Enhancement in NH3 sensing performance of ZnO thin-film via gamma-irradiation

Waikar, Maqsood R.; Raste, Pooja M.; Sonker, Rakesh K.; Gupta, Vinay; Tomar, Monika; Shirsat, Mahendra D.; Sonkawade, R. G.

doi:10.1016/j.jallcom.2020.154641

Cited by 61 publications

(13 citation statements)

References 45 publications

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“…The attractive physicochemical properties of ZnO, including abundant Zn–O bonds, fluorescence effect, and wide bandgap (3.37 eV) have made it to be a promising material for applications in solar cells, , catalysis, , lithium ion batteries, , and gas sensors. − In terms of gas sensor, ZnO as an important n-type semiconductor metal oxide, is sensitive to a variety of gases under various conditions, such as acetone, ethanol, NH 3 , and CO . Moreover, it has merits of low cost, low dielectric constant, high luminous transmittance, large electromechanical coupling coefficient, and high chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Lei

Gao

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Zinc oxide (ZnO) as a commonly used semiconductor material has aroused extensive research attention in various fields, such as field-effect transistors, solar cells, luminescent devices, and sensors, because of its excellent light-electrical features and large exciton bonding energy. Herein, ultrasmall Au nanoparticles with tunable size decorated mesoporous ZnO nanospheres were synthesized via facile formaldehyde-assisted metal−ligand cross-linking strategy, where these active Au species could be transferred into Au nanoparticles in the frameworks by various reduction strategies. Typically, mesoporous ZnO−Au with a photoreduction technique showed superior ethanol sensing performance (ca. 159 for 50 ppm at 200 °C) because of its high surface area, dualmesoporous structure, and interface effect (electron effect, surface catalytic/adsorption). Moreover, the mesoporous ZnO−Au composites by photoreduction show much better performance than those via H 2 reduction and NaBH 4 reduction, which is ascribed to the providential size of Au nanoparticles (ca. 6.6 nm) and abundant oxygen defects in the composites. In particular, the selectivity and sensitivity of mesoporous ZnO−Au far exceeds those of materials loaded with other noble metals (Pt, Pd, and Ag). The sensing mechanism of mesoporous ZnO−Au for ethanol is attributed to classical surface adsorption/catalytic reaction, where strong sensitization effect (electron and chemical) and the spillover effect of Au nanoparticles in the catalytic reaction cause superior ethanol sensing performances. In situ FTIR and GC-MS measurement revealed that the catalytic oxidation of ethanol follows the process of dehydrogenation and deep oxidation, that is, dehydrogenation to acetaldehyde, and then further oxidation to carbon dioxide and water.

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Section: Introductionmentioning

confidence: 99%

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Lei

Gao

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Nickel doping in the wurtzite‐type ZnO compound provides very high response to the different gas environments (Jagadale et al, 2018; Waikar et al, 2020). Shirage et al (2016) examined the reaction of Ni‐doped ZnO nanorods to the CO 2 gas in the year of 2016 and reported that the samples possessed 200% response to the CO 2 concentration of 1% at 470 K. Shukla, Kumar, Srivastava, Pandey, and Pandey (2018) studied on the CO 2 gas sensing properties of Al‐doped ZnO structure and found 250% response value to 500 ppm CO 2 concentration at 670 K. In our examination for this paper, we conduct on the CO 2 gas detection properties of Ni and Al‐doped ZnO nanorods.…”

Section: Resultsmentioning

confidence: 99%

Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Bulut

Öztürk

Acar

2021

Microscopy Res & Technique

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In the present study, the one‐dimensional ZnO nanorod structures are produced within the different nickel and aluminum molecular weight ratios of 0–7% using the hydrothermal method. It is found that the aluminum (Al) and nickel (Ni) impurities with different ionic radius, chemical valence, and electron configurations of outer shell cause to vary the fundamental characteristic features including the crystallinity quality, crystallite size, surface morphology, nanorod diameter, optical absorbance, energy band gap, resistance, gas response, and gas sensing properties. The structural analyses performed by powder X‐ray diffraction (XRD) and scanning electron microscopy (SEM) indicate that the samples are found to crystallize in the hexagonal wurtzite structure. The presence of optimum nickel and aluminum in the crystal system improves considerably the crystallinity quality and surface morphology. Additionally, the combination of electron dispersive X‐ray (EDX) and XRD results declare that the Ni and Al impurities incorporate successfully into the ZnO crystal structure. Moreover, the diameters of nanorod structures in 1D orientation are determined to be 80 nm or below. The hexagonal wurtzite‐type ZnO nanorod structure prepared by 5% Ni has more space between the nanorods and thus presents higher response to the CO2 detection. Further, the optical absorbance spectra display that the band gap value is observed to decrease regularly with the increment in the doping level as a result of band shrinkage effect depending on the enhancement of mobile hole carrier concentrations in the crystal structure. In other words, the doping mechanism leads to vary the homogeneities in the interfacial charges, nanorod diameters, ZnO oxide layer composition and thickness. The last test conducted in this study is responsible for the determination of CO2 gas sensing levels. The obtained gas sensing results are further compared with each other and literature findings. It is observed that 5% Ni‐doped sample provides more successful results than other samples in the sensing CO2 gas at the different concentrations. All in all, the paper establishing a strong methodology between doping mechanism and change in the fundamental characteristic features of hexagonal wurtzite‐type ZnO with the aid of advanced microscopy techniques will become pioneering research to answer key questions in materials sciences and electronic research.

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“…A thin film-based sensor is a type of transducer which converts a physical or chemical quantity into equivalent electrical for measurement. It is used to detect the presence of stimulus to very low concentrations of toxic or harmful target environment (gases) of importance, such as ammonia [77], carbon monoxide [78], carbon dioxide [79], nitrogen dioxide [80], sulfur dioxide [81], propane [82], liquefied petroleum gas [83], hydrogen sulfide [84], and volatile organic compounds. Worldwide thin film gas sensing technology is playing a major role in protecting the environment and improving homeland security.…”

Section: Thin Film Based Sensormentioning

confidence: 99%

Recent Developments on the Properties of Chalcogenide Thin Films

Soonmin¹,

Paulraj²,

Kumar³

et al. 2022

Chalcogenides - Preparation and Applications

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Chalcogenide thin films have attracted a great deal of attention for decades because of their unique properties. The recent developments on thin film-based supercapacitor applications were reported. As a result of sustained efforts, the experimental findings revealed remarkable properties with enhanced fabrication methods. The properties of perovskite solar cells were discussed in terms of crystal structure and phase transition, electronic structure, optical properties, and electrical properties. Perovskite solar cell has gained attention due to its high absorption coefficient with a sharp absorption edge, high photoluminescence quantum yield, long charge carrier diffusion lengths, large mobility, high defect tolerance, and low surface recombination velocity. The thin film-based gas sensors are used for equally the identification and quantification of gases, and hence should be both selective and sensitive to a required target gas in a mixture of gases. Metal chalcogenide materials are considered excellent absorber materials in photovoltaic cell applications. These materials exhibited excellent absorption coefficient and suitable band gap value to absorb the maximum number of photons from sun radiation. The photovoltaic parameters were strongly dependent on various experimental conditions.

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Enhancement in NH3 sensing performance of ZnO thin-film via gamma-irradiation

Cited by 61 publications

References 45 publications

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Recent Developments on the Properties of Chalcogenide Thin Films

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Enhancement in NH3 sensing performance of ZnO thin-film via gamma-irradiation

Cited by 61 publications

References 45 publications

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Size-Controlled Au Nanoparticles Incorporating Mesoporous ZnO for Sensitive Ethanol Sensing

Effect of Ni and Al doping on structural, optical, and CO2 gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Recent Developments on the Properties of Chalcogenide Thin Films

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Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method