Mesopororous Sn0.9−xIn0.1Cux(I)O2−δ gas sensors with selectivity to H2S working under humid air conditions

Şomăcescu, Simona; Osiceanu, Petre; Calderón-Moreno, José Maria; Sackmann, André; Simion, Cristian E.; Stănoiu, Adelina

doi:10.1016/j.micromeso.2014.06.001

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…The dominance of CuO or SnO 2 seemed to be dependent on the operating temperature. This can be attributed to the surface activity of CuO at low temperature [21], while the SnO 2 surface is much active at higher temperatures [4,5,6,8,9,10,11,12,15,16]. Thus, the sensor response decreased upon this sensing behavior, where the sensor response was positive for SnO 2 and negative for CuO.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Characterization of Developed CuxSn1−xO2 Nanocomposite and Its Promising Methane Gas Sensing Properties

Shaalan

Hamad

Aljaafari

et al. 2019

Sensors

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Novel materials with nanostructures are effective in controlling the physical properties needed for specific applications. The use of active and sensing materials is increasing in many applications, such as gas sensing. In the present work, we attempted to synthesize incorporated Cu2+ into the SnO2 matrix as CuxSn1−xO2 nanocomposite using a cost-effective precursor and method. It was observed that, at low concentrations of copper precursor, only SnO2 phase could be detected by X-ray diffraction (XRD). The distribution of Cu in the SnO2 matrix was further measured by elemental analysis of energy-dispersive X-ray (EDX) mapping and X-ray fluorescence (XRF). At high copper concentration, a separated monoclinic phase of CuO was formed (noted here as CuO/SnO2). The average crystallite size was slightly reduced from 5.9 nm to 4.7 nm with low doping of 0.00–5.00% Cu but increased up to 15.0 nm at high doping of 10.00% Cu upon the formation of separated SnO2 and CuO phases. The formation of Cu–SnO2 or CuO phases at low and high concentrations was also observed by photoluminescent spectra. Here, only the emission peak of SnO2 with a slight blueshift was recorded at low concentrations, while only the CuO emission peak was recorded at high concentration. The effect of Cu concentration on the sensing properties of SnO2 toward methane (CH4) gas was also investigated. It was found that the sensor embedded with 2.00% Cu exhibited an excellent sensitivity of 69.0 at 350 °C and a short response–recovery time compared with the other sensors reported here. The sensing mechanism of CuxSn1−xO2 and CuO/SnO2 is thus proposed based on Cu incorporation.

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Section: Resultsmentioning

confidence: 99%

“…Fateminia et al [12] reported a response toward methane with Pt–SnO 2 structure as high as 30/0.5%. Much improvement was also reported when binary, ternary, or quadrant composite-based SnO 2 were developed [13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Developed CuxSn1−xO2 Nanocomposite and Its Promising Methane Gas Sensing Properties

Shaalan

Hamad

Aljaafari

et al. 2019

Sensors

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show abstract

“…Upon the exposure CH 4 , the crystal may be transferred from a volume to regional depletion, thus, both Eqs. (14) and (15) are used. Based on these theoretical bases, the calculated sensitivity as a function of CH 4 concentration is shown in Fig.…”

Section: And Thenmentioning

confidence: 99%

“…They are multifaceted in the operating procedures and not convenient for on-site use. Several research papers studied the oxide materials for methane detection [1][2][3][4][7][8][9][10][11][12][13][14][15][16][17][18], but most of these materials show a low sensitivity toward methane at high operating temperatures. To our best knowledge, there is no theoretical approach proved the sensing mechanism of methane by oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Development of numerical analysis and methane sensing application of highly sensitive quantum crystals based on tin dioxide prepared by hydrothermal

Shaalan

Hamad

Alshoaibi

et al. 2019

J Mater Sci: Mater Electron

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The quantum size of materials is an effective property for specific physical applications. The theoretical approach helps in understanding the physical properties of these materials. SnO 2 quantum crystals of ~ 1.8-6.0 nm are prepared by a hydrothermal method. The size of crystals is smaller than the Debye length reported for SnO 2 at 250 °C. The emission spectra of the radiative recombination between conduction and valence bands show a blue shift, which confirms the electron confinement. The prepared materials are used for fabricating gas sensor tested for CH 4 gas. The gas detecting measurements exhibited high sensitive quantum crystals, QCs, toward CH 4. For the first time, a theoretical approach is formulated for the response of SnO 2 toward CH 4 to understand the sensing mechanism of the quantum crystals. The correlation between the theoretical and experimental results clarified the reason of the high response observed for the quantum crystals toward CH 4. To conduct a high response, the crystal size should be comparable or less than the Debye length, which means that the crystal is fully depleted or in volume-depleted in the air. Thus, the high response obtained here is explained in terms of the proposed theoritical approach.

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Synthesis and structural characteristics of Ag Sn1–O2 nanocomposites and their sensing performance toward methane, hydrogen, and carbon monoxide

Hamad,

Shaalan,

Abdelraheem

et al. 2024

Journal of Environmental Chemical Engineering

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Mesopororous Sn0.9−xIn0.1Cux(I)O2−δ gas sensors with selectivity to H2S working under humid air conditions

Cited by 9 publications

References 26 publications

Preparation and Characterization of Developed CuxSn1−xO2 Nanocomposite and Its Promising Methane Gas Sensing Properties

Preparation and Characterization of Developed CuxSn1−xO2 Nanocomposite and Its Promising Methane Gas Sensing Properties

Development of numerical analysis and methane sensing application of highly sensitive quantum crystals based on tin dioxide prepared by hydrothermal

Synthesis and structural characteristics of Ag Sn1–O2 nanocomposites and their sensing performance toward methane, hydrogen, and carbon monoxide

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