Some physical investigations on hexagonal-shaped nanorods of lanthanum-doped ZnO

Mrabet, C.; Kamoun, Olfa; Boukhachem, A.; Amlouk, M.; Manoubi, T.

doi:10.1016/j.jallcom.2015.07.009

Cited by 73 publications

(13 citation statements)

References 65 publications

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“…Furthermore, additional insights on the impact of the Co and Mn atoms incorporation on the structural properties of the sprayed ZnO material can be obtained from the texture coefficient (TC), the dislocation density (δ), and the internal strain (ε). The value of the texture coefficient (TC), which indicates the abundance of grains in a (hkl) orientation, was calculated using the Harris method as follows [ 38 , 39 ]: TC (hkl) = [I hhk /I 0 ] ⁄ [ n −1 × (∑I hkl )⁄I 0 )], where n , I hkl , and I 0 are the number and the intensity of reflections, respectively. The measured intensity of the (hkl) orientation and the corresponding intensity of the XRD reference are provided by the JCPDS 036-1451 card.…”

Section: Resultsmentioning

confidence: 99%

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

et al. 2020

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Undoped as well as (Co, Mn) co-doped Zinc oxides have been effectively developed on glass substrates, taking advantage of the spray pyrolysis procedure. The X-ray diffraction XRD as well as X-ray photoelectron spectroscopy (XPS) measurements have recognized a pure hexagonal wurtzite form of ZnO, and no other collateral phases such as MnO2 or CoO2 have been observed as a result of doping. The calculated values of the texture coefficient (TC) were between 0.15 and 5.14, indicating a dominant orientation along the (002) plane. The crystallite size (D) varies with the (Co, Mn) contents. The dislocation density (δ) as well as the residual microstrains increased after Co and Mn doping. Furthermore, the surface morphology of the films has been affected significantly by the Co and Mn incorporation, as shown by the scanning electron microscopy (SEM) investigation. The study of the optical properties exhibits a red shift of the band gap energy (Eg) with the (Co, Mn) co-doping. The magnetic measurements have shown that the undoped and (Co, Mn) co-doped ZnO thin films displayed room-temperature ferromagnetism (RTFM).

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Section: Resultsmentioning

confidence: 99%

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

et al. 2020

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“…The calculated values of micro-strain of the films are listed in Table 3. The dislocation density (δ) is calculated using the following equation 22 .where D is the average crystallite size. The corresponding D values of the films are also listed in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Habib

Tajuddin

Noor

et al. 2019

Sci Rep

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Low power consumption, fast response and quick recovery times are important parameters for gas sensors performance. Herein, we report the experimental and theoretical studies of ZnO and Cr doped ZnO nanostructures used in low temperature (50 °C) sensors for the detection of CO. The synthesized films were characterized by XRD, UV-Vis, FE-SEM and EDX. The XRD patterns for the ZnO and 0.5 wt% Cr/ZnO films confirm the formation of a single-phase hexagonal wurtzite structure. The reduction of the ZnO optical band gap from 3.12 eV to 2.80 eV upon 0.5 wt% Cr doping is well correlated with the simulation data. The FE-SEM images of the films show spherical morphology with the estimated particle sizes of about ~40 nm and ~ 25 nm were recorded for the ZnO and 0.5 wt% Cr/ZnO films, respectively. Enhanced gas sensing performance is achieved with Cr doping and the sensitivity of ZnO increases from 9.65% to 65.45%, and simultaneously decreasing the response and recovery times from 334.5 s to 172.3 s and from 219 s to 37.2 s, respectively. These improvements in gas sensing performance are due to the reduction in particle size and optical band gap, and an increase in specific surface area.

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“…On the other hand, dielectric calculations are used to determine optical relaxation time op which correspond to the lifetime of photo-excited carriers. In the near infrared region, optical relaxation time op is related to real and imaginary parts ( 1 and 2) of the complex dielectric constant via the relation [42,43]. The calculated values of relaxation time are shown in Table 2.…”

Section: Optical Studymentioning

confidence: 99%

Enhancement of photocatalytic degradation of MB by recyclable Li/Mn3O4 thin films

Amara

Larbi

Mahdhi³

et al. 2021

J Mater Sci: Mater Electron

Self Cite

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Thin films of physical--mixture of Hausmannite Mn3O4 and lithium (Li) are synthesized by spray pyrolysis technique. Structural, morphological, optical, electrical, wettability and photocatalytic properties have been investigated. X-ray diffraction (XRD) and Raman spectra, Scanning electron microscope (SEM) images and electrical measurements show that Li nanoparticles are formed both on top surface of the film and inside grain boundaries.Bandgap and Urbach energies and optical relaxation time have been determined from transmittance T and reflectance R spectra. Impedance spectroscopy shows that charge separation increases with Li content, which improves photocatalytic efficiency of the film.The best photocatalytic efficiency is obtained for Li/Mn ratio of 15%. Indeed, the degradation of methylene blue (MB) under ultraviolet (UV) and visible light exposure, is improved by a factor of 5.7 and 2.4 respectively, when compared to undoped Mn3O4. In addition, this film exhibits a high photostability (10 cycles consecutively) under solar light. On the other hand, hydrophobicity reveals the hydrophilic character of the films.

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Some physical investigations on hexagonal-shaped nanorods of lanthanum-doped ZnO

Cited by 73 publications

References 65 publications

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Enhancement of photocatalytic degradation of MB by recyclable Li/Mn3O4 thin films

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