Development of a novel gas sensor based on oxide thick films

Arshak, K.; Gaidan, I.

doi:10.1016/j.mseb.2004.12.061

Cited by 183 publications

(79 citation statements)

References 31 publications

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“…However, the sensitivity of the ZnO material is not sufficiently high 3,4 . Because of the high activation energy of reaction with gas molecules, high temperature (300°C-400°C) is applied for the ZnO gas sensor to get higher response [5][6][7] . However, high temperature not only leads to high power consumption but also ignites the flammable and explosive gases 8 .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

et al. 2014

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Pure ZnO and 5at%, 7at%, 9at% Sn-doped ZnO materials are prepared by the chemical coprecipitation method. They were annealed by furnace at temperature range of 300-700°C in air for 1h. The ZnO materials are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Sn-doped ZnO materials appear rough porous structures. The maximum sensitivity can be achieved by doping the amount of 7 at%. It has much better sensing performance towards ethanol vapor under visible light irradiation. The response and recovery time are ~1s and ~5s, respectively. The mechanism for the improvement in the sensing properties can be explained with the surface adsorption theory and the photoactivation theory.

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Section: Introductionmentioning

confidence: 99%

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

et al. 2014

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“…It is known that electrical resistance for n-type semiconductors decreases, but for p-type it increases when reducing gas reacts with oxygen species absorbed on the grain surface [25]. By interaction with reducing gas, the oxygen …”

Section: Discussionmentioning

confidence: 99%

“…In the same time, the obtained response and recovery time are longer than those of the literature values [18] due to the bulk nature of the sensor element. As we can see, resistance for stoichiometric Ni-Zn ferrite increases, but for excess-iron Ni-Zn ferrite it decreases, attributed to different type of charge carriers.It is known that electrical resistance for n-type semiconductors decreases, but for p-type it increases when reducing gas reacts with oxygen species absorbed on the grain surface [25]. By interaction with reducing gas, the oxygen …”

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confidence: 99%

Gas sensitivity of stoichiometric and excess-iron Ni-Zn ferrite prepared by sol-gel auto-combustion

Šutka¹,

Mežinskis²,

Strīķis³

et al. 2012

Energetika

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Application of new materials offers more sensitive, selective and long-term stable sensor materials. The aim of the present work is to compare gas response to acetone of nanostructured sol-gel auto-combustion derived stoichiometric and excess-iron cubic spinel type nickel-zinc ferrite (Ni 0.3 Zn 0.7 Fe 2+z O 4 where z = 0 and 0.1). Detailed synthesis steps and gas sensing measurement methodology were described. The sensor material was characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and direct current (DC) resistance measurements. XRD analysis confirms that samples form the single-phased cubic spinel structure, SEM reveals nanosized grains less than 100 nm in diameter. Plots of resistance versus temperature show adsorbed water contribution to the conductance. With excess-iron, Ni-Zn ferrite changes its DC electrical resistivity, type of conductivity, as well as response to reducing gas (more than 2 times). Obtained relationships can be explained with Fe 2+ formation in the material, thus increasing charge carrier (electron) concentration. This leads down to higher oxygen adsorption ability which can act with test gas.Key words: nickel-zinc ferrite, non-stoichiometry, gas sensor, combustion synthesis [2][3][4][5][6][7]. At the same time information about ferrite gas sensors in comparison with single metal oxide gas sensors is still limited and does not contain data about gas sensing properties of complex or non-stoichiometric iron deficient or excess-iron spinel ferrite compounds, which have essentially different electrical properties. INTRODUCTIONThe conductivity in spinel ferrites is due to hopping of charge carriers (electrons or holes) between cations presented by more than one valence state occupying the octahedral sites [8]. Zinc or cadmium ions show strong affinity to the tetrahedral site, but iron, nickel, manganese, and cobalt ions, for example, show tendency to occupy octahedral sites. Electron hopping between Fe 3+ and Fe 2+ provides ntype, but hole hopping between Ni 3+ ↔ Ni 2+ , Mn 3+ ↔ Mn 2+ , Co 3+ ↔ Co 2+ provides p-type conductivity.The gas sensitivity of metal oxide semiconductor sensors is highly affected by their electric and transport properties [9]. In our previous works, influence of zinc ion concentration on resistance and sensitivity of p-type nickel ferrite [10], as well as iron ion non-stoichiometry effect on resistance and sensitivity of n-type zinc ferrite [11] were investigated. It was found that with zinc addition to nickel ferrite, response to different VOCs decreases, attributed to extinguishing p-type charge carriers (holes) and carrying a small amount of dopants in the semiconductor 167 Gas sensitivity of stoichiometric and excess-iron Ni-Zn ferrite prepared by sol-gel auto-combustion structure. This was confirmed with change of conductivity type by increasing temperature. In case of zinc ferrite response increased by going from iron deficiency to excess due to an increase of Fe 2+ concentration, the charge carrier (electron) concentration increased,...

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“…Parameters like composition, method of synthesis, substitution of different cations, annealing time and temperature, sintered density, porosity and crystallite size alter the properties of material [10][11] . Ferrites materials are comparatively economical for preparation of various types of sensors to probe, such as magnetic field 12 , current 13 , gas concentrations [14][15] , heat treatment 16 and mechanical stresses 17 , and. Ferrite temperature sensors used in biochemical applications [18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Influence of pH Variation on Structural and Magnetic Properties of Ni-Zn Ferrite Nanoparticles Synthesized by Auto Combustion Method

Tyagi¹,

Ahlawat²

2017

Orient. J. Chem

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Nickel zinc ferrite (Ni 0.5 Zn 0.5 Fe 2 O 4 ) nanoparticles were synthesized via solution auto ignition combustion method. The ferrite samples were synthesized with different pH values 3, 5, 7 and 8. The as synthesized samples were calcined at 800 o C for 4 hours. These synthesized nanopowder have been characterized by XRD, SEM and VSM and effect of pH value on the properties of the ferrite samples were studied. XRD pattern confirmed that samples were crystalline in nature. Crystallite size of ferrite powder increased with increase in basic nature of ferrite nanopaticles. Crystallite size of sample was found 24.86nm, 28.10nm, 33.51nm and 39.61nm at pH values 3, 5, 7 and 8 respectively. The magnetization of samples prepared at different pH values 3, 5, 7 and 8 were found 55.490e.m.u./g, 61.420e.m.u./g, 65.541e.m.u./g and 66.512e.m.u./g respectively.

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Development of a novel gas sensor based on oxide thick films

Cited by 183 publications

References 31 publications

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

Gas sensitivity of stoichiometric and excess-iron Ni-Zn ferrite prepared by sol-gel auto-combustion

Influence of pH Variation on Structural and Magnetic Properties of Ni-Zn Ferrite Nanoparticles Synthesized by Auto Combustion Method

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