Influence of Al doping on the structural, morphological, optical, and gas sensing properties of ZnO nanorods

Ganesh, R. Sankar; Navaneethan, M.; Mani, Ganesh Kumar; Ponnusamy, S.; Tsuchiya, Kazuyoshi; Muthamizhchelvan, C.; Kawasaki, Shigeo; Hayakawa, Y.

doi:10.1016/j.jallcom.2016.12.187

Cited by 174 publications

(66 citation statements)

References 46 publications

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“…In Section 6.3, the comparison between MTV and CV data was analyzed for the cases presented in Sections 6.1 and 6.2. The kinetic diameter for the acetone molecule used for all the calculations was d = 470 pm, as reported in Van der Perre et al [24], which is also similar to the values reported in other recent works [25,26]. Moreover, since the investigated gas flow can be considered as isothermal, the mean free path of the mixture was estimated by modeling molecular interactions through hard sphere potentials.…”

Section: Resultssupporting

confidence: 76%

“…Preliminary analysis revealed a significant sensitivity of the reconstructed velocity profile to the parameters H and D. Future efforts aim to better characterize the sensitivity of the post-processing algorithm and to improve the accuracy on the measurements of the channel height and of the diffusion coefficient. An important challenge related to the latter intent is given by the fact that the diffusion coefficient D strongly depends on the value used for the acetone molecular diameter d. In this work, the value d = 470 pm provided by Van der Perre et al [24] was considered because this result is supported by several other authors [25,26]. Nevertheless, there are also other works in the literature that provide quite different estimations of the acetone kinetic diameter, which allow variations from 460 to 730 pm (590 pm by Almy et al [28], 616 pm in Nydatok et al [29], and 730 pm in Frezzotti et al [13]).…”

Section: Discussionmentioning

confidence: 84%

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Velocity Measurements in Channel Gas Flows in the Slip Regime by means of Molecular Tagging Velocimetry

et al. 2020

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Direct measurements of the slip velocity in rarefied gas flows produced by local thermodynamic non-equilibrium at the wall represent crucial information for the validation of existing theoretical and numerical models. In this work, molecular tagging velocimetry (MTV) by direct phosphorescence is applied to argon and helium flows at low pressures in a 1-mm deep channel. MTV has provided accurate measurements of the molecular displacement of the gas at average pressures of the order of 1 kPa. To the best of our knowledge, this work reports the very first flow visualizations of a gas in a confined domain and in the slip flow regime, with Knudsen numbers up to 0.014. MTV is cross-validated with mass flowrate measurements by the constant volume technique. The two diagnostic methods are applied simultaneously, and the measurements in terms of average velocity at the test section are in good agreement. Moreover, preliminary results of the slip velocity at the wall are computed from the MTV data by means of a reconstruction method.

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Section: Resultssupporting

confidence: 76%

Section: Discussionmentioning

confidence: 84%

Velocity Measurements in Channel Gas Flows in the Slip Regime by means of Molecular Tagging Velocimetry

et al. 2020

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“…On Ag doping, the wider and strong band were observed in the region ∼864.71 cm −1 . Thus, it is validated from the FTIR data, that the Zn-O vibrational mode is prominent with stronger doping characteristics between pure ZnO and Ag-doped ZnO nanomaterials [21][22][23].…”

Section: Chemical Structure Identification Using Ftirmentioning

confidence: 97%

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

Chitradevi

Lenus

Jaya

2019

Mater. Res. Express

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Highly Crystalline pure and Ag-doped ZnO nanoparticles were prepared using the inexpensive sol-gel synthesis method with the stimulation of transition metal ion surfactant. The prepared pure and Agdoped (Silver doped) ZnO nanoparticles were characterised by various sophisticated techniques like x-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Dynamic Light scattering (DLS), Fourier Transform Infrared Spectroscopy (FTIR), UV-visible absorption, Photoluminescence (PL) and Zeta potential. The result indicates that the average grain size of the prepared nanoparticles was found to be a minuscule 24 nm with a commendable bandgap of 3.21 eV and 1.73 eV respectively. The hexagonal wurzite structures of pure and Ag-doped ZnO at room temperature confirmed the luminescence characteristics of the nanoparticles.

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“…The values of β (2.3) and PSI N (288 μm g m −2 h −1 ) for PVA-NaY/PA6 composite membrane were 143% and 160% higher than those for the PVA/PA6 composite membrane ( β = 1.6, PSI N = 180 μm g m −2 h −1 ) during the separation of the azeotropic mixture (20 wt % of EtOH). NaY zeolite possesses the pore size larger (10.1 Å, Table 2 ) than the kinetic diameter of ethanol (4.5 Å [ 45 ]) and ethyl tert -butyl ether, therefore EtOH and ETBE molecules can pass through the pores of NaY zeolite. However, due to the polar character of the NaY, this zeolite attracts ethanol molecules more preferably than less polar ethyl tert -butyl ether, which leads to the increase of membrane selectivity for ethanol.…”

Section: Resultsmentioning

confidence: 99%

A New Type of Composite Membrane PVA-NaY/PA-6 for Separation of Industrially Valuable Mixture Ethanol/Ethyl Tert-Butyl Ether by Pervaporation

et al. 2020

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Pervaporation is a membrane technique used to separate azeotropic and close boiling solvents. Heterogenous PVA composite membranes with NaY zeolite supported on polyamide-6 were fabricated and utilized in organic–organic pervaporation. The efficiency of prepared membranes was evaluated in the separation of ethanol/ethyl tert-butyl ether (EtOH/ETBE) using separation factor (β) and the thickness normalized pervaporation separation index (PSIN). Implementation of the fringe projection phase-shifting method allowed to the determined contact angle corrected by roughness. The influence of the presence of water traces in the feed on the overall separation efficiency was also discussed using the enrichment factor for water (EFwater). The incorporation of NaY into PVA matrix increases surface roughness and hydrophilicity of the composite membrane. It was found that membranes selectively transport ethanol from the binary EtOH/ETBE mixture. The values of β (2.3) and PSIN (288 μm g m−2 h−1) for PVA-NaY/PA6 membrane were improved by 143% and 160% in comparison to the values for the pristine PVA/PA6 membrane. It was found that membranes showed EFwater > 1, thus revealing the preferential transport of water molecules across membranes. These results are also significant for the design of membranes for the removal of water excess from the mixtures of organic solvents.

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Influence of Al doping on the structural, morphological, optical, and gas sensing properties of ZnO nanorods

Cited by 174 publications

References 46 publications

Velocity Measurements in Channel Gas Flows in the Slip Regime by means of Molecular Tagging Velocimetry

Velocity Measurements in Channel Gas Flows in the Slip Regime by means of Molecular Tagging Velocimetry

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

A New Type of Composite Membrane PVA-NaY/PA-6 for Separation of Industrially Valuable Mixture Ethanol/Ethyl Tert-Butyl Ether by Pervaporation

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