An optical study of heterojunction n-ZnO/p-CuO nanosheets and detection of n-butanol vapour at room temperature

Krishna, Kurugundla Gopi; Parne, Saidi Reddy; Nagaraju, P.

doi:10.1007/s10853-023-08997-0

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…This is reliable with the n-type semiconductors sensing mechanism towards the reducing analytes at room temperature. 34 ZnS is low conducting semiconductor with a high resistivity and when the reducing gas like ammonia is introduced then there is an abrupt decrease in resistance that is consistent with the n-type semiconductor.…”

Section: Resultsmentioning

confidence: 82%

Synthesis and Properties of Eu and Ni Co-Doped ZnS Nanoparticles for the Detection of Ammonia Gas

Ankinapalli,

G. S.,

Kurugundla

et al. 2024

ECS J. Solid State Sci. Technol.

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Zinc sulfide nanoparticles were synthesized successfully via chemical co-precipitation, both in undoped form and co-doped with Europium (Eu) and Nickel (Ni). All prepared samples exhibited cubic blended structure as confirmed by X-ray diffraction (XRD). The average particle size ranged from 3 to 6 nm for both pure and (Eu, Ni) co-doped ZnS, with no alteration in the crystal structure due to Eu and Ni co-doping. However, increasing the Ni dopant concentration (0, 2, 4, & 6 at. %) while maintaining a constant Eu concentration (4 at. %) led to an enhancement in the crystallite size. This was further validated by transmission electron microscopy (TEM), which showed particle sizes consistent with the XRD findings (3-5 nm). Microscopic analysis via scanning electron microscopy and TEM revealed spherical agglomerated morphology for the (Eu, Ni) co-doped nanoparticles. Energy-dispersive X-ray spectroscopy spectra confirmed the stoichiometric chemical composition of ZnS: Eu, Ni. Photoluminescence studies demonstrated an increased intensity of green luminescence at 6 at.% Ni co-dopant concentration. Moreover, the synthesized samples exhibited promising gas sensing properties, particularly towards ammonia gas, with good selectivity. Notably, both pure and (Eu, Ni) co-doped ZnS nanoparticles showed rapid response and recovery times at room temperature, suggesting their potential applicability in gas sensing applications.

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Section: Resultsmentioning

confidence: 82%

Synthesis and Properties of Eu and Ni Co-Doped ZnS Nanoparticles for the Detection of Ammonia Gas

Ankinapalli,

G. S.,

Kurugundla

et al. 2024

ECS J. Solid State Sci. Technol.

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“…The addition of the CuO microsphere enhanced the response of the composite in comparison to bare materials (Figure 3), which may be attributed to the presence of more active sites, increasing the depletion layer and enabling charge transfer [55,56]. Additionally, the reduction in band gap energy implies a higher electron transfer and improved gas sensing performance [44]. Upon exposure to NO 2 gas, the nanostructures undergo interactions with the NO 2 molecules adsorbed on the surface, leading to redox reactions, as outlined in Equation ( 8).…”

Section: Gas Sensing Performancementioning

confidence: 99%

“…This enhanced electron transfer is a key factor in reducing the band gap of the composite compared to the bare samples [43]. This lower band gap suggests that electron transfer processes are more likely to occur, which enhances gas sensing performance [44].…”

Section: Optical Propertiesmentioning

confidence: 99%

Enhanced Gas Sensing Performance of CuO-ZnO Composite Nanostructures for Low-Concentration NO2 Detection

Pakdel,

Borsi,

Ponzoni

et al. 2024

Chemosensors

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The detection of nitrogen dioxide (NO2) is essential for safeguarding human health and addressing environmental sustainability. That is why, in the last decades, gas sensors have been developed to detect NO2 to overcome these hazards. This study explores the use of a novel CuO-ZnO composite synthesized through a polyol and sol–gel technique to enhance gas sensing performance. The CuO-ZnO composite offers the advantage of a synergic combination of its properties, leading to improved sensitivity, selectivity, and low detection limit. The innovative polyol technique employed in this research enables the controlled synthesis of hierarchical CuO and porous ZnO structures. The composite formation is achieved using the sol–gel method, resulting in CuO-ZnO composites with different ratios. The structural, morphological, and optical properties of the materials have been characterized using FESEM, X-ray diffraction, and UV-vis spectroscopy. Gas sensing experiments demonstrate enhanced performance, particularly in sensitivity and selectivity for NO2, even at low concentrations. The composites also exhibit improved baseline stability compared to pristine CuO and ZnO. This study explains the influence of humidity on gas sensing properties by examining interactions between water molecules and sensor surfaces. Notably, the developed CuO-ZnO composite displays excellent selectivity towards NO2, attributed to favorable bonding characteristics and acid-base properties. Overall, this research contributes to advancing gas sensor technology, providing a promising potential for sensitive and selective NO2 detection, thereby addressing critical needs for human health and environmental protection.

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Enhanced n-butanol sensing performance of metal-organic frameworks-derived Cr2O3/MXene composites

Geng,

Song,

Xie

et al. 2024

Applied Surface Science

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An optical study of heterojunction n-ZnO/p-CuO nanosheets and detection of n-butanol vapour at room temperature

Cited by 4 publications

References 34 publications

Synthesis and Properties of Eu and Ni Co-Doped ZnS Nanoparticles for the Detection of Ammonia Gas

Synthesis and Properties of Eu and Ni Co-Doped ZnS Nanoparticles for the Detection of Ammonia Gas

Enhanced Gas Sensing Performance of CuO-ZnO Composite Nanostructures for Low-Concentration NO2 Detection

Enhanced n-butanol sensing performance of metal-organic frameworks-derived Cr2O3/MXene composites

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