Comparison of classical and fluctuation-enhanced gas sensing with PdxWO3 nanoparticle films

Ederth, J.; Smulko, Janusz; Kish, László B.; Heszler, Péter; Granqvist, Claes G.

doi:10.1016/j.snb.2005.03.009

Cited by 63 publications

(54 citation statements)

References 18 publications

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“…Another approach is the modulation of the sensor measurement principle. For example, measuring voltage fluctuations instead of DC-resistance of nanocrystalline PdxWO3-based sensors was shown to be hundreds of times more sensitive to the presence of ethanol vapor [5]. In environmental applications there is the need to selectively detect traces of reducing gases mixed in air, e.g., to discriminate toxic, fire alarming gases, food quality indicators, disease markers, etc.…”

Section: Open Accessmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

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Section: Open Accessmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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“…Work of this kind has been reported by Reyes et al [55] and Solis et al [60 y 61]. Recent data on Pd-doped nano-crystalline WO 3 films made by AGD showed that the fluctuations (i.e., the stochastic signal) were capable of yielding a 300 times larger sensitivity for ethanol detection than the classical resistance measurement [48]. These aspects of gas sensing fall outside the scope of this article, though.…”

Section: Gas Sensing Using Temperature-modulationmentioning

confidence: 82%

“…Figure 6 illustrates an AGD unit in which the particles-formed in a laminar gas flow in the lower chamber-are transferred to the upper vacuum chamber via a tube ending with a nozzle and allowing deposition of uniformly sized particles onto a substrate that can be moved in different directions so that particulate layers are formed. Doped and mixed oxide films can be produced analogously using AGD with two vapor sources having individual transfer pipes [48].…”

Section: Nanoparticle Depositionmentioning

confidence: 99%

Nanomateriales para buenos ambientes interiores: electrocromías, sensores y fotocatalizadores

Granqvist

2012

TEC

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“…However, this high sensitivity is mainly based on a high operating temperature, which is realized with a heated filament. Ederth, et al showed that the sensitivity of the gas sensor can be significantly improved by measuring the fluctuation enhanced (stochastic) signal, instead of the dc resistance [15].…”

Section: Introductionmentioning

confidence: 99%

Very Sensitive Optical System with the Concentration and Decomposition Unit for Explosive Trace Detection

Zakrzewska¹

2015

Metrology and Measurement Systems

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The vapour pressure of most explosives is very low. Therefore, the explosive trace detection is very difficult. To overcome the problem, concentration units can be applied. At the Institute of Optoelectronics MUT, an explosive vapour concentration and decomposition unit to operate with an optoelectronic sensor of nitrogen dioxide has been developed. This unit provides an adsorption of explosive vapours from the analysed air and then their thermal decomposition. The thermal decomposition is mainly a chemical reaction, which consists in breaking up compounds into two or more simple compounds or elements. During the heating process most explosive particles, based on nitro aromatics and alkyl nitrate, release NO2 molecules and other products of pyrolysis. In this paper, the most common methods for the NO2 detection were presented. Also, an application of the concentration and decomposition unit in the NO2 optoelectronic sensor has been discussed.

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Comparison of classical and fluctuation-enhanced gas sensing with PdxWO3 nanoparticle films

Cited by 63 publications

References 18 publications

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Nanomateriales para buenos ambientes interiores: electrocromías, sensores y fotocatalizadores

Very Sensitive Optical System with the Concentration and Decomposition Unit for Explosive Trace Detection

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