Optical and sensing properties of Al doped ZnO nanocrystalline thin films prepared by spray pyrolysis

Shukla, R. K.; Kumar, Nishant; Srivastava, Anchal; Pandey, Akhilesh; Pandey, Mamta

doi:10.1016/j.matpr.2017.10.027

Cited by 11 publications

(3 citation statements)

References 23 publications

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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. It is determined that the selected 1D orientation provides a positive effect on sensing when comparing to the literature results.…”

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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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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“…À temperatura ambiente o ZnO não é tóxico, termicamente estável, biocompatível e eletroquimicamente ativo como material semicondutor de óxido tecnológico. [4][5][6] ZnO NPs além de apresentar propriedades antibacterianas, anticorrosivas, antifúngicas e UV propriedades de filtragem mostram perspectivas promissoras para drogas anticancerígenas/-entrega de genes, imagem celular, biossensing e assim por diante 7 .…”

Section: Introductionunclassified

Estudo do Efeito da Taxa de Cisalhamento da Solução Reacional na Obtenção de Nanopartículas de Óxido de Zinco

Gouvêa¹,

Silva²,

Gonçalves

2022

Rev. Proc. Q.

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Nanopartículas de óxido de Zinco (ZnO) têm tido crescente interesse nas pesquisas e desenvolvimento, devido a suas características de biocompatibilidade, inércia química e elevada área superficial, tem sido apontado como material promissor para a aplicação nos mas diferenciados ramos industriais; tais como; carreadores de fármacos, sensores ambientais, reforço para compósitos entre outros. Contudo os formatos das partículas são determinantes como requisito para tais aplicações. Neste trabalho, as partículas de ZnO são obtidas via co-precipitação, sendo essa uma das técnicas mais baratas e acessíveis a produção em larga escala. Os parâmetros de processo influenciam no formato final das partículas obtidas, assim estudou-se diferentes velocidades de agitação para a produção das partículas e avaliou-se a forma obtida por microscopia eletrônica de varredura, verificando-se que a taxa de cisalhamento, vinculada à velocidade de agitação mecânica empregada no meio reacional da síntese por co-precipitação implica na variação do formato das partículas formadas.

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“…Reports have been published to increase the sensing capability of metal oxides by doping with aluminium. [28][29][30] In the present work, we studied aluminium (Al) doping into the α-Fe 2 O 3 lattice to increase gas sensing capabilities. Al-doped α-Fe 2 O 3 (0, 5, 10, and 15 wt%) thin films were prepared using the chemical spray pyrolysis method and subsequently annealed at 450 °C, and their gas sensing capabilities were examined.…”

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confidence: 99%

Effect Annealing Temperature on Pure and Al-Doped Iron Oxide Thin Films for Formaldehyde Gas Sensing Application

Sivasankaraiah,

Nagaraju,

Satya Narayana Murthy

2023

ECS J. Solid State Sci. Technol.

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The present study employs chemical spray pyrolysis to prepare pure and Al-doped α-Fe2O3 thin films with different aluminium concentrations which were subsequently annealed at 450°C and investigated for the effect of annealing temperature on structural, morphological, optical, chemical, and gas sensing properties. Field emission scanning electron microscopy and X-ray diffraction studies were adapted to examine the morphologies and microstructural properties of the prepared films. All films were polycrystalline with rhombohedral structure, and the (104) plane was confirmed to be the favoured orientation. Deposited thin films were seen to have agglomerated, superimposed sphere-like particles on their surfaces. Raman spectroscopy analysis and XPS were used to examine the film's symmetry and structural characteristics. Pure and Al-doped films' optical band gap increased with the introduction of 5 wt% Al concentration, decreasing further enhancement of Al concentration in the Fe2O3 matrix and the film's formaldehyde sensing capability was examined based on aluminium doping concentration. The film with 10 wt% of Al content showed the most significant sensitivity towards 5 ppm formaldehyde at room temperature. The results of the experiments showed that the gas-detecting capabilities have been significantly enhanced by the optimal content of Al added to the α-Fe2O3 lattice.

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Optical and sensing properties of Al doped ZnO nanocrystalline thin films prepared by spray pyrolysis

Cited by 11 publications

References 23 publications

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

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

Estudo do Efeito da Taxa de Cisalhamento da Solução Reacional na Obtenção de Nanopartículas de Óxido de Zinco

Effect Annealing Temperature on Pure and Al-Doped Iron Oxide Thin Films for Formaldehyde Gas Sensing Application

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Optical and sensing properties of Al doped ZnO nanocrystalline thin films prepared by spray pyrolysis

Cited by 11 publications

References 23 publications

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

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

Estudo do Efeito da Taxa de Cisalhamento da Solução Reacional na Obtenção de Nanopartículas de Óxido de Zinco

Effect Annealing Temperature on Pure and Al-Doped Iron Oxide Thin Films for Formaldehyde Gas Sensing Application

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Product

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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

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