Ultra-selective tin oxide-based chemiresistive gas sensor employing signal transform and machine learning techniques

Acharyya, Snehanjan; Nag, Sayan; Guha, Prasanta Kumar

doi:10.1016/j.aca.2022.339996

Cited by 29 publications

(15 citation statements)

References 45 publications

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“…Tin oxide [ 32 , 33 , 34 ] as a semiconductor metal oxide has revealed great potential in the field of gas sensing due to its porous structure and reduced size. Especially for tin oxide and its composites, their inherent properties, such as high surface areas and unique semiconducting properties with tunable band gaps, make them compelling for sensing applications [ 35 , 36 , 37 , 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

Kononova

Мошников

Kononov

2023

Gels

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Porous nanocomposites using two (tin dioxide–silica dioxide) and three (tin dioxide–indium oxide-silica dioxide)-component systems for gas sensors were created with the sol–gel method. To understand some of the physical–chemical processes that occurred during the adsorption of gas molecules on the surface of the produced nanostructures, two models—the Langmuir model and the Brunauer–Emmett–Teller theory—were used to carry out calculations. The results of the phase analysis concerning the interaction between the components during the formation of the nanostructures were obtained through the use of X-ray diffraction, thermogravimetric analysis, the Brunauer–Emmett–Teller technique (to determine the surface areas), the method of partial pressure diagrams in a wide range of temperatures and pressures and the results of the measurement of the nanocomposites’ sensitivity. The analysis allowed us to find the optimal temperature for annealing nanocomposites. The introduction of a semiconductor additive into a two-component system based on tin and silica dioxides significantly increased the sensitivity of the nanostructured layers to reductional reagent gases.

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Section: Introductionmentioning

confidence: 99%

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

Kononova

Мошников

Kononov

2023

Gels

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“…Over the years, gas sensors based on semiconducting metal oxides (such as SnO 2 , ZnO, TiO 2 , In 2 O 3 , WO 3 ) have been popularly used due to their fascinating features like high sensitivity, low cost, ease of production, and many more. − These binary metal oxides are widely accepted among researchers due to their continued success. − In addition, a few ternary metal oxides with characteristic lattice arrangements, namely, perovskite and spinel, have drawn significant attention due to their investigated properties. − These complex oxides can allow a large number of ion substitutions, which might facilitate significant change in carrier concentrations, band gap, etc. while keeping the crystal structure unaltered …”

Section: Introductionmentioning

confidence: 99%

Hierarchical Zinc Stannate Nanoneedle-Based Sensitive Detection of Formaldehyde

Acharyya

Guha

2023

ACS Appl. Electron. Mater.

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Perovskite-type ternary metal oxides have persisted as an area of research toward developing interesting nanostructures and their subsequent application. The paper presents a nanodimensional needle-like hierarchical structure of zinc stannate (ZnSnO 3 ) material for the sensitive detection of formaldehyde. The nanomaterial was successfully synthesized through a simple and low-cost hydrothermal process. The morphology and structural properties were validated through various material characterization techniques. The nanoneedles were formed with a definite shape having an average thickness and a length of 20 and 450 nm, respectively, along with high crystallinity. Additionally, the evolution process of the grown nanostructure was discussed considering the involved chemical reactions. The gas-sensing behavior was investigated, where the maximum response was found toward formaldehyde with admirable sensitivity, fast kinetics, complete reversibility, and good selectivity and reproducibility. The limit of detection was found to be 717 ppb using the power law theory of semiconducting gas sensors. The sensing mechanism was explained using adsorption theory and the corresponding electron depletion layer modulation. The reported results indicate the potential influence of the prepared ZnSnO 3 nanoneedles toward efficient integration in various electrochemical applications.

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“…Ammonia is a colorless, flammable, corrosive, toxic, and irritating harmful gas with a permissible exposure limit of 0.2–0.5 ppm in our environment. − As a typical air pollutant, ammonia mainly comes from industrial/automobile exhaust emissions and biomass/fossil fuel combustion . Human exhales also contain trace amounts of ammonia and thus excessive ammonia is considered an important indicator of kidney disease. − Therefore, the development of efficient ammonia sensors is essential and significant for environmental monitoring, medical diagnosis, and safety inspection. , Metal oxides such as ZnO, SnO 2 , WO 3 , In 2 O 3 , TiO 2 , and Fe 2 O 3 have been widely used in chemiresistive gas sensors due to their low cost, high response, and good stability. − Although great progress has been achieved, high operating temperature and low detection limit still restrict their practical applications. − Based on the principle of chemiresistive gas sensors, two effective methods of composite engineering and light excitation have been developed to promote carrier separation and improve sensor performance. − …”

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confidence: 99%

Room-Temperature Optoelectronic Gas Sensor Based on Core–Shell g-C₃N₄@WO₃ Heterocomposites for Efficient Ammonia Detection

et al. 2023

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The ever-growing modern industry promotes the evolution of gas sensors for environmental monitoring and safety inspection. However, traditional chemiresistive gas sensors still suffer from drawbacks of high power consumption and detection limit, mainly due to the insufficient charge-transfer ability of gas-sensing materials. Here, an optoelectronic gas sensor that can detect ppb-level ammonia at room temperature is constructed based on core–shell g-C3N4@WO3 heterocomposites. The growth of WO3 nanosheets on graphitic g-C3N4 nanosheets was precisely controlled, achieving well-defined g-C3N4@WO3 core–shell architectures. Based on the synergism between light activation and the amplification effect of in situ-formed heterojunctions, the g-C3N4@WO3 sensor exhibits improved sensing characteristics for reliable ammonia detection. As compared with the pristine g-C3N4 sensor, the sensor response toward ammonia is enhanced 21 times and the detection limit is reduced from 308 to 108 ppb. This work provides a successful approach for the in situ formation of core–shell g-C3N4@WO3 interfacial composites and offers an easy solution for the rational design of advanced optoelectronic gas sensors.

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Ultra-selective tin oxide-based chemiresistive gas sensor employing signal transform and machine learning techniques

Cited by 29 publications

References 45 publications

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

Hierarchical Zinc Stannate Nanoneedle-Based Sensitive Detection of Formaldehyde

Room-Temperature Optoelectronic Gas Sensor Based on Core–Shell g-C₃N₄@WO₃ Heterocomposites for Efficient Ammonia Detection

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Ultra-selective tin oxide-based chemiresistive gas sensor employing signal transform and machine learning techniques

Cited by 29 publications

References 45 publications

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application

Hierarchical Zinc Stannate Nanoneedle-Based Sensitive Detection of Formaldehyde

Room-Temperature Optoelectronic Gas Sensor Based on Core–Shell g-C3N4@WO3 Heterocomposites for Efficient Ammonia Detection

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Room-Temperature Optoelectronic Gas Sensor Based on Core–Shell g-C₃N₄@WO₃ Heterocomposites for Efficient Ammonia Detection