Nanopowders of chromium doped TiO2 for gas sensors

Lyson-Sypien, Barbara; Czapla, A.; Lubecka, M.; Gwiżdż, P.; Schneider, Krystyna; Zakrzewska, K.; Michalow, Katarzyna A.; Graule, Thomas; Reszka, A.; Rękas, M.; Łącz, Agnieszka; Radecka, M.

doi:10.1016/j.snb.2012.02.051

Cited by 83 publications

(32 citation statements)

References 60 publications

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“…In order to synthesize Cr doped TiO 2 nanopowders with a controlled grain size, the Flame Spray Synthesis technique was used as described in [33] Brunauer -Emmett -Teller adsorption isotherm, BET, were obtained with Beckman -Coulter SA 3100 analyzer. BET technique was used to determine Specific Surface Area, SSA, from which the equivalent particle diameter, d BET , was calculated according to the formula:…”

Section: Methodsmentioning

confidence: 99%

“…• C in the synthetic air working as a reference atmosphere and H 2 concentration in the range of 50 -3000 ppm as it is described in [33].…”

Section: Methodsmentioning

confidence: 99%

“…The subject of our research is to study possible changes in crystallographic, electronic structure, electrical properties as well as gas sensing characteristics of TiO 2 . Previously, our research on TiO 2 : Cr took into account both the influence of grain size and dopant amount [33]. In this work, the grain size was controlled so as to study the impact of Cr concentration, only.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Sensor Of TiO2-Based Nanomaterials

Lyson-Sypien¹,

Zakrzewska²,

Gajewska³

et al. 2015

Archives of Metallurgy and Materials

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The aim of this research was to examine gas sensing properties of TiO 2 based nanomaterials. Nanopowders of Cr doped TiO 2 with constant Specific Surface Area, SSA, were obtained using Flame Spray Synthesis technique, FSS. Nanomaterials were characterized by Brunauer -Emmett -Teller adsorption isotherms, BET, X -ray diffraction, XRD, Transmission Electron Microscopy, TEM, optical spectrometry UV -vis with the use of an integrating sphere as well as impedance spectroscopy. Detection of hydrogen was carried out over the concentration range of 50 -3000 ppm at the temperatures extending from 200 to 400• C and synthetic air working as a reference atmosphere. As a result of experiments it appeared that incorporation of 5 at.% of Cr into TiO 2 improved hydrogen sensing features due to small crystallite size and predominance of rutile polymorphic phase.Keywords: TiO 2 nanomaterials, Cr dopant, hydrogen sensor Przedmiotem pracy są nanomateriały na bazie TiO 2 do zastosowań sensorowych. Nanoproszki TiO 2 domieszkowane chromem o stałej powierzchni właściwej SSA (ang. Specific Surface Area) otrzymano przy pomocy techniki syntezy w płomieniu FSS (ang. Flame Spray Synthesis). Materiały poddano charakteryzacji z wykorzystaniem: izoterm adsorpcyjnych Brunauer -Emmett -Teller, BET, dyfraktometrii rentgenowskiej, XRD, transmisyjnej mikroskopii elektronowej, TEM, spektroskopii optycznej UV -vis oraz spektroskopii impedancyjnej. Pomiar własności sensorowych został przeprowadzony dla koncentracji H 2 w zakresie 50-3000 ppm w przedziale temperatur 200-400• C. Wykazano, że najlepiej na wodór odpowiada próbka TiO 2 : 5at.% Cr charakteryzująca się małym rozmiarem krystalitów oraz przewagą fazy rutylu.

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Section: Methodsmentioning

confidence: 99%

“…• C in the synthetic air working as a reference atmosphere and H 2 concentration in the range of 50 -3000 ppm as it is described in [33].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen Sensor Of TiO2-Based Nanomaterials

Lyson-Sypien¹,

Zakrzewska²,

Gajewska³

et al. 2015

Archives of Metallurgy and Materials

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“…Typically, the performance of metal oxide gas sensors can be improved by their construction. This may involve using nanostructured materials which offer an increased sensitivity and selectivity [9][10][11]. However, the overall performance of metal oxide gas sensors can be enhanced without a modification of the sensor construction.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Detection With a Gas Sensor Array – Processing and Recognition of Dynamic Responses Using Neural Networks

Gwiżdż

Brudnik

Zakrzewska

2015

Metrology and Measurement Systems

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An array consisting of four commercial gas sensors with target specifications for hydrocarbons, ammonia, alcohol, explosive gases has been constructed and tested. The sensors in the array operate in the dynamic mode upon the temperature modulation from 350°C to 500°C. Changes in the sensor operating temperature lead to distinct resistance responses affected by the gas type, its concentration and the humidity level. The measurements are performed upon various hydrogen (17-3000 ppm), methane (167-3000 ppm) and propane (167-3000 ppm) concentrations at relative humidity levels of 0-75%RH. The measured dynamic response signals are further processed with the Discrete Fourier Transform. Absolute values of the dc component and the first five harmonics of each sensor are analysed by a feed-forward back-propagation neural network. The ultimate aim of this research is to achieve a reliable hydrogen detection despite an interference of the humidity and residual gases.

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“…Transition metal ions like Cr 3+ [5][6][7], W 6+ [8][9][10] or Nb 5+ [11] were introduced into TiO 2 to generate localized narrow bands in the forbidden band and thus to improve light absorption and photoactivity of TiO 2 in the visible range. It is known that acceptor type of doping like Cr 3+ has a tremendous effect on the optical properties of TiO 2 [7,12]. However, there are controversial results concerning the influence of Cr on photocatalytic activity of the host material [5,13,14].…”

Section: Introductionmentioning

confidence: 99%