Effect of Au nanoparticles on the gas sensitivity of nanosized SnO2

Ivanovskaya, M. I.; Ovodok, Evgeni; Gaevskaya, T. V.; Kotsikau, D.; Kormosh, V.; Bilanych, V. S.; Mičušík, Matej

doi:10.1016/j.matchemphys.2020.123858

Cited by 12 publications

(20 citation statements)

References 37 publications

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“…The Au nanoparticles with average diameter of several nanometers can be also seen in figure 5c. Many studies have presented that the metal‐decorated SnO 2 exhibits a higher sensing response than the pure SnO 2 [23,24] . The mechanism for the gas sensor performance enhancement from Au decoration is that: the Au particles can increase the oxygen species, and the Au particles as catalyst can cause a higher degree of electrons transport between the sensing layer and the gas molecules.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor

Liu

Liang

et al. 2021

ChemistrySelect

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Tin dioxide (SnO2) film is fabricated on the Silicon (Si) nanopillars surface with more than 5 aspect ratio via direct current (DC) magnetron sputtering for the first time. Form the XRD curves, SnO2 film become multi‐crystalline after annealing at 750 °C with 2 hours, and the nanopillars substrates have no influence on the crystallization of the SnO2 film. For the morphology, the SnO2 film on the polished Si surface becomes from planar to plicated after annealing, while there is no morphology change of the SnO2 film on Si nanopillars surface, which proves that the Si nanopillars surface is more suitable for heat and stress release during the annealing process. After testing the gas sensor properties of the SnO2 based gas sensors, the results reveal that the nanopillars based gas sensors have the higher gas response than the planar ones no matter for ethanol or acetone, with or without Au decoration. The Si nanopillars substrate with high aspect ratio makes the SnO2 film to have a larger surface to contact with air and target gas, and to have more defects to react with O2 and reducing gas molecules, which may be a promise method to fabricate the gas sensor with high response.

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Section: Resultsmentioning

confidence: 99%

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor

Liu

Liang

et al. 2021

ChemistrySelect

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“…The suspension was ultrasonicated (f = 22 kHz, P = 130 W) for 2 minutes and SnO2•nH2O sol was prepared. According to the TEM analysis, after heating SnO2•nH2O xerogel at 600 °C, SnO2 powder was obtained with a narrow particle size distribution and average diameter d ≈ 5.5 nm [10][11][12].…”

Section: Methods Of Synthesismentioning

confidence: 99%

“…The structural features of these nanocomposites are considered to explain the differences in the properties of the sensors. The structural characteristics of these nanocomposites were studied in details in our previous work [12]. The states of Au and the surface of SnO2 in SnO2-Au 0 and SnO2-Au III nanocomposites are presented in Table 1.…”

Section: Structural Featuresmentioning

confidence: 99%

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Semiconductor Metal Oxides Doped with Gold Nanoparticles for Use in Acetone Gas Sensors

Ovodok

Kormosh

Bilanych

et al. 2022

J. Phys.: Conf. Ser.

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The effect of nanosized gold particles on the adsorption-sensitive properties of SnO2–Au sensors under the detection of acetone vapors has been studied. Different techniques for the preparation of SnO2–Au nanocomposites with an average Au particle size of 2 nm were applied. It has been found that a fivefold increase in the sensor response to acetone vapors and threshold sensitivity (C lim) of 0.1 ppm are achieved by adding gold to tin dioxide in the colloidal form during synthesis. While adding gold in ion form (Au (III)) leads to a growth of the sensor response to acetone vapors by 2.7 times and defines C lim of 0.2 ppm. The slope of the calibration curves of the SnO2–Au sensors allows registering acetone vapors at concentrations ranging from C lim to 5 ppm. This concentration range can be used for express diagnostics in diabetes. The enhanced sensitivity of SnO2–Au sensors to acetone vapors can be explained by an increase in the adsorption-catalytic activity of tin ions as a result of the modifying effect of sulfate groups and the envolving of highly dispersed gold in the adsorption – catalytic process of oxidation of acetone molecules.

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“…Recent reports highlighted the advantages of sensors based on heterostructures due to the synergistic effect of their components [ 34 , 35 , 36 ]. The modification of the surface of semiconductors with noble metal cores allows the generation of additional adsorption centers, which can increase sensitivity to detectable gases by changing the electrical conductivity of the semiconductor or chemical sensitization mechanisms [ 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Heterostructures Based on Cobalt Phthalocyanine Films Decorated with Gold Nanoparticles for the Detection of Low Concentrations of Ammonia and Nitric Oxide

et al. 2022

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This work is aimed at the development of new heterostructures based on cobalt phthalocyanines (CoPc) and gold nanoparticles (AuNPs), and the evaluation of the prospects of their use to determine low concentrations of ammonia and nitric oxide. For this purpose, CoPc films were decorated with AuNPs by gas-phase methods (MOCVD and PVD) and drop-casting (DC), and their chemiresistive sensor response to low concentrations of NO (10–50 ppb) and NH3 (1–10 ppm) was investigated. A comparative analysis of the characteristics of heterostructures depending on the preparation methods was carried out. The composition, structure, and morphology of the resulting hybrid films were studied by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma atomic emission (ICP-AES) spectroscopy, as well as electron microscopy methods to discuss the effect of these parameters on the sensor response of hybrid films to ammonia and nitric oxide. It was shown that regardless of the fabrication method, the response of Au/CoPc heterostructures to NH3 and NO gases increased with an increase in the concentration of gold. The sensor response of Au/CoPc heterostructures to NH3 increased 2–3.3 times compared to CoPc film, whereas in the case of NO it increased up to 16 times. The detection limits of the Au/CoPc heterostructure with a gold content of ca. 2.1 µg/cm2 for NH3 and NO were 0.1 ppm and 4 ppb, respectively. It was shown that Au/CoPc heterostructures can be used for the detection of NH3 in a gas mixture simulating exhaled air (N2—74%, O2—16%, H2O—6%, CO2—4%).

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Effect of Au nanoparticles on the gas sensitivity of nanosized SnO2

Cited by 12 publications

References 37 publications

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor

Semiconductor Metal Oxides Doped with Gold Nanoparticles for Use in Acetone Gas Sensors

Heterostructures Based on Cobalt Phthalocyanine Films Decorated with Gold Nanoparticles for the Detection of Low Concentrations of Ammonia and Nitric Oxide

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Effect of Au nanoparticles on the gas sensitivity of nanosized SnO2

Cited by 12 publications

References 37 publications

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO2‐Based Gas Sensor

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO2‐Based Gas Sensor

Semiconductor Metal Oxides Doped with Gold Nanoparticles for Use in Acetone Gas Sensors

Heterostructures Based on Cobalt Phthalocyanine Films Decorated with Gold Nanoparticles for the Detection of Low Concentrations of Ammonia and Nitric Oxide

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Product

Resources

About

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor

The Influence of Silicon Nanopillars Structure as the Substrate on the SnO₂‐Based Gas Sensor