High-performance gas sensor array for indoor air quality monitoring: the role of Au nanoparticles on WO<sub>3</sub>, SnO<sub>2</sub>, and NiO-based gas sensors

Lee, Jinho; Jung, Youngmo; Sung, Seung Hyun; Lee, Gilho; Kim, Jung Mo; Seong, Joon Kyung; Shim, Young Seok; Jun, Seong Chan; Jeon, Seungwon

doi:10.1039/d0ta08743b

Cited by 200 publications

(61 citation statements)

References 47 publications

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“…In a composite with conductivity through these aggregates, when hydrogen is detected, electronic sensitization of the sensor effect is manifested due to the transfer of electrons from the In 2 O 3 particles to the SnO 2 and ZnO particles with a higher electron affinity, since the degree of electron transfer as a result of the sensory process increases [18]. In [89], the role of chemical and electronic sensitization by gold nanoparticles on the detection of acetone, toluene, ammonia, and hydrogen sulfide by metal oxide composites based on WO 3 , SnO 2 , and NiO is also analyzed in detail.…”

Section: The Influence Of Heterogeneous Contacts On the Sensory Effectmentioning

confidence: 99%

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: The Influence Of Heterogeneous Contacts On the Sensory Effectmentioning

confidence: 99%

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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“…In the case of linear sensors, this can be achieved through a simple normalization of the sensor response. 38 This consists of dividing the response of each sensor by the sum of the responses of all sensors of the array. In the case of an array of N linear sensors, the response of the i -th sensor (Δ R ij / R i ) to the j -th compound at concentration c ( c j ) is where S ij is the sensitivity of the i -th sensor to the j -th compound.…”

Section: Resultsmentioning

confidence: 99%

Gas Sensor Array Using a Hybrid Structure Based on Zeolite and Oxide Semiconductors for Multiple Bio-Gas Detection

Park

Tabata

2021

ACS Omega

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Semiconductor-type gas sensors, composed of metal-oxide semiconductors and porous zeolite materials, are attractive devices for bio-gas detection, particularly when used as bio-gas sensors such as electronic nose application. Previous studies have shown such detection can be obtained with a separate gas concentrator and a sensor device using zeolites and oxide semiconductors of WO 3 nanoparticles. By applying the gas concentrator, porous molecular structures alter both the gas sensitivity and the selectivity, and even can be used to define the sensor characteristics. Based on such a gas sensor design, we investigated the properties of an array of three sensors made of a layer of WO 3 nanoparticles coated with zeolites with different interactions between gas molecule adsorption and desorption. The array was tested with four volatile organic compounds, each measured at different concentrations. The results confirm that the features of individual zeolites combined with the hybrid gas sensor behavior, along with the differences among the sensors, are sufficient for enabling the discrimination of volatile compounds when disregarding their concentration.

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“…While Au nanoparticles supported on the surface without using the ZIF structure as a template are prone to agglomeration due to their high surface energy, enervating catalytic performance [ 48 , 49 ]. Secondly, when introducing precious metals into semiconductor-based resistance sensing devices, the mechanisms of “electronic sensitization” and “chemical sensitization” should be considered [ 50 , 51 , 52 ]. Electron sensitization occurs because the electrons in ZnO transfer to Au when Au nanoparticles are in contact with ZnO, which expands the depletion zone of ZnO.…”

Section: Resultsmentioning

confidence: 99%

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

Kang

Zhang

Wang

et al. 2021

Sensors

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It is of great significance to develop ethanol sensors with high sensitivity and low detection temperature. Hence, we prepared Au-supported material on mesoporous ZnO composites derived from a metal-organic framework ZIF-8 for the detection of ethanol gas. The obtained Au/ZnO materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (SEM), field emission transmission electron microscopy (TEM) and nitrogen adsorption and desorption isotherms. The results showed that the Au/ZnO-1.0 sample maintains a three-dimensional (3D) dodecahedron structure with a larger specific surface area (22.79 m2 g−1) and has more oxygen vacancies. Because of the unique ZIF structure, abundant surface defects and the formation of Au-ZnO Schottky junctions, an Au/ZnO-1.0 sensor has a response factor of 37.74 for 100 ppm ethanol at 250 °C, which is about 6 times that of pure ZnO material. In addition, the Au/ZnO-1.0 sensor has good selectivity for ethanol. According to density functional theory (DFT) calculations, the adsorption energy of Au/ZnO for ethanol (−1.813 eV) is significantly greater than that of pure ZnO (−0.217 eV). Furthermore, the adsorption energy for ethanol is greater than that of other gases.

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High-performance gas sensor array for indoor air quality monitoring: the role of Au nanoparticles on WO₃, SnO₂, and NiO-based gas sensors

Cited by 200 publications

References 47 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

Gas Sensor Array Using a Hybrid Structure Based on Zeolite and Oxide Semiconductors for Multiple Bio-Gas Detection

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

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High-performance gas sensor array for indoor air quality monitoring: the role of Au nanoparticles on WO3, SnO2, and NiO-based gas sensors

Cited by 200 publications

References 47 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

Gas Sensor Array Using a Hybrid Structure Based on Zeolite and Oxide Semiconductors for Multiple Bio-Gas Detection

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

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Product

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High-performance gas sensor array for indoor air quality monitoring: the role of Au nanoparticles on WO₃, SnO₂, and NiO-based gas sensors