Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles

Moosavi, Fatemeh; Bahrololoom, M.E.; Kamjou, Ramin; Mirzaei, Ali; Leonardi, Salvatore Gianluca; Neri, G.

doi:10.3390/chemosensors6040061

Cited by 19 publications

(8 citation statements)

References 34 publications

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“…As shown in Figure a, the gas sensor exhibits a nonlinear change in the concentration versus gas response. This pattern is consistent with the observations reported in various studies. − These studies emphasized nonlinear trends extending beyond certain concentrations according to the S ∼ C n dependence. In this study, the gas response exhibits a consistent linear relationship within the 1–300 ppm range.…”

Section: Resultssupporting

confidence: 92%

Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture

Soltabayev,

Raiymbekov,

Nuftolla

et al. 2024

ACS Sens.

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Cobalt-doped ZnO (CZO) thin films were deposited on glass substrates at room temperature by radio frequency (RF) magnetron sputtering of a single target prepared with ZnO and Co 3 O 4 powders. Changes in the crystallinity, morphology, optical properties, and chemical composition of the CZO thin films were investigated at various sputtering powers of 45, 60, and 75 W. All samples presented a hexagonal wurtzite-type structure with a preferential c-axis at the (002) plane, along with a distinct change in the strain values through X-ray diffraction patterns. Scanning electron and atomic force microscopy revealed uniform and dense deposition of nanorod CZO samples with a high surface roughness (RMS). The Hall mobility and carrier concentration increased with the introduction of Co + ions into the ZnO matrix, as seen from the Hall effect study. The gradual increase of the power applied on the target source significantly affected the morphology of the CZO thin film, which is reflected in the CO 2 -sensing performance. The best gas response to CO 2 was recorded for CZO-60 W with a response of 1.45 for 500 ppm CO 2 , and the response/recovery times were 72 and 35 s, respectively. The distinguishing feature of the CZO sensor is its ability to effectively and rapidly detect the CO 2 target gas at room temperature (∼27 °C, RT).

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Section: Resultssupporting

confidence: 92%

Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture

Soltabayev,

Raiymbekov,

Nuftolla

et al. 2024

ACS Sens.

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“…The sensor response ( S ) is defined as S = R g / R a , where R g and R a are the electrical resistance values of the sensor in the presence and absence of target gases, respectively. Detail of the sensor fabrication and measurements can be found in earlier reports …”

Section: Methodsmentioning

confidence: 99%

Gas Sensing of NiO‐SCCNT Core–Shell Heterostructures: Optimization by Radial Modulation of the Hole‐Accumulation Layer

Raza

Movlaee

Leonardi

et al. 2019

Adv Funct Materials

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Hierarchical core-shell (C-S) heterostructures composed of a NiO shell deposited onto stacked-cup carbon nanotubes (SCCNTs) are synthesized by atomic layer deposition (ALD). A film of NiO particles (0.80-21.8 nm in thickness) is uniformly deposited onto the inner and outer walls of the SCCNTs. The electrical resistance of the samples is found to increase of many orders of magnitude with the increasing of the NiO thickness. The response of NiO-SCCNT sensors toward low concentrations of acetone and ethanol at 200 °C is studied. The sensing mechanism is based on the modulation of the hole-accumulation region in the NiO shell layer upon chemisorption of the reducing gas molecules. The electrical conduction mechanism is further studied by the incorporation of an Al 2 O 3 dielectric layer at NiO and SCCNT interfaces. The investigations on NiO-Al 2 O 3 -SCCNT, Al 2 O 3 -SCCNT, and NiO-SCCNT coaxial heterostructures reveal that the sensing mechanism is strictly related to the NiO shell layer. The remarkable performance of the NiO-SCCNT sensors toward acetone and ethanol benefits from the conformal coating by ALD, large surface area of the SCCNTs, and the optimized p-NiO shell layer thickness followed by the radial modulation of the space-charge region.

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“…Metal oxide based chemiresistors were reported to be sensitive to hydrogen, but they have drawbacks like requirement of high operating temperature (150 °C or higher), poor detection limit, and selectivity. 99,223,224 Even with the use of metal oxide heterostructures, only a few authors could achieve a low concentration detection of H 2 at the cost of a high operating temperature. Table 4 summarizes some of the work that aims at low ppm detection of H 2 (≤100 ppm) using hybrid sensing materials.…”

Section: Hydrogen Sensors Based On Mo Heterostructuresmentioning

confidence: 99%

Nanoscale Heterostructured Materials Based on Metal Oxides for a Chemiresistive Gas Sensor

Mondal

Gogoi

2022

ACS Appl. Electron. Mater.

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Nanomaterials with exceptional physical and chemical properties are the key to the success of the next generation of gas sensor technology, which is expected to have special features like being lightweight and flexible for wearability, mechanical robustness, reliable operation with wide environmental changes, and self-powered, in addition to the general sensor characteristics. The design of the chemiresistor with nanostructured hybrid material has indicated a great potential to meet these current demands, drawing significant attention to the technological developments in the past decades. The nanotechnology driven strategic design of the hybrid nanostructures is predicted to be pivotal for the development of nanomaterials bearing distinct physical and chemical properties and catalytic power, enabling them to produce overall improvements in sensor efficiency. In this review, a comprehensive review on the recent progress of hybrid gas sensors fabricated by coupling various metal oxides and 2D materials like transition metal dichalcogenides, graphene, and its derivatives are presented. The limitations of the current materials, key challenges, as well as the futuristic strategy for material design delivering fascinating properties and modern growth techniques are highlighted. A special emphasis has been given to hybrid sensors made with transition metal dichalcogenides, which are considered to be an emerging material and very few works have reported on its hybrid with metal oxides. The relevance of reliable detection of hydrogen is felt due to the dramatic rise in the use of hydrogen in industrial, commercial, and household purposes. As the whole world is moving toward a hydrogen economy, reliable, accurate, and robust hydrogen sensors will be a crucial component of the technological systems. In view of this, the current status and recent progress on hydrogen sensors based on heterostructured nanomaterials are also presented to the reader.

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Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles

Cited by 19 publications

References 34 publications

Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture

Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture

Gas Sensing of NiO‐SCCNT Core–Shell Heterostructures: Optimization by Radial Modulation of the Hole‐Accumulation Layer

Nanoscale Heterostructured Materials Based on Metal Oxides for a Chemiresistive Gas Sensor

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Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles

Cited by 19 publications

References 34 publications

Sensitivity Enhancement of CO2 Sensors at Room Temperature Based on the CZO Nanorod Architecture

Sensitivity Enhancement of CO2 Sensors at Room Temperature Based on the CZO Nanorod Architecture

Gas Sensing of NiO‐SCCNT Core–Shell Heterostructures: Optimization by Radial Modulation of the Hole‐Accumulation Layer

Nanoscale Heterostructured Materials Based on Metal Oxides for a Chemiresistive Gas Sensor

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Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture

Sensitivity Enhancement of CO₂ Sensors at Room Temperature Based on the CZO Nanorod Architecture