High-sensitivity and high-selectivity detection of methanol based on La-doped SnO2 sensor

Chen, Yu; Dong, Zhao; Xue, Xinxin; Song, Chen; Natan, Avi; Lv, Ying; Chen, Cheng; Yang, Yinye; Cen, Weifu; Yang, Yang

doi:10.1007/s00339-020-03478-6

Cited by 19 publications

(7 citation statements)

References 46 publications

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“…It should be noted that the doping of the crystal sensitive SnO 2 layer by La 3+ ions not only increases the basicity of the La-SnO 2 layer but also increases the concentration of oxygen vacancies [64], which, as already noted, chemisorb oxygen with the formation of active oxygen centers. Thus, the sharp increase in the sensory effect when detecting alcohols and aldehydes by SnO 2 nanocrystals doped with La 3+ ions is the result of the combined action of acid-base and oxidizing factors, which especially strongly increase the sensitivity of this system to formaldehyde [40].…”

Section: Role Of Increasing the Concentration Of Oxygen Vacancies In Dopingsupporting

confidence: 56%

“…The ratio between the amounts of ethylene and acetaldehyde formed during the catalytic decomposition of alcohol on the surface of nanocrystals, and hence the sensory effect, depend on the acid-base properties of the sensitive layer. These properties can be purposefully changed by doping nanocrystals with metal ions of various electronic structures [62][63][64].…”

Section: Role Of Changes In Adsorption Properties During Dopingmentioning

confidence: 99%

“…Enrichment of the surface layers of a nanocrystalline sensor with doping elements with an increase in their volume concentration (for substitutional solutions of Mn in In 2 O 3 over 5%) stimulates the segregation of these elements on the surface of nanocrystals [63]. This prevents the interaction of oxygen and the detected gas with the surface of the sensitive layer and reduces the sensory effect [64]. This circumstance may be another reason for the drop in the sensitivity of the metal oxide sensor, which is mentioned above and is typical for many systems, with an increase in the concentration of doping elements.…”

Section: Effect Of the Position Of Doping Ions In The Crystal Latticementioning

confidence: 99%

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Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Герасимов

Громов

Иким

et al. 2021

Russ. J. Phys. Chem. B

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The relationship between the structure and properties of nanoscale conductometric sensors based on binary mixtures of metal oxides in the detection of reducing gases in the environment is considered. The sensory effect in such systems is determined by the chemisorption of oxygen molecules and the detected gas on the surface of metal oxide catalytically active particles, the transfer of the reaction products to electron-rich nanoparticles, and subsequent reactions. Particular attention is paid to the doping of nanoparticles of the sensitive layer. In particular, the effect of doping on the concentration of oxygen vacancies, the activity of oxygen centers, and the adsorption properties of nanoparticles is discussed. In addition, the role of heterogeneous contacts is analyzed.

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Section: Role Of Increasing the Concentration Of Oxygen Vacancies In Dopingsupporting

confidence: 56%

Section: Role Of Changes In Adsorption Properties During Dopingmentioning

confidence: 99%

Section: Effect Of the Position Of Doping Ions In The Crystal Latticementioning

confidence: 99%

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Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Герасимов

Громов

Иким

et al. 2021

Russ. J. Phys. Chem. B

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“…For resistance type gas sensor, when it comes into contact with the target gas, it will cause a change in resistance, so as to achieve the effect of gas detection. Under normal circumstances, the two-terminal chemiresistors type gas sensor has good gas sensitivity in high temperature environments (150 °C-350 °C) [17][18][19][20][21]. For example, the unique nano-spindle like In 2 O 3 layered structure gas sensor has a response value of 27 at 240 °C to methanol gas concentration of 100 ppm; The response of Ce-doped In 2 O 3 porous nanospheres to 100 ppm methanol at 320 °C shows that the response value is about 35.2; When exposed to 75 ppm methanol at 220 °C, the sensor response value of the La-doped SnO 2 nanocomposite with a concentration of 5 wt.…”

Section: Introductionmentioning

confidence: 99%

Mg-doped InSnO nanofiber field-effect transistor for methanol gas detection at room temperature

et al. 2022

Nanotechnology

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Research on high-performance gas sensors for detecting toxic and harmful methanol gas is still a very important issue. For gas sensors, it is very important to be able to achieve low concentration detection at room temperature. In this work, we used the electrospinning method to prepare Mg-doped InSnO nanofiber field-effect transistors (FETs) methanol gas sensor. When the Mg element doping concentration is 2.3 mol.%, InSnO nanofiber FET exhibits excellent electrical properties, including higher mobility of 3.17 cm2 V−1 s−1, threshold voltage of 1.51 V, subthreshold swing of 0.42 V/decade, the excellent on/off current ratio is about 108 and the positive bias stress stability of the InSnO nanofiber FET through Mg doping has been greatly improved. In addition, the InSnMgO nanofiber FET gas sensor exhibits acceptable gas selectivity and sensitivity to methanol gas at room temperature. In the methanol gas sensor test at room temperature, when the methanol gas concentration is 60 ppm at room temperature, the response value of the InSnMgO nanofiber FET gas sensor is 81.92; and when the methanol concentration is 5 ppm, the response value is still 1.21. This work provides an effective and novel way to build a gas sensor at room temperature and use it to detect methanol gas at room temperature.

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“…Similar to Li’s study, the lanthanum-doped SnO 2 nanocomposite was coated on a ceramic tube, and MeOH vapor was measured by changes in the resistance. The sensor output was improved by a factor of 7 with the lanthanum-doped SnO 2 compared to the sensor with only SnO 2 when measuring 75 ppm MeOH vapor at the operating temperature of 220 °C [ 31 ]. A MeOH gas sensor employing metal-organic framework was reported by Andrés et al [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Biochemical Methanol Gas Sensor (MeOH Bio-Sniffer) for Non-Invasive Assessment of Intestinal Flora from Breath Methanol

Toma

Iwasaki

Zhang

et al. 2021

Sensors

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Methanol (MeOH) in exhaled breath has potential for non-invasive assessment of intestinal flora. In this study, we have developed a biochemical gas sensor (bio-sniffer) for MeOH in the gas phase using fluorometry and a cascade reaction with two enzymes, alcohol oxidase (AOD) and formaldehyde dehydrogenase (FALDH). In the cascade reaction, oxidation of MeOH was initially catalyzed by AOD to produce formaldehyde, and then this formaldehyde was successively oxidized via FALDH catalysis together with reduction of oxidized form of β-nicotinamide adenine dinucleotide (NAD+). As a result of the cascade reaction, reduced form of NAD (NADH) was produced, and MeOH vapor was measured by detecting autofluorescence of NADH. In the development of the MeOH bio-sniffer, three conditions were optimized: selecting a suitable FALDH for better discrimination of MeOH from ethanol in the cascade reaction; buffer pH that maximizes the cascade reaction; and materials and methods to prevent leaking of NAD+ solution from an AOD-FALDH membrane. The dynamic range of the constructed MeOH bio-sniffer was 0.32–20 ppm, which encompassed the MeOH concentration in exhaled breath of healthy people. The measurement of exhaled breath of a healthy subject showed a similar sensorgram to the standard MeOH vapor. These results suggest that the MeOH bio-sniffer exploiting the cascade reaction will become a powerful tool for the non-invasive intestinal flora testing.

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High-sensitivity and high-selectivity detection of methanol based on La-doped SnO2 sensor

Cited by 19 publications

References 46 publications

Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Mg-doped InSnO nanofiber field-effect transistor for methanol gas detection at room temperature

Biochemical Methanol Gas Sensor (MeOH Bio-Sniffer) for Non-Invasive Assessment of Intestinal Flora from Breath Methanol

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