Effect of Nb, Cr, Sn additions on gas sensing properties of TiO2 thin films

Zakrzewska, K.; Radecka, M.; Rękas, M.

doi:10.1016/s0040-6090(97)00401-x

Cited by 139 publications

(67 citation statements)

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“…Sn x Ti 1−x O 2 system has proven to be a good candidate for gas sensor [1,[3][4][5][6] and low-voltage varistor [7] application. For example, small additions of SnO 2 to TiO 2 lattice allow the operating temperature for hydrogen sensor to be lowered to about 500 • C [3].…”

Section: Introductionmentioning

confidence: 99%

“…For example, small additions of SnO 2 to TiO 2 lattice allow the operating temperature for hydrogen sensor to be lowered to about 500 • C [3]. It has also been shown that the response of SnO 2 sensors containing small additions of Ti is comparable with that of undoped SnO 2 , however the long-term stability is improved [4].…”

Section: Introductionmentioning

confidence: 99%

“…The knowledge of the bulk electronic structure of this mixed oxide would aid in the design of gas sensing devices and catalysts exhibiting unique features. Therefore, the structural and electronic properties of Sn x Ti 1−x O 2 solid solutions have been subjected to extensive experimental [1,[3][4][5][6]8,[12][13][14][15][16][17][18][19] and recent theoretical [20] studies. A detailed understanding of the electronic structure of Sn x Ti 1−x O 2 solid solution, however, lags behind these achievements.…”

Section: Introductionmentioning

confidence: 99%

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Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

et al. 2003

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The structural and electronic properties of selected compositions of Sn x Ti 1−x O 2 solid solutions (x = 0, 1/24, 1/16, 1/12, 1/8, 1/6, 1/4, 1/2, 3/4, 5/6, 7/8, 11/12, 15/16, 23/24 and 1) were investigated by means of periodic density functional theory (DFT) calculations at B3LYP level. The calculations show that the corresponding lattice parameters vary non-linearly with composition, supporting positive deviations from Vegard's law in the Sn x Ti 1−x O 2 system. Our results also account for the fact that chemical decomposition in Sn x Ti 1−x O 2 system is dominated by composition fluctuations along [0 0 1] direction. A nearly continuous evolution of the direct band gap and the Fermi level with the growing value of x is predicted. Ti 3d states dominate the lower portion of the conduction band of Sn x Ti 1−x O 2 solid solutions. Sn substitution for Ti in TiO 2 increases the oxidation-reduction potential of the oxide as well as it renders the lowest energy transition to be indirect. These two effects can be the key factors controlling the rate for the photogenerated electron-hole recombination. These theoretical results are capable to explain the enhancement of photoactivity in Sn x Ti 1−x O 2 solid solutions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

et al. 2003

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“…Диоксид титана со структурой рутила является широ-козонным (∼ 3.2 эВ) оптически прозрачным полупровод-ником n-типа и находит широкое применение в составе защитных, самоочищающихся покрытий [1] как фотока-тализатор для бытовой и промышленной очистки воды и воздуха [2], компонент сенсорных датчиков [3]. Функ-циональные свойства диоксида титана можно контроли-ровать путем модифицирования его различными добав-ками.…”

Section: Introductionunclassified

Взаимодиффузия и фазообразование в тонкопленочной системе Fe-TiO-=SUB=-2-=/SUB=-

Афонин¹,

Логачева²

2017

Физика И Техника Полупроводников

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Методами рентгенофазового анализа, вторично-ионной масс-спектрометрии, атомно-силовой микроскопии и математического моделирования исследовано взаимодействие магнетронным способом распыленного металлического железа с пленками оксида титана в процессе изотермического вакуумного отжига. Пред-ложен механизм формирования сложных оксидов на границах зерен, основанный на реакционной диффузии металла Fe в оксид титана. Разработана количественная модель реакционной взаимодиффузии в двухслойных поликристаллических пленочных системах металл−оксид с ограниченной растворимостью компонентов. Численным анализом экспериментальных концентрационных распределений металлов в пленочной системе Fe−TiO 2 определены значения индивидуальных коэффициентов диффузии: железа 8.0 · 10 −13 см 2 /с и титана 3.0 · 10 −15 см 2 /с в условиях вакуумного отжига при 1073 K.

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“…By doping the base material, variations in the sensorical sensitivity can be achieved and sensitivity toward certain gases may be generated. [1][2][3][4] By varying deposition parameters in the pulse sputtering process, TiO 2 films with adjustable crystalline phases ranging from amorphous to crystalline can be produced. [5] In the present study, the effect of doping on the gas sensitivity of nanocrystalline TiO 2 thin films has been investigated.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Photocatalytic and Gas Sensing Properties of Pure and N‐doped TiO₂ thin Films

Delan

Karuppasamy

Schultheiss

2009

Plasma Processes & Polymers

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A correlation between the photocatalytic efficiency and gas sensitivity has been attempted on pure and N‐doped TiO2 thin films prepared by pulsed DC magnetron sputtering. The physical properties are studied. The gas sensing behavior in pure and nitrogen doped TiO2 thin films could be realized at low temperature. The measurements start at 130 °C. The nitrogen doped TiO2 (3 sccm) has no sensitivity for oxygen. All sensors have sensitivity to hydrogen. If the temperature is increased the sensitivity is increased. All samples show photocatalytic activity. The photocatalytic and gas sensing properties have no significant correlations.

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Effect of Nb, Cr, Sn additions on gas sensing properties of TiO2 thin films

Cited by 139 publications

References 14 publications

Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

Взаимодиффузия и фазообразование в тонкопленочной системе Fe-TiO-=SUB=-2-=/SUB=-

A Comparative Study on the Photocatalytic and Gas Sensing Properties of Pure and N‐doped TiO₂ thin Films

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Effect of Nb, Cr, Sn additions on gas sensing properties of TiO2 thin films

Cited by 139 publications

References 14 publications

Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

Electronic and structural properties of SnxTi1−xO2 solid solutions: a periodic DFT study

Взаимодиффузия и фазообразование в тонкопленочной системе Fe-TiO-=SUB=-2-=/SUB=-

A Comparative Study on the Photocatalytic and Gas Sensing Properties of Pure and N‐doped TiO2 thin Films

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A Comparative Study on the Photocatalytic and Gas Sensing Properties of Pure and N‐doped TiO₂ thin Films