Electrical conductivity of CdS films for gas sensing: Selectivity properties to alcoholic chains

Giberti, A; Casotti, Davide; Cruciani, Giuseppe; Fabbri, Barbara; Gaiardo, Andrea; Guidi, V.; Malagù, C.; Zonta, Giulia; Gherardi, S.

doi:10.1016/j.snb.2014.10.054

Cited by 44 publications

(22 citation statements)

References 19 publications

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“…S is positive for reducing gases and negative for oxidizing gases. 11 The histogram of Fig. 7(c) shows the calculated response for SnS nanoakes for all gases at different temperature with 10 ppm xed concentration.…”

Section: Resultsmentioning

confidence: 99%

Two-dimensional SnS nanoflakes: synthesis and application to acetone and alcohol sensors

2017

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Section: Resultsmentioning

confidence: 99%

Two-dimensional SnS nanoflakes: synthesis and application to acetone and alcohol sensors

2017

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“…The additional characterizations, as reported in [ 42 ], allowed for a very high chemical purity of CdS to be obtained. The XRD analysis showed monophasic material and the peaks correspond to the cubic polymorph of Cadmium Sulfide (space group F−43 m, corresponds to β-CdS / hawleyite).…”

Section: Resultsmentioning

confidence: 99%

“…The performance of the sensing films was investigated at operating temperatures ranging between 150 °C and 300 °C for SnS 2 -based sensors, and between 150 °C and 350 °C for CdS-based sensors. Higher temperatures must be avoided with these materials because they oxidize at temperatures of 400 °C and 500 °C for SnS 2 and CdS, respectively [ 40 , 41 , 42 ]. For this reason, we decided to test these sensors at temperature fairly lower than their critical temperature.…”

Section: Methodsmentioning

confidence: 99%

Metal Sulfides as Sensing Materials for Chemoresistive Gas Sensors

Gaiardo

Fabbri

Guidi

et al. 2016

Sensors

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This work aims at a broad overview of the results obtained with metal-sulfide materials in the field of chemoresistive gas sensing. Indeed, despite the well-known electrical, optical, structural and morphological features previously described in the literature, metal sulfides present lack of investigation for gas sensing applications, a field in which the metal oxides still maintain a leading role owing to their high sensitivity, low cost, small dimensions and simple integration, in spite of the wide assortment of sensing materials. However, despite their great advantages, metal oxides have shown significant drawbacks, which have led to the search for new materials for gas sensing devices. In this work, Cadmium Sulfide and Tin (IV) Sulfide were investigated as functional materials for thick-film chemoresistive gas-sensors fabrication and they were tested both in thermo- and in photo-activation modes. Furthermore, electrical characterization was carried out in order to verify their gas sensing properties and material stability, by comparing the results obtained with metal sulfides to those obtained by using their metal-oxides counterparts. The results highlighted the possibility to use metal sulfides as a novel class of sensing materials, owing to their selectivity to specific compounds, stability, and the possibility to operate at room temperature.

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“…where G gas and G air are the conductance values in gas and in air, respectively [18]. It can be noticed, are reportated the responses to the severel gases at 250°C and 300°C in Fig.…”

Section: R = (G Gas -G Air ) / G Gasmentioning

confidence: 88%

“…Air and gases were from certified bottles, and the injection in the chamber occurred by means of a PC-driven mass-flow-controller. The conductance of the films were constantly recorded during gas measurements through proper electronics interfaced to a dataacquiring system [14]. The responses of the sensors were investigated at different operating temperatures up to 300°C.…”

Section: Gas Sensing Measurementsmentioning

confidence: 99%

Tin (IV) Sulfide chemoresistivity: A possible new gas sensing material

Gaiardo

Bellutti

Gherardi

et al. 2015

2015 XVIII AISEM Annual Conference

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In the last years, the research in the gas sensor field had a significant upward thrust. Regarding the chemoresistive gas sensors, this has produced a remarkable study of metal oxides semiconductors which, however, have shown different limits. In particular their low selectivity and lack of stability take them to an unreliable responses over time. For this reason, in this work it was decided to study the chemoresistive behavior of a non metal oxide semiconductor as Tin (IV) S ulfide (S nS 2 ). S nS 2 nanoparticles was synthetized by precipitation reaction in aqueous solution. Then, structural chemical and morphological characterizations were carried out by means of X-Ray Diffraction and S EM techniques. Furthermore, the thermal stability of the powder was studied with thermogravimetric analysis. The sensitive films were obtained by preparing a screenprinting paste and then depositing it on alumina substrates by means of screen-printing technique. The sensing properties of the obtained devices were tested with several gases at different working temperatures. At the best working temperature, a high selectivity to ketones and aldehydes, with respect to different types of molecules, was observed.

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Electrical conductivity of CdS films for gas sensing: Selectivity properties to alcoholic chains

Cited by 44 publications

References 19 publications

Two-dimensional SnS nanoflakes: synthesis and application to acetone and alcohol sensors

Two-dimensional SnS nanoflakes: synthesis and application to acetone and alcohol sensors

Metal Sulfides as Sensing Materials for Chemoresistive Gas Sensors

Tin (IV) Sulfide chemoresistivity: A possible new gas sensing material

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