthetic methods and experimental protocols are reviewed and outlined. This comprehensive review gives a broad overview of the synthetic strategies for designing "property-on-demand" metal oxide nanostructures to further advance current nanoscience and nanotechnology.

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Synthesis and photoluminescence of well-dispersible anatase TiO2 nanoparticles

Cited by 110 publications

References 23 publications

Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach

Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach

Influence of Surfactants on TiO2 Nanoparticles Grown by Sol-Gel Technique

Strategies for designing metal oxide nanostructures

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