Ultrasensitive NO2 gas sensor based on Sb-doped SnO2 covered ZnO nano-heterojunction

Wang, Zhaohua; Zhi, Mingfeng; Xu, Manzhang; Guo, Chen; Man, Zhenwu; Zhang, Zhiyong; Li, Qiang; Liu, Yuanyuan; Zhao, Wenguang; Yan, Junfeng; Zhai, Chunxue

doi:10.1007/s10853-020-05737-6

Cited by 21 publications

(11 citation statements)

References 27 publications

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“…Nanocomposite materials based on SnO 2 are obtained by various methods [22], such as magnetron sputtering methods [25], chemical technologies [26][27][28], atomic layer deposition [29], the microwave hydrothermal method [30,31], magnetron sputtering [32], spray [33][34][35] or solid-phase [36,37] pyrolysis, etc. During the preparation of this article, the authors analyzed the available publications devoted to the study of the gas-sensitive and physicochemical properties of composite materials based on SnO 2 with a small concentration of ZnO.…”

Section: Introductionmentioning

confidence: 99%

High Gas Sensitivity to Nitrogen Dioxide of Nanocomposite ZnO-SnO2 Films Activated by a Surface Electric Field

et al. 2022

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Gas sensors based on the multi-sensor platform MSP 632, with thin nanocomposite films based on tin dioxide with a low content of zinc oxide (0.5–5 mol.%), were synthesized using a solid-phase low-temperature pyrolysis technique. The resulting gas-sensitive ZnO-SnO2 films were comprehensively studied by atomic force microscopy, Kelvin probe force microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy. The obtained films are up to 200 nm thick and consist of ZnO-SnO2 nanocomposites, with ZnO and SnO2 crystallite sizes of 4–30 nm. Measurements of ZnO-SnO2 films containing 0.5 mol.% ZnO showed the existence of large values of surface potential, up to 1800 mV, leading to the formation of a strong surface electric field with a strength of up to 2 × 107 V/cm. The presence of a strong surface electric field leads to the best gas-sensitive properties: the sensor’s responsivity is between two and nine times higher than that of sensors based on ZnO-SnO2 films of other compositions. A study of characteristics sensitive to NO2 (0.1–50 ppm) showed that gas sensors based on the ZnO-SnO2 film demonstrated a high sensitivity to NO2 with a concentration of 0.1 ppm at an operating temperature of 200 °C.

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Section: Introductionmentioning

confidence: 99%

High Gas Sensitivity to Nitrogen Dioxide of Nanocomposite ZnO-SnO2 Films Activated by a Surface Electric Field

et al. 2022

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“…For instance, the structure and electronic structure can be manipulated easily due to the highly tunable valence state and oxygen vacancy defects (OVs) [15,16]. Therefore, SnO 2 is considered a potential material in various technological fields such as catalysis, optoelectronic devices, rechargeable lithium batteries, electrocatalysis, photocatalysis, solar energy conversion, and gas sensing [17][18][19][20][21][22][23][24]. In the catalytic area, SnO 2 is an emerging material for removing contaminants such as organic dyes, phenolic compounds, and volatile organic compounds (VOCs) due to strongly oxidizing properties thanks to flexible energy band structure, rich defects, good chemical, and high thermal stability, and easily controlled morphology [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Tin dioxide nanomaterial-based photocatalysts for nitrogen oxide oxidation: a review

Pham¹,

Tran²,

Truong³

et al. 2022

Beilstein J. Nanotechnol.

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Semiconducting SnO2 photocatalyst nanomaterials are extensively used in energy and environmental research because of their outstanding physical and chemical properties. In recent years, nitrogen oxide (NOx) pollutants have received particular attention from the scientific community. The photocatalytic NOx oxidation will be an important contribution to mitigate climate change in the future. Existing review papers mainly focus on applying SnO2 materials for photocatalytic oxidation of pollutants in the water, while studies on the decomposition of gas pollutants are still being developed. In addition, previous studies have shown that the photocatalytic activity regarding NOx decomposition of SnO2 and other materials depends on many factors, such as physical structure and band energies, surface and defect states, and morphology. Recent studies have been focused on the modification of properties of SnO2 to increase the photocatalytic efficiency of SnO2, including bandgap engineering, defect regulation, surface engineering, heterojunction construction, and using co-catalysts, which will be thoroughly highlighted in this review.

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“…However, it is extremely hard to find out the mechanisms of how the morphologies changing affects the sensing properties, and the nanostructures of the materials seem extremely difficult to be designed and predicted. A heterojunction structure can be created by compositing semiconductor materials with different Fermi levels, which can cause higher sensitivity and selectivity by adjusting the electron structures [ 21 , 22 , 23 ]. 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.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Sensing Performance of Highly Doped Sb/SnO2

Feng

Gaiardo

Valt

et al. 2022

Sensors

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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.

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Ultrasensitive NO2 gas sensor based on Sb-doped SnO2 covered ZnO nano-heterojunction

Cited by 21 publications

References 27 publications

High Gas Sensitivity to Nitrogen Dioxide of Nanocomposite ZnO-SnO2 Films Activated by a Surface Electric Field

High Gas Sensitivity to Nitrogen Dioxide of Nanocomposite ZnO-SnO2 Films Activated by a Surface Electric Field

Tin dioxide nanomaterial-based photocatalysts for nitrogen oxide oxidation: a review

Investigation on Sensing Performance of Highly Doped Sb/SnO2

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