Synthesis and characterization of hierarchical porous SnO2 for enhancing ethanol sensing properties

Zhang, Bowen; Fu, Wuyou; Li, Huayang; Fu, Xinglin; Wang, Ying; Bala, Hari; Wang, Xiaodong; Sun, Guang; Cao, Jianliang; Zhang, Zhanying

doi:10.1016/j.apsusc.2015.12.042

Cited by 60 publications

(11 citation statements)

References 33 publications

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“…Among of all metal oxide semiconductors, SnO 2 is a proper candidate for potential application in chemical sensing due to its thermal/chemical stability, good oxidation resistance with wide band gap energy of 3.6 eV. Up to now, few strategies have been adopted to improve the performance of SnO 2 sensors by introducing various dopants such as Ni, Fe and Pt [12]- [14], or by varying the experimental conditions on the SnO 2 fabrication such as [15] [16]. In this paper, the effect of Cu doping concentration on the SnO 2 sensibility is investigated that has not reported in the literature as nano-sensor.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol

Benzitouni¹,

Zaabat²,

Aicha³

et al. 2016

ANP

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Porous Cu-doped SnO 2 thin films were synthesized by the sol-gel dip-coating method for enhancing methanol sensing performance. The effect of Cu doping concentration on the SnO 2 sensibility was investigated. XRD data confirm that the fabricated SnO 2 films are polycrystalline with tetragonal rutile crystal structure. AFM and SEM micrographs confirmed the roughness and the porosity of SnO 2 surface, respectively. UV-Vis spectrum shows that SnO 2 thin films exhibit high transmittance in the visible region ∼95%. The band gap (3.80 -3.92 eV) and the optical thickness (893 -131 nm) of prepared films were calculated from transmittance data. The sensing results demonstrate that SnO 2 films have a high sensitivity and a fast response to methanol. In particular, 3% Cu-SnO 2 films have a higher sensitivity (98%), faster response (10 −2 s) and shorter recovery time (18 s) than other films.

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Section: Introductionmentioning

confidence: 99%

High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol

Benzitouni¹,

Zaabat²,

Aicha³

et al. 2016

ANP

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“…Most investigators have mainly focused and made great progress on the fabrication methods of novel hierarchical nanostructures [27][28][29][30], and their observations seem to agree with the general trend that higher sensitivity is to be expected for larger surface/volume ratio and uniform pore structure [1,5,31,32]. However, pore size and specific surface area are correlated in sensor materials with potentially opposite effect.…”

Section: Introductionmentioning

confidence: 76%

Gas Sensing Properties of Cobalt Titanate with Multiscale Pore Structure: Experiment and Simulation

Wang

Tao

et al. 2020

Sensors

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A diffusion-reaction coupled model was presented to investigate the effects of multiscale pore structure characteristics on gas sensing properties. A series of CoTiO3 powders with different pore size distributions were fabricated by sol-gel method. Experimental results on cobalt titanate thick films show that a well-defined multiscale pore structure is particularly desired for the improvement of sensing performance, instead of just increasing the specific surface area. The theoretical responses of sensing elements with different pore size distributions were derived and compared with experimental data on CoTiO3 sensors exposed to ethanol. The calculated sensitivities considering the influence of pore size changes were also found to be in agreement with the experimental results. A dimensionless Thiele modulus Th was introduced for assessing the critical point corresponding to the transformation from surface reaction-controlled sensitivity into diffusion-controlled sensitivity.

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“…When the material is exposed to ethanol (a reducing gas), the adsorbed oxygen species interacts with the ethanol molecules, forming CO 2 and H 2 O (Equations (3) and (4)), and the trapped electrons are released back towards the conduction band of the SnO 2 material. This reaction leads to a thinner depletion layer and a decrease in the material’s resistance [ 40 , 41 ].

…”

Section: Resultsmentioning

confidence: 99%

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

Annanouch

Martini-Laithier

Fiorido

et al. 2021

Sensors

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In this paper, we report the fabrication and characterization of a portable transdermal alcohol sensing device via a human finger, using tin dioxide (SnO2) chemoresistive gas sensors. Compared to conventional detectors, this non-invasive technique allowed us the continuous monitoring of alcohol with low cost and simple fabrication process. The sensing layers used in this work were fabricated by using the reactive radio frequency (RF) magnetron sputtering technique. Their structure and morphology were investigated by means of X-ray spectroscopy (XRD) and scanning electron microscopy (SEM), respectively. The results indicated that the annealing time has an important impact on the sensor sensitivity. Before performing the transdermal measurements, the sensors were exposed to a wide range of ethanol concentrations and the results displayed good responses with high sensitivity, stability, and a rapid detection time. Moreover, against high relative humidity (50% and 70%), the sensors remained resistant by showing a slight change in their gas sensing performances. A volunteer (an adult researcher from our volunteer group) drank 50 mL of tequila in order to realize the transdermal alcohol monitoring. Fifteen minutes later, the volunteer’s skin started to evacuate alcohol and the sensor resistance began to decline. Simultaneously, breath alcohol measurements were attained using a DRAGER 6820 certified breathalyzer. The results demonstrated a clear correlation between the alcohol concentration in the blood, breath, and via perspiration, which validated the embedded transdermal alcohol device reported in this work.

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Synthesis and characterization of hierarchical porous SnO2 for enhancing ethanol sensing properties

Cited by 60 publications

References 33 publications

High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol

High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol

Gas Sensing Properties of Cobalt Titanate with Multiscale Pore Structure: Experiment and Simulation

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

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Synthesis and characterization of hierarchical porous SnO2 for enhancing ethanol sensing properties

Cited by 60 publications

References 33 publications

High Sensitivity of Porous Cu-Doped SnO&lt;sub&gt;2&lt;/sub&gt; Thin Films to Methanol

High Sensitivity of Porous Cu-Doped SnO&lt;sub&gt;2&lt;/sub&gt; Thin Films to Methanol

Gas Sensing Properties of Cobalt Titanate with Multiscale Pore Structure: Experiment and Simulation

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

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High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol

High Sensitivity of Porous Cu-Doped SnO<sub>2</sub> Thin Films to Methanol