Evaluation of the Structure–Micromorphology Relationship of Co10%–Alx Co-doped Zinc Oxide Nanostructured Thin Films Deposited by Pulsed Laser Using XRD and AFM

Ghribi, Faouzi; Khalifi, Najet; Mrabet, S.; Ghiloufi, Imed; Ţălu, Ștefan; Mır, L. El; Filho, Henrique Duarte da Fonseca; Oliveira, Rosane Maria Pessoa Betânio; Matos, Robert Saraiva

doi:10.1007/s13369-022-06568-0

Cited by 8 publications

(3 citation statements)

References 65 publications

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“…The morphology-controlled synthesis of metal oxide nanocrystals has gained much scientific interest because of their modulated physical properties induced by intrinsic defects associated with different morphologies [1,2]. Among them, ZnO has attracted more attention for its extensive applications in photocatalysts, ultraviolet blocks, and dye-sensitized solar cells [3][4][5][6]. ZnO is a semiconductor whose crystalline lattice can be easily engineered with different structural defects during crystal growth [7,8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest

et al. 2022

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ZnO nanocrystals with three different morphologies have been synthesized via a simple sol-gel-based method using Brosimum parinarioides (bitter Amapá) and Parahancornia amapa (sweet Amapá) latex as chelating agents. X-ray diffraction (XRD) and electron diffraction patterns (SAED) patterns showed the ZnO nanocrystals were a pure hexagonal wurtzite phase of ZnO. XRD-based spherical harmonics predictions and HRTEM images depicted that the nanocrystallites constitute pitanga-like (~15.8 nm), teetotum-like (~16.8 nm), and cambuci-like (~22.2 nm) shapes for the samples synthesized using bitter Amapá, sweet Amapá, and bitter/sweet Amapá chelating agent, respectively. The band gap luminescence was observed at ~2.67–2.79 eV along with several structural defect-related, blue emissions at 468–474 nm (VO, VZn, Zni), green emissions positioned at 513.89–515.89 (h-), and orange emission at 600.78 nm (–). The best MB dye removal efficiency (85%) was mainly ascribed to the unique shape and oxygen vacancy defects found in the teetotum-like ZnO nanocrystals. Thus, the bitter Amapá and sweet Amapá latex are effective chelating agents for synthesizing distinctive-shaped ZnO nanocrystals with highly defective and remarkable photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest

et al. 2022

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“…The increase in surface roughness might be due to the decreased grain size and more compact surface morphology of the synthesized nanoparticles. 54,55 The CZO-4 exhibited the highest surface roughness among the CZO samples, indicating favourable sensing characteristics with faster response and recovery times. Higher roughness values are desirable in various applications as they enhance surface adsorption and increase the likelihood of oxygen adhering to the surface, which is a key aspect in gas sensing studies.…”

Section: Surface Roughness From Atomic Force Microscopy (Afm)-mentioning

confidence: 99%

Synthesis and Characterization of Flower-Like Cobalt-Doped ZnO Nanostructures for Ammonia Sensing Applications

Himabindu,

Latha Devi,

Nagaraju

et al. 2024

ECS J. Solid State Sci. Technol.

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The present study uses the co-precipitation method to explore the synthesis of zinc oxide and cobalt-doped ZnO sensors, encompassing a range of cobalt concentrations from 1 to 4 wt.%. The synthesized samples undergo comprehensive analysis to evaluate their structural, morphological, optical, and gas-sensing properties. X-ray diffraction revealed a hexagonal Wurtzite structure, and the crystallite size decreased from 16.92 to 15.39 nm. Energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy collectively affirmed the presence of cobalt. Scanning electron microscopy was used to analyze the morphological characteristics. The Tauc-plot was used to determine the optical bandgap via diffuse reflectance spectroscopy. As cobalt doping increased, the band gap increased from 3.18 to 3.23 eV. Further, atomic force microscopy and Brunauer-Emmett-Teller analysis were used to assess the surface topography and pore size distribution. The AFM measurements indicated roughness within 435-700 nm. The BET analysis revealed mesoporous properties, with surface area ranging between 18.657 to 21.962 m2/g. Subsequently, the gas-sensing capabilities of the Co-doped ZnO sensors were examined for various volatile organic compounds at room temperature. The sensor with 4% Cobalt doping exhibited a fast response and recovery time of 21 and 20 seconds for 2 ppm of NH3

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“…It is also worth exploring the possibility of implementing the ES method for co-doping using a mixture of appropriate amounts and types of precursors. We have selected Al for codoping of cobalt-doped ZnO films because it has been shown that co-doping of ZnO with Co and Al enables the synthesis of transparent and conductive materials with specific magnetic properties [32,33]. Furthermore, Khan et al [34] have recently theoretically studied the effect of Co/Al co-doping of ZnO and have shown that additional electrons introduced by Al change the magnetic ground state of Co-doped ZnO from an antiferromagnetic to a ferromagnetic state, and the estimated Curie temperature is expected to be higher than room temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of Structure, Morphology and Optical Properties of Cobalt-Doped and Co/Al-co-Doped ZnO Thin Films Deposited by Electrospray Method

Marinov,

Georgieva,

Vasileva

et al. 2023

Applied Sciences

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A versatile electrospray method was utilized for deposition of thin ZnO films doped with Co (5%) (CZO) or co-doped with Co (2.5%) and Al (2.5%) (CAZO). Thin polycrystalline films with approximate thickness of 200 nm and high transmittance (more than 80%) were obtained. No additional XRD peaks due to dopant impurities or dopant oxides were observed. The cobalt doping led to decrease in grain size and increase in crystallite size from 22 nm to 29 nm in the (101) direction. Smaller changes were observed for the CAZO films. Surface roughness of the films was measured using a 3D optical profiler. Surface roughness of the doped films was from 5 nm to 9 nm higher than that of the pure films. Refractive index, extinction coefficient and thickness of the films were calculated using ellipsometric measurements and were further used for determination of optical band gap and Urbach energy. Refractive index and optical band gap increased with doping from 1.86 and 3.29 eV for pure ZnO to 2.00 and 3.35 eV for CZO and 1.97 and 3.33 eV for CAZO films. Through calculation of Urbach energy (119 meV for pure ZnO, 236 meV for CZO and 138 meV for CAZO), it was demonstrated that doping leads to an increase in structural disorder, most pronounced in the case of Co doping.

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Evaluation of the Structure–Micromorphology Relationship of Co10%–Alx Co-doped Zinc Oxide Nanostructured Thin Films Deposited by Pulsed Laser Using XRD and AFM

Cited by 8 publications

References 65 publications

Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest

Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest

Synthesis and Characterization of Flower-Like Cobalt-Doped ZnO Nanostructures for Ammonia Sensing Applications

Study of Structure, Morphology and Optical Properties of Cobalt-Doped and Co/Al-co-Doped ZnO Thin Films Deposited by Electrospray Method

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