Efficient H2 gas sensor based on 2D SnO2 disks: Experimental and theoretical studies

Ammar, H.Y.; Kumar, Rajesh; Almas, Tubia; Ibrahim, Ahmed A.; Al-Assiri, M.S.; Abaker, M.; Baskoutas, Sotirios

doi:10.1016/j.ijhydene.2019.04.269

Cited by 68 publications

(12 citation statements)

References 90 publications

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“…STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pd-decorated and Co-doped SnO 2 , 50 − 52 WO 3 , 53 CuO, 54 WO 3 –CuO junction, 53 ZnO, and Ag-doped ZnO. 55 Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works.…”

Section: Resultsmentioning

confidence: 74%

“…STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pd-decorated and Co-doped SnO 2 , − WO 3 , CuO, WO 3 –CuO junction, ZnO, and Ag-doped ZnO . Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works. , As far as our knowledge is concerned, the best experimental result regarding H 2 sensing was obtained by Wang et al, recording a LOD of 0.25 ppm at R air / R gas = 3.…”

Section: Resultsmentioning

confidence: 79%

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Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

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Hydrogen is largely adopted in industrial processes and is one of the leading options for storing renewable energy. Due to its high explosivity, detection of H 2 has become essential for safety in industries, storage, and transportation. This work aims to design a sensing film for high-sensitivity H 2 detection. Chemoresistive gas sensors have extensively been studied for H 2 monitoring due to their good sensitivity and low cost. However, further research and development are still needed for a reliable H 2 detection at sub-ppm concentrations. Metal-oxide solid solutions represent a valuable approach for tuning the sensing properties by modifying their composition, morphology, and structure. The work started from a solid solution of Sn and Ti oxides, which is known to exhibit high sensitivity toward H 2 . Such a solid solution was empowered by the addition of Nb, which—according to earlier studies on titania films—was expected to inhibit grain growth at high temperatures, to reduce the film resistance and to impact the sensor selectivity and sensitivity. Powders were synthesized through the sol–gel technique by keeping the Sn–Ti ratio constant at the optimal value for H 2 detection with different Nb concentrations (1.5–5 atom %). Such solid solutions were thermally treated at 650 and 850 °C. The sensor based on the solid solution calcined at 650 °C and with the lowest content of Nb exhibited an extremely high sensitivity toward H 2 , paving the way for H 2 ppb detection. For comparison, the response to 50 ppm of H 2 was increased 6 times vs SnO 2 and twice that of (Sn,Ti) x O 2 .

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 79%

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

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“…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. For instance, a slew of remarkable research works is devoted to synthesizing SnO 2 with various nano-morphologies, such as nanowires [ 9 ], nanoflower [ 10 , 11 ], nanofibers [ 12 ], nano hollow [ 13 ], 2D flakes [ 14 ], nanosphere [ 15 , 16 ], 3D mesoporous [ 17 ], hollow sphere [ 18 ], and 3D microporous spheres [ 19 , 20 ]. 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.…”

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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“…The researchers have been interested in metal oxide semiconductors due to their unique physical and chemical properties, these properties are increased and improved by doping other ingredients [4][5][6] . It is like these oxides:( (ZnO, TiO 2 , WO 3 , CeO 3 and SnO 2 etc 7,8 Tin oxide is an important material because it has a high degree of transparency in the visible spectrum. It has a strong chemical and physical interaction with absorbent species.…”

Section: Introductionmentioning

confidence: 99%

Preparation and study of the Structural, Morphological and Optical properties of pure Tin Oxide Nanoparticle doped with Cu

Shaker

Abass

Ulwall³

2022

Baghdad Sci.J

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In this study, pure SnO2 Nanoparticles doped with Cu were synthesized by a chemical precipitation method. Using SnCl2.2H2O, CuCl2.2H2O as raw materials, the materials were annealed at 550°C for 3 hours in order to improve crystallization. The XRD results showed that the samples crystallized in the tetragonal rutile type SnO2 stage. As the average SnO2 crystal size is pure 9nm and varies with the change of Cu doping (0.5%, 1%, 1.5%, 2%, 2.5%, 3%),( 8.35, 8.36, 8.67, 9 ,7, 8.86)nm respectively an increase in crystal size to 2.5% decreases at this rate and that the crystal of SnO2 does not change with the introduction of Cu, and SEM results of the pure and doped confirmed that the particle size is within the range (25-56)nm within the nanosize. UV-Vis studies of reflection spectroscopy revealed that energy of band gap increased with increasing doping ratios (4.33,4.18 ,4.21, 4.21 4.23,4.35) ev For pure and doped with Cu (0.5%, 1%, 1.5%, 2%, 2.5%, 3%) respectively. Results of AFM show roughness rate, SPM and grain size of pure samples doped with Cu where the roughness rate of SnO2 is (3.04, 25,27,16,41.8,23.6,25.2) nm and average diameter is (98.9, 72.56 ,92.91, 88.38, 76.79, 70.94, 71.21) nm for pure and doped with Copper (0.5%, 1%, 1.5%, 2%, 2.5%, 3%) respectively.

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Efficient H2 gas sensor based on 2D SnO2 disks: Experimental and theoretical studies

Cited by 68 publications

References 90 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Investigation on Sensing Performance of Highly Doped Sb/SnO2

Preparation and study of the Structural, Morphological and Optical properties of pure Tin Oxide Nanoparticle doped with Cu

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Efficient H2 gas sensor based on 2D SnO2 disks: Experimental and theoretical studies

Cited by 68 publications

References 90 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Investigation on Sensing Performance of Highly Doped Sb/SnO2

Preparation and study of the Structural, Morphological and Optical properties of pure Tin Oxide Nanoparticle doped with Cu

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Product

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Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection