A computer-aided setup for gas-sensing measurements of sensors based on semiconductor nanocomposites

Gracheva, I. E.; Maksimov, A. I.; Мошников, В. А.; Plekh, M.

doi:10.1134/s0020441208030251

Cited by 26 publications

(5 citation statements)

References 1 publication

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“…The different sensing junction structures were tested by the means of a novel experimental setup specially designed for checking the temperature dependence of the potential difference of the different junction structures in the air and the changes in the value of the potential difference when these structures are exposed to mixture of vapor of ethanol vapor with dry air flow [16]. To be able to calculate the concentration of ethanol into the quartz tube (where the sample was placed), it was necessary to take the vapor pressure of the ethanol in that condition into account (the temperature in the laboratory and atmospheric pressure).…”

Section: Methodsmentioning

confidence: 99%

Investigation of Gas-Sensitive Properties of Thin-Film Thermovoltaic Sensor Elements Based on Zinc Oxide

et al. 2019

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Systematic research on a new type of gas sensor devices based on the thermovoltaic effect in zinc oxide, inhomogeneously doped with impurities of variable valence, is presented in the article. The ZnO-ZnO-Me two-layer sandwich structure, in which the thermovoltaic effect is observed, is synthesized using sol-gel technology from sols by dissolving the inorganic zinc salt in alcohol and adding a surfactant, followed by the mixing and maturation of the sol. The lower layer of the nanostructure is formed from pure zinc oxide by immersing the substrate at 2 /3 length in sol and drying. The upper layer of zinc oxide doped with copper or iron is formed by two or three immersions of the other end of the substrate by 2 /3 length, followed by drying and annealing. It has been established that, based on the developed sensor device, it is possible to obtain an increased response to gas-analyzers (ethanol being an example). Author Contributions: Conceptualization, I.P. and V.M.; formal analysis, I.A. and V.M.; investigation, I.P. and N.Y.; methodology, D.D.; software, A.K.; visualization, A.K.

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Section: Methodsmentioning

confidence: 99%

Investigation of Gas-Sensitive Properties of Thin-Film Thermovoltaic Sensor Elements Based on Zinc Oxide

et al. 2019

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“…Measurements of the impedance spectra were carried out in the frequency range from 1 Hz to 0.5 MHz at 300°C using an impedance meter «Z-500 P» (LTD «Elins») [20].…”

Section: Methodsmentioning

confidence: 99%

Porous silicon with embedded metal oxides for gas sensing applications

Мошников¹,

Gracheva²,

Lenshin³

et al. 2012

Journal of Non-Crystalline Solids

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“…The measurement setup is described in detail elsewhere [14]. Sensitivity to ethanol was determined in a computer controlled measurement setup described in [15]. Dry air dried was used as reference gas.…”

Section: Methodsmentioning

confidence: 99%

Metal-oxide-based nanocomposites comprising advanced gas sensing properties

Пономарева

Мошников

Glöß

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. Using the sol-gel technique, nanocomposite SiO 2 -SnO 2 thin films comprising a designed hierarchical pore structure were prepared on cost-efficient oxidized silicon substrates. These films exhibit advanced gas sensing properties both for reducing gases and oxygen due to an efficient analyte transport by mesoporores. IntroductionGas sensitivity of metal oxide gas sensors increases rapidly when the dimensions of oxide sensing materials become comparable or smaller than the typical thickness of the electron depletion layer [1]. Therefore, nanosized materials exhibit outstanding properties in sensor application, particularly low operation temperature and high sensitivity, attributed to their large surface area to volume ratio.Hierarchical structures are higher dimensional structures composed of many, lower dimensional building blocks. Because they are generally larger than the individual nanostructures, their van der Waals attraction is relatively weak. On the other hand, hierarchical microstructures provide an effective gas diffusion path via well aligned mesoporous structures without sacrificing a high surface area [2]. Consequently, they exhibit high gas sensitivity and fast gas response. Hierarchical nanostructures for gas sensors were prepared by vapour phase growth, hydrothermal or hydrothermal/solvothermal reactions [2], by electrospinning and subsequent oxygen plasma etching [3], by ultrasonic spray pyrolysis [4], by flame-spray-pyrolysis [5,6], and by pulsed laser deposition techniques [7]. Well defined hierarchical pore structures were prepared by sol-gel method in alkoxyderived silica systems [8] as well as in aluminium salt solutions [9] utilizing a phase separation mechanism as a pore forming principle. Recently, one of our laboratories has applied this approach for the fabrication of SnO 2 -SiO 2 composites comprising hierarchical macro-, meso-and micropores (according to IUPAC notation [10]). This minimises the build up of thermal stresses during sensor fabrication and, therefore, improves adhesion. Moreover, our technology is based on inexpensive precursors such as SnCl 2 and tetraethylorthosilicate (TOES). In the first case, advantages compared to alkoxides are besides the precursor costs a reduced sensitivity of the precursor to heat, moisture and light, and an improved time stability of the sol against the increase in viscosity. On the other hand, the presence of Cl -increases the gelling time. In this work, we investigate gas sensing properties of sol-gel deposited nanocrystalline SnO 2 -SiO 2 composites in relation to their microstructure and demonstrate gas sensitivities at the state-of-art level.

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A computer-aided setup for gas-sensing measurements of sensors based on semiconductor nanocomposites

Cited by 26 publications

References 1 publication

Investigation of Gas-Sensitive Properties of Thin-Film Thermovoltaic Sensor Elements Based on Zinc Oxide

Investigation of Gas-Sensitive Properties of Thin-Film Thermovoltaic Sensor Elements Based on Zinc Oxide

Porous silicon with embedded metal oxides for gas sensing applications

Metal-oxide-based nanocomposites comprising advanced gas sensing properties

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