Size-effect on the optical behavior of Fe-doped CuO nanoparticles synthesized by a freeze-drying process

Oliveira, Azauri Albano de; Valerio-Cuadros, Marlon Ivan; Tupan, Lilian Felipe da Silva; Ivashita, Flávio F.; Paesano, Andrea

doi:10.1016/j.matlet.2018.07.009

Cited by 17 publications

(2 citation statements)

References 11 publications

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“…Through freeze-drying followed by thermal treatments of metal acetates, our research group obtained the following nanostructured materials: enriched iron(III) acetate [12], iron acetate (III) anhydrous [13], the dilute magnetic semiconductor oxides ZrFeO 2 [14] e CuFeO [15]. The main objectives of this work are to:…”

Section: Introductionmentioning

confidence: 99%

Structural and morphological study of Mn, Zn and Zr freeze-dried transition metal acetates

et al. 2023

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Manganese (II) acetates tetrahydrate, zinc dihydrate and anhydrous zirconium, processed by freeze-drying, were heat-treated in free atmosphere at different temperatures and times, generating the main oxides of these metals. These acetates were structurally characterized by scanning electron microscopy (SEM), thermogravimetry (TG), differential scanning calorimetry (DSC) and, along with all the oxides generated, by X-ray diffraction (XRD). Calculations obtained from TG data showed that manganese acetate lost two waters after freeze-drying, also confirmed by X-ray data and that the same phenomenon may be occurring for zinc acetate. The results indicate that exothermic events occurred at lower temperatures for freeze-dried acetates, which may be related to the high surface area of the material, and consequent greater reactivity. The total decomposition temperatures of the acetates in the ZnO and ZrO2 semiconducting oxides and the manganese oxides Mn2O3 and Me3O4, with excellent crystallization, were obtained.

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Section: Introductionmentioning

confidence: 99%

Structural and morphological study of Mn, Zn and Zr freeze-dried transition metal acetates

et al. 2023

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“…In the global needs the large production of Copper industry for the last decades increasingly being used for superconducting, semiconducting, thermo electrics, sensors, ceramics, energy storage, antifouling paints, photoconductive and photo thermal applications, including the automotive, ship, and aerospace industries. Oxide-based diluted magnetic semiconductors (DMS) are gaining more attention currently, because of their potential for a spintronic application [1][2][3][4][5]. The metal oxide NPs are the good physical and chemical properties the NPs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of different percentage (Fe2+) doped copper oxide (CuO) NPs prepared by chemical method

Subhalakshmi¹,

Karunakaran²,

Kasirajan³

et al. 2019

IJSRPAS

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In the last decade the metal oxide NPs are the promising applications in the research field. The lot of methods to available in the synthesis of NPs, but co-precipitation method is very simple, low cost and environmental friendly. The different percentage (Fe 2+ ) doped copper oxide (CuO) NPs prepared by co-precipitation method. XRD pattern confirms the samples are crystalline in monoclinic structure identified by the JCPDS Card. No (80-0076). The doping concentration increases the crystalline size also decreases. CuO NPs based functional groups are identified from FTIR spectra. UV-Vis Spectroscopy the Fe doped CuO has a band gap is determined in the range of 3.57 to 3.62 eV. The Pl emission spectra revealed a blue shift after introducing Fe into CuO structure, from these studies is better for the preparation of CuO nanoparticles. SEMthe surface morphology of the as prepared CuO nanoparticles has identified by SEM studies the indefinite and closely packed grain is observed. The EDAX spectra showed presence copper, Fe and oxygen atoms.

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Highly Selective and Reversible Detection of Simulated Breath Hydrogen Sulfide Using Fe‐Doped CuO Hollow Spheres: Enhanced Surface Redox Reaction by Multi‐Valent Catalysts

Kim,

Sohn,

Min

et al. 2024

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The precise and reversible detection of hydrogen sulfide (H2S) at high humidity condition, a malodorous and harmful volatile sulfur compound, is essential for the self‐assessment of oral diseases, halitosis, and asthma. However, the selective and reversible detection of trace concentrations of H2S (≈0.1 ppm) in high humidity conditions (exhaled breath) is challenging because of irreversible H2S adsorption/desorption at the surface of chemiresistors. The study reports the synthesis of Fe‐doped CuO hollow spheres as H2S gas‐sensing materials via spray pyrolysis. 4 at.% of Fe‐doped CuO hollow spheres exhibit high selectivity (response ratio ≥ 34.4) over interference gas (ethanol, 1 ppm) and reversible sensing characteristics (100% recovery) to 0.1 ppm of H2S under high humidity (relative humidity 80%) at 175 °C. The effect of multi‐valent transition metal ion doping into CuO on sensor reversibility is confirmed through the enhancement of recovery kinetics by doping 4 at.% of Ti‐ or Nb ions into CuO sensors. Mechanistic details of these excellent H2S sensing characteristics are also investigated by analyzing the redox reactions and the catalytic activity change of the Fe‐doped CuO sensing materials. The selective and reversible detection of H2S using the Fe‐doped CuO sensor suggested in this work opens a new possibility for halitosis self‐monitoring.

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Size-effect on the optical behavior of Fe-doped CuO nanoparticles synthesized by a freeze-drying process

Cited by 17 publications

References 11 publications

Structural and morphological study of Mn, Zn and Zr freeze-dried transition metal acetates

Structural and morphological study of Mn, Zn and Zr freeze-dried transition metal acetates

Synthesis and characterization of different percentage (Fe2+) doped copper oxide (CuO) NPs prepared by chemical method

Highly Selective and Reversible Detection of Simulated Breath Hydrogen Sulfide Using Fe‐Doped CuO Hollow Spheres: Enhanced Surface Redox Reaction by Multi‐Valent Catalysts

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