Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations. Part 1: 1D and 2D Nanostructures

Korotcenkov, Ghenadii

doi:10.3390/nano10071392

Cited by 103 publications

(71 citation statements)

References 408 publications

(755 reference statements)

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“…The specific surface area of nanowires is extremally large, and as a result there are many atoms at the surface that can react chemically with the ambient atmosphere. On this premise, it is widely acknowledged that the use of nanostructures, including nanowires and nanobelts, as gas sensing materials can greatly improve parameters of gas sensors [ 29 ]. However, reports in the literature on the use of β-Ga 2 O 3 nanowires in VOC sensors are still rare.…”

Section: Introductionmentioning

confidence: 99%

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

et al. 2021

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Gas sensitive structures made of nanowires exhibit extremally large specific surface area, and a great number of chemically active centres that can react with the ambient atmosphere. This makes the use of nanomaterials promising for super sensitive gas sensor applications. Monoclinic β-Ga2O3 nanowires (NWs) were synthesized from metallic gallium at atmospheric pressure in the presence of nitrogen and water vapor. The nanowires were grown directly on interdigitated gold electrodes screen printed on Al2O3 substrates, which constituted the gas sensor structure. The observations made with transmission electron microscope (TEM) have shown that the nanowires are monocrystalline and their diameters vary from 80 to 300 nm with the average value of approximately 170 nm. Au droplets were found to be anchored at the tips of the nanowires which may indicate that the nanowires followed the Vapor–Liquid–Solid (VLS) mechanism of growth. The conductivity of β-Ga2O3 NWs increases in the presence of volatile organic compounds (VOC) even in the temperature below 600 °C. The gas sensor based on the synthesized β-Ga2O3 NWs shows peak sensitivity to 100 ppm of ethanol of 75.1 at 760 °C, while peak sensitivity to 100 ppm of acetone is 27.5 at 690 °C.

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Section: Introductionmentioning

confidence: 99%

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

et al. 2021

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“…As an example, a portion of cuprous ion in copper (I) oxide (Cu 2 O) can be oxidized to cupric form that resulted in Cu 2-x O which is a metal deficient composition. Similarly, ferric ion in iron (III) oxide (Fe 2 O 3 ) can be reduced to resulted ferrous form, resulted in Fe 2 + x O 3 which are metal-rich composition [6][7][8]. Withdraw from stoichiometry in the case of non-TMOs that includes MgO is usually appeared as small and in the order of 10 −4 % even at an extreme temperature usually greater than 1700 °C.…”

Section: Introductionmentioning

confidence: 99%

Rational Design and Advance Applications of Transition Metal Oxides

Ikram¹,

Raza²,

Hassan³

et al. 2021

Transition Metal Compounds - Synthesis, Properties, and Application

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An attractive class of transition metal oxides (TMOs) have been freshly concerned with increasing research interest worldwide concerning stoichiometric and non-stoichiometric configurations as well, that usually exhibits a spinel structure. These TMOs will contribute substantial roles in the production of eco-friendly and low-cost energy conversion (storage) devices owing to their outstanding electrochemical properties. The current chapter involves the summary of the latest research and fundamental advances in the effectual synthesis and rational design of TMOs nanostructures with meticulous size, composition, shape, and micro as well as nanostructures. Also applications of TMOs such as effective photocatalyst, gas sensing, biomedical, and as an electrode material that can be utilized for lithium-ion batteries, and photovoltaic applications. Additionally, certain future tendencies and visions for the development of next-generation advanced TMOs for electrochemical energy storage methods are also displayed.

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“…However, significant potential remains for further performance improvements; thus, a large research effort is currently underway aimed at additional development. Among the different classes of available devices, those relying on semiconducting metal oxides (MOx) as the sensing material are particularly popular [ 1 ], due to their low cost, robustness and high sensitivity. Their sensing principle is based on the variation of the electrical resistance when in the presence of certain gases [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization and Performance of Low Power Gas Sensors Based on (GaxIn1-x)2O3 Nanowires

López-Aymerich

Domènech-Gil

Moreno

et al. 2021

Sensors

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Active research in nanostructured materials aims to explore new paths for improving electronic device characteristics. In the field of gas sensors, those based on metal oxide single nanowires exhibit excellent sensitivity and can operate at extremely low power consumption, making them a highly promising candidate for a novel generation of portable devices. The mix of two different metal oxides on the same nanowire can further broaden the response of this kind of gas sensor, thus widening the range of detectable gases, without compromising the properties related to the active region miniaturization. In this paper, a first study on the synthesis, characterization and gas sensing performance of (GaxIn1-x)2O3 nanowires (NWs) is reported. Carbothermal metal-assisted chemical vapor deposition was carried out with different mixtures of Ga2O3, In2O3 and graphite powders. Structural characterization of the NWs revealed that they have a crystalline structure close to that of In2O3 nanowires, with a small amount of Ga incorporation, which highly depends on the mass ratio between the two precursors. Dedicated gas nanosensors based on single NWs were fabricated and tested for both ethanol and nitrogen dioxide, demonstrating an improved performance compared to similar devices based on pure In2O3 or Ga2O3 NWs.

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Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations. Part 1: 1D and 2D Nanostructures

Cited by 103 publications

References 408 publications

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

Rational Design and Advance Applications of Transition Metal Oxides

Fabrication, Characterization and Performance of Low Power Gas Sensors Based on (GaxIn1-x)2O3 Nanowires

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