SnO2 nanostructured materials used as gas sensors for the detection of hazardous and flammable gases: A review

Kong, Yulin; Li, Yuxiu; Cui, Xiuxiu; Su, Linfeng; Ma, Dongying; Lai, Tingrun; Yao, Lifang; Xiao, Xuechun; Wang, Yude

doi:10.1016/j.nanoms.2021.05.006

Cited by 76 publications

(28 citation statements)

References 123 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was possible thanks to the selection of the two MOS sensors, one based on tungsten oxide, the other based on tin oxide. It is known from literature [34] that MOS sensors employing SnO2 as thin layer are responsive towards oxidable vapors, particularly alcohols. This is due to the formation of an oxygen layer in proximity with the SnO2 particles.…”

Section: Discussionmentioning

confidence: 99%

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

et al. 2022

View full text Add to dashboard Cite

In this work, a system consisting of two resistive sensors working in tandem to detect and quantify the acetic acid released during the degradation of cellulose acetate-based ancient cinematographic and photographic films is presented. Acetic acid must be constantly monitored to prevent reaching concentrations at which autocatalytic degradation processes begin. The sensors are constituted by a thin layer of metal oxide (tungsten oxide and tin oxide) deposited over an interdigitated electrode capable of being heated, chosen to maximize the array response towards acetic acid vapors. The signals obtained from the sensor array are mathematically processed to reduce the background signal due to interferent gases produced during degradation of ancient cinematographic films. The sensor array reported a LOD of 30 ppb for acetic acid, with a linearity range up to 30 ppm. Finally, the sensor array was tested with different cinematographic and photographic film samples made of cellulose acetate, whose degradation state and acetic acid production was validated using the conventional technique (A-D strips). The presented array is suitable for remote monitoring large number of films in collections since, compared to the official technique, it has a lower detection limit (30 ppb vs. 500 ppb) and is much quicker in providing accurate acetic acid concentration in the film boxes (15 min vs. 24 h).

show abstract

Section: Discussionmentioning

confidence: 99%

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

et al. 2022

View full text Add to dashboard Cite

show abstract

“…SnO 2 , with a wide band gap of about 3.6 eV at 300 K, is one of the most extensively used semiconductor materials for gas sensors due to its steady-state chemical and physical properties at various temperatures. However, drawbacks of SnO 2 -based gas sensors still need to be addressed, including high working temperature and poor selectivity [ 6 , 7 ]. Based on the sensing mechanism model [ 8 ], there are three reasonably effective strategies for increasing the sensitivity and selectivity of SnO 2 : nanostructure modification, heterojunction structure building, and noble metal elements doping.…”

Section: Introductionmentioning

confidence: 99%

“…However, the heterojunction part is so sensitive to the composite materials semiconductor properties, content ratio, and structure; hence, the sensing results are not ideally repeatable. Moreover, doping with noble elements can change the position of energy levels in the conduction band of SnO 2 , such as by doping Pd [ 24 ], Ru [ 25 ], Al [ 26 ], Pt [ 27 ], Sb [ 28 ], Ce [ 29 ], Ag [ 30 ], and Ti [ 31 ], which is a more reliable and economical way to increase the selectivity and sensitivity compared to nanostructure modification and heterojunction structure building towards the gas sensing performance optimization [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Sensing Performance of Highly Doped Sb/SnO2

Feng

Gaiardo

Valt

et al. 2022

Sensors

View full text Add to dashboard Cite

Tin dioxide (SnO2) is the most-used semiconductor for gas sensing applications. However, lack of selectivity and humidity influence limit its potential usage. Antimony (Sb) doped SnO2 showed unique electrical and chemical properties, since the introduction of Sb ions leads to the creation of a new shallow band level and of oxygen vacancies acting as donors in SnO2. Although low-doped SnO2:Sb demonstrated an improvement of the sensing performance compared to pure SnO2, there is a lack of investigation on this material. To fill this gap, we focused this work on the study of gas sensing properties of highly doped SnO2:Sb. Morphology, crystal structure and elemental composition were characterized, highlighting that Sb doping hinders SnO2 grain growth and decreases crystallinity slightly, while lattice parameters expand after the introduction of Sb ions into the SnO2 crystal. XRF and EDS confirmed the high purity of the SnO2:Sb powders, and XPS highlighted a higher Sb concentration compared to XRF and EDS results, due to a partial Sb segregation on superficial layers of Sb/SnO2. Then, the samples were exposed to different gases, highlighting a high selectivity to NO2 with a good sensitivity and a limited influence of humidity. Lastly, an interpretation of the sensing mechanism vs. NO2 was proposed.

show abstract

“…SnO2 is a strong candidate for future transistors, piezoelectric devices, and solar cells [13]. Furthermore, the high sensibility to toxic and combustible gases can be highlighted, accelerating studies on SnO2 gas sensors in different geometries, such as thin films, heterojunctions, nanoparticles, and NB [14].…”

Section: Introductionmentioning

confidence: 99%

“…The oxide NB metal functionalization, in addition to presenting economic advantages, is also a powerful way to improve the sensibility and selectivity of the NB [14]. According to Chan et al, the improvement obtained through functionalization by metallic nanoparticles can be understood from different views, such as manipulation of the acidbased properties of the NB surface, change in donor density, catalytic promotion, and extension of the electron depletion region at the junction metal-semiconductor [22].…”

Section: Introductionmentioning

confidence: 99%

Improving Hazardous Gas Detection Behavior with Palladium Decorated Sno<sub>2</sub> Nanobelts Networks

Araújo¹,

Paiva²,

Blanco³

et al. 2022

Preprint

View full text Add to dashboard Cite

When present in specific amounts in the air, the colorless, odorless, and tasteless gases monoxide and carbon dioxide may either replace oxygen in red blood cells (CO) or increase the respiratory rate causing cardiac arrhythmias (CO2), leading to death. Commercial sensors take around 8 h to detect levels of CO (50 PPM), causing moderate poisoning. SnO2 presents controlled interactions with the atmosphere using conductance and vacancy adjustments to capture electrical properties. However, the selectivity of gas detection by SnO2 can still be improved, thus also increasing the application possibilities. The present study aimed to optimize the sensing of CO and CO2 in SnO2 using palladium functionalization. The vapor-liquid-solid method synthesized a network of SnO2 nanobelts decorated with palladium nanoparticles. The sensitivity of the sensors for CO and CO2 were evaluated, characterizing parameters such as response time, a wide range of CO and CO2 concentrations, and temperature. In the seventh measurement cycle, the sensor response for different concentrations of gases in consecutive cycles showed a sensitivity of up to 125% for CO in 60 s. Furthermore, we observed increased sensor sensitivity with material doping with nanoparticles from 130 ppm to 1360 ppm in 30 seconds to CO. Conclusion: The results provide a better understanding of the sensitivity of SnO2 in palladium-decorated nanoparticles, offering insights for detecting low CO concentrations quickly. The behavior of these doped nanosensors showed us the importance of considering them as a practical possibility for detecting these gases of importance to human health.

show abstract

SnO2 nanostructured materials used as gas sensors for the detection of hazardous and flammable gases: A review

Cited by 76 publications

References 123 publications

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

Investigation on Sensing Performance of Highly Doped Sb/SnO2

Improving Hazardous Gas Detection Behavior with Palladium Decorated Sno<sub>2</sub> Nanobelts Networks

Contact Info

Product

Resources

About