Effect of crystallization on humidity sensing properties of sol–gel derived nanocrystalline TiO2 thin films

Biju, K.; Jain, Mahaveer K.

doi:10.1016/j.tsf.2007.06.147

Cited by 86 publications

(42 citation statements)

References 22 publications

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“…Titanium dioxide (TiO 2 ) nanopowder is continually receiving attention for use as photocatalysts [1], photonic crystals [2], photovoltaic cells [3], and gas sensors [4]. It is also anticipated for use as a strong deoxidation material used for producing hydrogen gas from water for fuel cells [5].…”

Section: Introductionmentioning

confidence: 99%

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Kodama¹,

Tanaka²,

Kita³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract.A unique large-scale synthesis method for Al-doped TiO 2 nanopowder was developed using 20-kW Ar-O 2 pulse-modulated induction thermal plasmas (PMITP) with time-controlled feedstock feeding (TCFF). This PMITP-TCFF method is characterized by intermittent feedstock powder feeding synchronized with modulated power of the PMITP. The method enables heavy-load feeding of raw material powder to the thermal plasmas for complete evaporation. Synthesized nanopowder was analyzed using different methods including FE-SEM, XRD, BF-TEM, TEM/EDX mapping, XPS, and spectrophotometry. Results showed that Al-doped TiO 2 nanopowder can be synthesized with mean diameters of 50-60 nm. The Al doping in TiO 2 was confirmed from the constituent structure in XRD spectra, the uniform presence of Al on the nanopowder in TEM/EDX mapping, the chemical shift in XPS spectra, and the absorption edge shift in the optical property. The production rate of Al-doped TiO 2 nanopowder was estimated as 400 g h −1 .

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Section: Introductionmentioning

confidence: 99%

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Kodama¹,

Tanaka²,

Kita³

et al. 2014

J. Phys. D: Appl. Phys.

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“…The increase of conductivity with working temperature is expected, since number of charge carriers increases with temperature. On the other hand, the increase in the conductivity (decrease of resistivity) with annealing temperatures can be also explained as follows: the grain size increases with annealing temperature, which leads to a decrease in scattering on grain boundaries and hence in resistivity [24].…”

Section: Characterizationmentioning

confidence: 99%

Characterization of Ag-TiO₂Powders Prepared by Sol-Gel Process

et al. 2017

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In this study, microstructure and electrical properties of Ag-TiO2 powders, which were prepared by a simple sol-gel method, are investigated. The sol was prepared from titanium iso-propoxide, Ti(OC3H7)4 in iso-propanol (CH3CHOHCH3), used as solvent. AgNO3 was used as the precursor for Ag. For the structural studies, the corresponding gels were allowed to dry naturally for about seven days, dried in an oven at 180• C for 30 min and then calcined at different temperatures (900, 1000 and 1100• C). The Ag-TiO2 nanoparticles were characterized using differential thermal analysis/thermal gravimetry, scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. The results X-ray diffraction indicate that pure Ag and TiO2 powders are in rutile phase. However, calcination temperature had not significantly affected the crystalline structure of TiO2. Scanning electron microscopy images of powders show an aggregation of small spherical particles of dispersed sizes. Annealing of the Ag-TiO2 sample at high temperature produced more spherical particles, which aggregated to form bigger particles with porous structures. The electrical properties of the samples were measured using HMS-3000 Hall measurement system. The samples were found to be of n-type. IntroductionTitanium dioxide (TiO 2 ) has attracted interest due to such advantages, as effectiveness, chemical stability, nontoxicity, and relatively low cost, strong resistance to the chemical and photo-corrosion, low operational temperature, antibacterial properties and low energy consumption [1][2][3]. Titanium dioxide is one of the metal oxide semiconductors that have been widely examined for different purposes, since its physical and chemical properties show remarkable changes when the size of the TiO 2 approaches nm scale [4][5][6]. The modification of TiO 2 by means of metal doping can also affect the properties of TiO 2 . Silver, among the other metals, thanks to its high stability and excellent electrical and thermal conductivity, seems to be a favourable titania dopant [7,8]. In recent years, many researchers have investigated the effect of Ag nanoparticles on properties of TiO 2 [9][10][11][12][13][14][15]. Sol-gel is a low temperature, chemical solution method [16][17][18], which is a proven conventional method for preparation of composite Ag-TiO 2 compound.In this work, we have prepared nanosized TiO 2 and Ag-TiO 2 powders by sol-gel process, using titanium iso-propoxide and silver nitrate as precursors and isopropanol as solvent. The effects of Ag on the morphology, crystallization and phase transition of TiO 2 nanoparticles were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential thermal analysis (DTA) techniques.

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“…where k is a constant (shape factor, k = 0.89), is the wavelength of the incident light, Â (theta) is half of the diffraction angle (rad), and b is the full width at half-maximum (FWHM) of the diffraction line [29]. Based on the XRD results, Table 1 shows average particle sizes of TiO 2 films which are prepared with different water:AcAc volume ratios.…”

Section: Xrd Analysismentioning

confidence: 99%

Controlling the particle size of nanobrookite TiO2 thin films

Arıer

Tepehan

2011

Journal of Alloys and Compounds

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Effect of crystallization on humidity sensing properties of sol–gel derived nanocrystalline TiO2 thin films

Cited by 86 publications

References 22 publications

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Characterization of Ag-TiO₂Powders Prepared by Sol-Gel Process

Controlling the particle size of nanobrookite TiO2 thin films

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Effect of crystallization on humidity sensing properties of sol–gel derived nanocrystalline TiO2 thin films

Cited by 86 publications

References 22 publications

A method for large-scale synthesis of Al-doped TiO2nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO2nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Characterization of Ag-TiO2Powders Prepared by Sol-Gel Process

Controlling the particle size of nanobrookite TiO2 thin films

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Product

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A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Characterization of Ag-TiO₂Powders Prepared by Sol-Gel Process