Simple preparation of Ni/CuO nanocomposites with superior sensing activity toward the detection of methane gas

Shaalan, Nagih M.; Morsy, Asmaa E. A.; Abdel-Rahim, M.A.; Rashad, M.

doi:10.1007/s00339-021-04543-4

Cited by 16 publications

(5 citation statements)

References 36 publications

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“…The size of the NiO fine crystals was ~5–10 nm, as shown in the lattice image of Figure 3 b, although some nanoparticles were aggregated to form large particles, as shown in Figure 3 a. The d-spacing of the NiO particles is 0.23 nm, which corresponds to the crystal plane of NiO (111) [ 18 , 19 ]. Figure 3 b proves that NiO fine particles are well attached to the surface of graphene.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Supercapacitor Performance of In Situ Doped Laser-Induced Multilayer Graphene via NiO

et al. 2023

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Herein, we have reported a novel strategy for improving the electrochemical performance of laser-induced graphene (LIG) supercapacitors (SCs). The LIG was prepared using a CO2 laser system. The polyimide polymer was the source material for the fabrication of the LIG. The doping process was performed in situ using the CO2 laser, which works as a rapid thermal treatment to combine graphene and NiO particles. NiO was used to improve the capacitance of graphene by combining an electric double-layer capacitor (EDLC) with the pseudo-capacitance effect. The high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and Raman spectroscopy showed that the structure of the LIG is multilayered and waved. The HRTEM image proves the distribution of NiO fine particles with sizes of 5–10 nm into the graphene layers. The electrochemical performance of the as-prepared LIG was tested. The effect of the combination of the two materials (oxide and carbon) was investigated at different concentrations. The LIG showed a specific capacitance of 69 Fg−1, which increased up to 174 Fg−1 for the NiO-doped LIG. The stability investigations showed that the electrodes were very stable for more than 1000 cycles. This current study establishes an innovative method to improve the electrochemical properties of LIG.

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Section: Resultsmentioning

confidence: 99%

Improvement of Supercapacitor Performance of In Situ Doped Laser-Induced Multilayer Graphene via NiO

et al. 2023

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“…Moreover, NO 2 can react with the electron surface directly or through surface oxygen species. In addition, the oxygen molecules adsorb on the surface in different forms such as O 2 − at a temperature less than 200 • C, O − at 200-400 • C, and O 2− at higher temperatures [42,47]. According to the results described above, a part of the adsorbed molecules of NO 2 bonded with surface electrons to form nitrite (NO − 2 ) at the nonstoichiometric surface of BaCO 3 at low temperatures (<200 • C), as a possible reaction: NO 2 gas + e − → NO − 2 (7) where the formation of NO − 2 is thermally activated, indicating the increase in the sensor response with the increase in temperature up to 250 • C, as shown in Figure 6.…”

Section: Discussionmentioning

confidence: 99%

Promising Novel Barium Carbonate One-Dimensional Nanostructures and Their Gas Sensing Application: Preparation and Characterization

Shaalan

2022

Chemosensors

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Recently, barium carbonate-based nanomaterials have been used for sensor and catalysis applications. The sensing performance can be improved with a suitable one-dimensional nanostructure. In this regard, novel nanosized BaCO3 materials were fabricated by a one-pot designed thermal evaporation system. Ten milligrams of Ba as raw material were used to deposit BaCO3 nanostructures at a pressure of 0.85 torr and a temperature of 850 °C in a partial oxygen atmosphere of the ambient. This simple method for fabricating novel BaCO3 nanostructures is presented here. X-ray diffraction was indexed on the orthorhombic polycrystalline structure of the prepared BaCO3. The nanostructures deposited here could be described as Datura-like structures linked with nanowires of 20–50 nm in diameter and 5 µm in length. The BaCO3 nanostructure prepared by the current method exhibited a semiconductor-like behavior with an activation energy of 0.68 eV. This behavior was ascribed to the nature of the morphology, which may possess large defective points. Thus, this nanostructure was subjected to gas sensing measurements, showing high activity toward NO2 gas. The proposed sensor also underwent deep investigation toward NO2 at various gas concentrations and working. The response and recovery time constants were recorded in the ranges of 6–20 s and 30–150 s, respectively. The sensor showed its reversibility toward NO2 when the sensor signal was repeated at various cycles of various concentrations. The sensor was exposed to different levels of humidity, showing high performance toward NO2 gas at 250 °C. The sensor exhibited fast response and recovery toward NO2 gas.

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“…With the increase in temperature within this range, both the sensing performance and the response and recovery times exhibited enhancement. The observed decline in sensor resistance during CH 4 exposure was also attributed to the methane molecule dissociation [47][48][49]. This dissociation leads to a reaction with adsorbed oxygen ions, releasing trapped electrons and consequently resulting in a reduction in resistance.…”

Section: Gas Sensing Properties Of Zno Npsmentioning

confidence: 97%

Gas Sensing Performance of Zinc Oxide Nanoparticles Fabricated via Ochradenus baccatus Leaf

Khan,

Shaalan,

Ahmed

et al. 2024

Chemosensors

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ZnO nanoparticles (NPs) were prepared by green synthesis using plant leaf extraction of Ochradenus baccatus and characterized by XRD, FESEM, HRTEM, and Raman spectroscopy techniques. Since elevated CO levels have been associated with inflammatory conditions, cardiovascular diseases, and respiratory disorders and the methane gas primarily produced by gut microbiota and linked to gastrointestinal disorders and other abnormal methane levels in breath samples, the nanoparticles were applied for gas sensor fabrication. Thus, the gas sensors fabricated using ZnO nanoparticles were investigated for CH4, H2, CO, and NO2 gases. The gas sensing was performed for the fabricated sensors at various operating temperatures and gas concentrations. Interestingly, leaf-extracted green synthesized ZnO NPs were more sensitive to CH4, CO, and NO2 gases than to H2. The results of sensing studies revealed that the nanoparticles exhibit a selectivity toward gas depending on the gas type. The sensor response was also studied against the humidity. These findings bridge between the laboratory and industry sectors for future gas sensors development, which can be used for exhaled breath analysis and serve as potential diagnostic tools for highly sensitive contagious diseases.

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Simple preparation of Ni/CuO nanocomposites with superior sensing activity toward the detection of methane gas

Cited by 16 publications

References 36 publications

Improvement of Supercapacitor Performance of In Situ Doped Laser-Induced Multilayer Graphene via NiO

Improvement of Supercapacitor Performance of In Situ Doped Laser-Induced Multilayer Graphene via NiO

Promising Novel Barium Carbonate One-Dimensional Nanostructures and Their Gas Sensing Application: Preparation and Characterization

Gas Sensing Performance of Zinc Oxide Nanoparticles Fabricated via Ochradenus baccatus Leaf

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