Gas sensing mechanism of TiO2-based thin films

Zakrzewska, K.

doi:10.1016/j.vacuum.2003.12.152

Cited by 85 publications

(45 citation statements)

References 6 publications

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“…The crystallographic defects due to grain boundaries and oxygen vacancies in TiO 2 thin films along with high refractive index and large band gap make it a suitable material for a vast variety of applications. TiO 2 thin films deposited on different substrates exhibit gas sensing activity [2] in which diffusion of point defects plays an important role in gas-solid interactions in TiO 2 based sensors [3]. Cobalt doped TiO 2 thin films exhibit ferromagnetic behavior, which makes it a suitable material for spintronic applications [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Sankar

Gopchandran²

2009

Cryst. Res. Technol.

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Nanostructured titanium dioxide thin films were prepared using reactive pulsed laser ablation technique. Effects of annealing on the structural, morphological, electrical and optical properties are discussed. The structural, electrical and optical properties of TiO 2 films are found to be sensitive to annealing temperature and are described with GIXRD, SEM, AFM, UV-Visible spectroscopy and electrical studies. X-ray diffraction studies showed that the as-deposited films were amorphous and at first changed to anatase and then to rutile phase with increase of annealing temperature. Optical constants of these films were derived from the transmission spectra and the refractive index dispersion of the films, subjected to annealing at different temperatures, is discussed in terms of the single oscillator-Wemple and Didomenico model.

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Section: Introductionmentioning

confidence: 99%

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Sankar

Gopchandran²

2009

Cryst. Res. Technol.

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“…TiO 2 nanosheets with exposed {001} facets and {100} facets were fabricated by a simple hydrothermal method, as reported in the literature [25,18]. For {001}-TiO 2 nanosheets, 6.25 ml of Ti(OBu) 4 and 0.75 ml of hydrofluoric acid solution were mixed. The mixture was transferred into a Teflon-line stainless steel autoclave and maintained at 180 • C for 24 h. For {100}-TiO 2 nanosheets, 19 g of Ti(OBu) 4 was dispersed in 25 g of N,N-dimethylethanolamine (DMEA) with the aid of ultrasound, then 32 g distilled water was added rapidly.…”

Section: Preparation Of Tio 2 Nanostructures With Different Exposed Fmentioning

confidence: 99%

“…For {001}-TiO 2 nanosheets, 6.25 ml of Ti(OBu) 4 and 0.75 ml of hydrofluoric acid solution were mixed. The mixture was transferred into a Teflon-line stainless steel autoclave and maintained at 180 • C for 24 h. For {100}-TiO 2 nanosheets, 19 g of Ti(OBu) 4 was dispersed in 25 g of N,N-dimethylethanolamine (DMEA) with the aid of ultrasound, then 32 g distilled water was added rapidly. The suspension was transferred into a Teflon autoclave and heated at 150 • C for 16 h. Naturally cooled to room temperature, the white precipitates were separated from the reaction media by centrifugation and were respectively washed with ethanol and distilled water several times, then dried at 70 • C.…”

Section: Preparation Of Tio 2 Nanostructures With Different Exposed Fmentioning

confidence: 99%

Improving the performance of quantum dot-sensitized solar cells by using TiO₂nanosheets with exposed highly reactive facets

You¹,

Jiang²,

Han³

et al. 2013

Nanotechnology

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We demonstrated CdS quantum dot-sensitized solar cells (QDSSCs) based on anatase TiO 2 nanosheets with exposed {001} and {100} facets. Under the illumination of one Sun (AM 1.5 G, 100 mW cm −2 ), the photovoltaic conversion efficiencies were 2.29% for a QDSSC based on {001}-TiO 2 nanosheets, 2.18% for a QDSSC based on {100}-TiO 2 nanosheets, and 1.46% for a QDSSC based on commercial Degussa P25. It was found that the exposed highly reactive facets of TiO 2 nanosheets had a remarkable influence on the QDSSCs due to their better adsorption abilities for QDs, leading to the high short current density and the enhanced photovoltaic performance.

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“…Previous results showed that substitution of cations, such as Nb, Ta, or Cr, can enhance the gas-sensing properties of TiO 2 [25][26][27][28]. Nb ions were found to affect the equilibrium reaction between the point defects in the bulk of sensing materials, thus enhancing the gas-sensor performance [25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured TiO2-based mixed metal oxides prepared using microemulsions for carbon monoxide detection

et al. 2007

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Nanostructured powders of Nb-doped TiO2 (TN) and SnO2 mixed with Nb-doped TiO2 in two different atomic ratios-10 to 1 (TSN 101) and 1 to 1 (TSN 11)-were synthesized using the reverse micelle microemulsion of a nonionic surfactant (brine solution/1-hexanol/Triton X-100/cyclohexane). The powders were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Thick films were fabricated for gas sensors and characterized by XRD analysis and field emission scanning electron microscopy (FE-SEM). The effects of the film morphology and firing temperature in the range 650-850 °C on CO sensitivity were studied. The best gas response, expressed as the ratio between the resistance in air and the resistance under gas exposure (R air/R gas), was measured for TSN 11 at 11 for 1,000 ppm CO exposure. All types of sensors showed good thermal stability. The electrochemical impedance spectroscopy (EIS) measurements were performed in different gas atmospheres (air, O2, CO and NO 2) to better understand the electrical properties of the nanostructured mixed metal oxides. © 2007 Springer Science+Business Media, LLC

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Gas sensing mechanism of TiO2-based thin films

Cited by 85 publications

References 6 publications

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Improving the performance of quantum dot-sensitized solar cells by using TiO₂nanosheets with exposed highly reactive facets

Nanostructured TiO2-based mixed metal oxides prepared using microemulsions for carbon monoxide detection

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Gas sensing mechanism of TiO2-based thin films

Cited by 85 publications

References 6 publications

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO2 thin films

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO2 thin films

Improving the performance of quantum dot-sensitized solar cells by using TiO2nanosheets with exposed highly reactive facets

Nanostructured TiO2-based mixed metal oxides prepared using microemulsions for carbon monoxide detection

Contact Info

Product

Resources

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Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Effect of annealing on the structural, electrical and optical properties of nanostructured TiO₂ thin films

Improving the performance of quantum dot-sensitized solar cells by using TiO₂nanosheets with exposed highly reactive facets