“…The variation in the strain is may be due to the alteration in structure, crystallite size and morphology. The estimated dislocation density and the strain values are also recorded in Table 2 35 , 45 , 46 . Figure 1 XRD pattern of the Fe 2 O 3 –CuO–CuFe 2 O 4 nanocomposite.…”
Section: Resultsmentioning
confidence: 99%
“…The Fe 2 O 3 –CuO–CuFe 2 O 4 nanocomposite (NC) was synthesized using the sol–gel method 20 , 35 – 38 . Initially, two separate solutions were prepared: one with Cu(NO 3 ) 2 ·3H 2 O (5.798 g in 30 mL of ethanol) and another with Fe(NO 3 ) 3 ·9H 2 O (9.69 g in 30 mL of ethanol), keeping a molar ratio of 1:1.…”
Section: Materials Methods and Characterization Techniquesmentioning
confidence: 99%
“…The antibacterial effectiveness of Fe 2 O 3 –CuO–CuFe 2 O 4 NC was evaluated in vitro using the widely recognized disk diffusion method 39 – 41 . The assessment involved testing against specific Gram-positive ( S. aureus ) and Gram-negative ( E. coli ) bacterial strains, with azithromycin (AzM) serving as the reference standard 35 . Initially, the bacterial strains were cultured at 37 ± 1°C for 24 h and then adjusted with nutrient broth to achieve an absorbance of 0.075–0.1.…”
Section: Materials Methods and Characterization Techniquesmentioning
The synthesis of the Fe2O3–CuO–CuFe2O4 nanocomposite was effectively achieved through the sol–gel technique, utilizing ethanol as a reactive fuel. Investigation of the nanocomposite’s structure via X-ray Diffraction confirmed the coexistence of Fe2O3, CuO, and CuFe2O4 phases within the material. The Scherrer equation was applied to determine an average crystallite size ranging from 60 to 95 nm. UV–visible spectroscopy studies suggested the material possesses an approximate energy bandgap of 4 eV. Scanning Electron Microscopy provided insights into the nanocomposite’s surface morphology, which exhibited a porous and heterogeneous aggregation of particles in various sizes and shapes. When tested for antibacterial efficacy, the nanocomposite exhibited activity against gram-positive S. aureus with a maximum zone of inhibition (ZOI) measuring 9 mm at the highest concentration, whereas no inhibitory effect was detected against gram-negative E.coli.
“…The variation in the strain is may be due to the alteration in structure, crystallite size and morphology. The estimated dislocation density and the strain values are also recorded in Table 2 35 , 45 , 46 . Figure 1 XRD pattern of the Fe 2 O 3 –CuO–CuFe 2 O 4 nanocomposite.…”
Section: Resultsmentioning
confidence: 99%
“…The Fe 2 O 3 –CuO–CuFe 2 O 4 nanocomposite (NC) was synthesized using the sol–gel method 20 , 35 – 38 . Initially, two separate solutions were prepared: one with Cu(NO 3 ) 2 ·3H 2 O (5.798 g in 30 mL of ethanol) and another with Fe(NO 3 ) 3 ·9H 2 O (9.69 g in 30 mL of ethanol), keeping a molar ratio of 1:1.…”
Section: Materials Methods and Characterization Techniquesmentioning
confidence: 99%
“…The antibacterial effectiveness of Fe 2 O 3 –CuO–CuFe 2 O 4 NC was evaluated in vitro using the widely recognized disk diffusion method 39 – 41 . The assessment involved testing against specific Gram-positive ( S. aureus ) and Gram-negative ( E. coli ) bacterial strains, with azithromycin (AzM) serving as the reference standard 35 . Initially, the bacterial strains were cultured at 37 ± 1°C for 24 h and then adjusted with nutrient broth to achieve an absorbance of 0.075–0.1.…”
Section: Materials Methods and Characterization Techniquesmentioning
The synthesis of the Fe2O3–CuO–CuFe2O4 nanocomposite was effectively achieved through the sol–gel technique, utilizing ethanol as a reactive fuel. Investigation of the nanocomposite’s structure via X-ray Diffraction confirmed the coexistence of Fe2O3, CuO, and CuFe2O4 phases within the material. The Scherrer equation was applied to determine an average crystallite size ranging from 60 to 95 nm. UV–visible spectroscopy studies suggested the material possesses an approximate energy bandgap of 4 eV. Scanning Electron Microscopy provided insights into the nanocomposite’s surface morphology, which exhibited a porous and heterogeneous aggregation of particles in various sizes and shapes. When tested for antibacterial efficacy, the nanocomposite exhibited activity against gram-positive S. aureus with a maximum zone of inhibition (ZOI) measuring 9 mm at the highest concentration, whereas no inhibitory effect was detected against gram-negative E.coli.
“…The energy gap (E g ) was calculated by using the following equation 20 , 28 – 30 : where C 1 is a constant, h is the Planck constant and α is the optical absorption coefficient. The energy gap of pure α-Al 2 O 3 was 5.28 eV as shown in Fig.…”
In this work, we prepared a pure α-Al2O3, α-Al2O3/CuO (AC) and α-Al2O3/V2O5 (AV) nanocomposite. The sol–gel method was used to prepare pure α-Al2O3, (AC) and (AV) samples at 1200 °C. Structural, electrical, and optical properties of the prepared samples were investigated using the X-ray diffraction (XRD), UV–Visible spectrophotometer, and conductivity meter, respectively. The XRD results confirmed the crystalline nature and the presence of the hexagonal structure of α-Al2O3, the rhombohedra structure of CuAlO2 and the tetragonal structure of V2O5. Moreover, the crystallite size of pure α-Al2O3 was 43.1 nm, while the crystallite size of α-Al2O3 in samples AC and AV nanocompsite was 24.05 nm and 34.84 nm respectively. The optical measurements showed that the band gap α-Al2O3 decreased significantly from 5.28 eV for pure to 3.7 and 3.4 eV to AC and AV respectively. The DC electrical conductivity (σd.c) values were measured for all prepared samples at room temperature. The electrical conductivity was 2.4 × 10–7 and 1.8 × 10–7 (Ω cm)−1 in AC and AV nanocompsite respectively, while ionic conductivity (σion) decreased from 3 × 10–10 in pure α-Al2O3 to 7 × 10–5 and 1 × 10–5 in AC and AV nanocompsite, respectively. The results showed an improvement in the structural, optical, and electrical properties, which may make these materials a candidate for use in many applications, such as photocatalytic, gas sensors, optoelectronics, microelectronics, semiconductor devices, ……etc.
“…Copper oxide (CuO) has prime properties with low-cost preparation. It is a p-type semiconductor, has a narrow energy bandgap ranging between 1.2 and 1.8 eV, and, is nontoxic [13][14][15]. More recently, CuO has been used in certain applications such as electrode material in Li-ion batteries, super capacitors, photocatalytic activity, solar cells, and gas sensing [1,16].…”
In the present study, the sol-gel method has been utilized to synthesize tri-phase CuO-Fe2O3-MgOnanocomposites (NCs) by employing tartaric acid (TA) as an organic fuel. The obtained NCs were characterized using XRD, SEM, FTIR, and UV-Vis. The XRD pattern asserted the formation of NCs with MgO (cubic), CuO (monoclinic), and Fe2O3 (hexagonal) crystals. The crystallite size (Dav) was calculated by Scherrer's formula, whereas the optical properties were assessed using UV-Vis spectra. The optical band gap values of the synthesized materials displayed variations related to tartaric acid concentration due to the quantum confinement of tri-metal oxide NCs. The SEM described the morphological properties and FTIR confirmed the formation of interfaces among the metal oxides CuO, Fe2O3 and MgO in the NCs. The enhanced optical properties of these tri-metal oxide NCs make them a good candidate for optoelectronic applications.
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