Preparation and structural-optical characterization of dip-coated nanostructured Co-doped ZnO dilute magnetic oxide thin films

Valerio, L.; Mamani, N. C.; Zevallos, A. Ortiz de; Mesquita, Alexandre; Bernardi, M. I. B.; Doriguetto, Antônio C.; Carvalho, H. B. de

doi:10.1039/c7ra01200d

Cited by 33 publications

(13 citation statements)

References 62 publications

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“…By increasing the Co impurity, it can be observed that the intensity of transmittance increases. This is because the Co 2+ ion doped in the ZnO matrix increases the 3d electrons and it causes to the transmittance intensity to increase …”

Section: Resultsmentioning

confidence: 99%

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Akhtari

Zorriasatein

Farahmandjou

et al. 2017

Int J Applied Ceramic Tech

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In this work, we have prepared Co‐doped ZnO nanocomposites by zinc nitrate and cobalt sulfate as new precursors via the coprecipitation method and the samples were followed to identify the morphological, optical, structural, and magnetic properties. The XRD patterns revealed the crystalline nature of nanoparticles with hexagonal wurtzite structures, which meant that Co impurity did not disturb the structure of pure ZnO and the minimum crystallite size of nanoparticles was calculated to be around 37 nm. The XRD patterns also showed the lattice parameter increase owing to the incorporation of a Co dopant. The TEM results revealed the sphere‐like particles whose size varied between 56 and 88 nm in diameter at a 4% level of impurity. DRS analysis identified that the band gap energy decreased from 3.18 eV for the pure substance to 2.36 eV for the 10% impure substance. VSM analysis exhibited that the saturation magnetization value increased to 8.4 × 10−3 emu/g for the highest Co content of 10%, which indicated the ferromagnetic behavior of NPs.

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Section: Resultsmentioning

confidence: 99%

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Akhtari

Zorriasatein

Farahmandjou

et al. 2017

Int J Applied Ceramic Tech

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“…Co-doped ZnO thin films were synthesized by dip-coating technique and showed strong ferromagnetism. Various defects, oxygen vacancies and zinc interstices increase with the increase in Co concentration, which supports suitable candidates for room-temperature ferromagnetism [94].…”

Section: Doping In Zno and Ferromagnetismmentioning

confidence: 65%

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

et al. 2020

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In recent years, many efforts have been made to develop advanced metal oxide semiconductor nanomaterials with exotic magnetic properties for modern applications w.r.t traditional analogues. Dilute magnetic semiconductor oxides (DMSOs) are promising candidates for superior control over the charge and spin degrees of freedom. DMSOs are transparent, wide band gap materials with induced ferromagnetism in doping, with a minor percentage of magnetic 3d cation to create a long-range antiferromagnetic order. Although significant efforts have been carried out to achieve DMSO with ferromagnetic properties above room temperature, it is a great challenge that still exists. However, TiO2, SnO2, ZnO and In2O3 with wide band gaps of 3.2, 3.6, 3.2 and 2.92 eV, respectively, can host a broad range of dopants to generate various compositions. Interestingly, a reduction in the size of these binary oxides can induce ferromagnetism, even at room temperature, due to the grain boundary, presence of defects and oxygen vacancies. The present review provides a panorama of the structural analysis and magnetic properties of DMSOs based on binary metal oxides nanomaterials with various ferromagnetic or paramagnetic dopants, e.g., Co, V, Fe and Ni, which exhibit enhanced ferromagnetic behaviors at room temperature.

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“…Chemical methods, such as the spin-coating, dip-coating, and sol-gel have been applied for the preparation of metal oxide thin films and nanoparticles [46][47][48]. The aforementioned methods are very convenient for the fabrication of composite structures due to the availability of precursor materials [47][48][49]. The morphology, alignment, density, aspect ratio, and crystalline quality of the materials that were prepared by sol-gel are directly related to the seed layer parameters [46].…”

Section: Metal Oxide Nanostructures Growth and Fabrication Methodsmentioning

confidence: 99%

Metal Oxide Nanostructures in Food Applications: Quality Control and Packaging

et al. 2018

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Metal oxide materials have been applied in different fields due to their excellent functional properties. Metal oxides nanostructuration, preparation with the various morphologies, and their coupling with other structures enhance the unique properties of the materials and open new perspectives for their application in the food industry. Chemical gas sensors that are based on semiconducting metal oxide materials can detect the presence of toxins and volatile organic compounds that are produced in food products due to their spoilage and hazardous processes that may take place during the food aging and transportation. Metal oxide nanomaterials can be used in food processing, packaging, and the preservation industry as well. Moreover, the metal oxide-based nanocomposite structures can provide many advantageous features to the final food packaging material, such as antimicrobial activity, enzyme immobilization, oxygen scavenging, mechanical strength, increasing the stability and the shelf life of food, and securing the food against humidity, temperature, and other physiological factors. In this paper, we review the most recent achievements on the synthesis of metal oxide-based nanostructures and their applications in food quality monitoring and active and intelligent packaging.

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Preparation and structural-optical characterization of dip-coated nanostructured Co-doped ZnO dilute magnetic oxide thin films

Abstract: We demonstrate the feasibility to prepare Co-doped ZnO thin films (Zn1−xCoxO, x = 0; 0.01; 0.03 and 0.05) via the dip-coating technique, a very simple and a low-cost process. We focus the structural and the optical analyses in the context of the DMOs.

Cited by 33 publications

References 62 publications

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

Metal Oxide Nanostructures in Food Applications: Quality Control and Packaging

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Preparation and structural-optical characterization of dip-coated nanostructured Co-doped ZnO dilute magnetic oxide thin films

Abstract: We demonstrate the feasibility to prepare Co-doped ZnO thin films (Zn1−xCoxO, x = 0; 0.01; 0.03 and 0.05) via the dip-coating technique, a very simple and a low-cost process. We focus the structural and the optical analyses in the context of the DMOs.

Cited by 33 publications

References 62 publications

Structural, optical, thermoelectrical, and magnetic study of Zn1‐xCoxO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn1‐xCoxO (0 ≤ x ≤ 0.10) nanocrystals

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

Metal Oxide Nanostructures in Food Applications: Quality Control and Packaging

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Product

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Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals