Performance evaluation of optimized leaf-shaped two-dimension (2D) potassium doped CuO nanostructures with enhanced structural, optical and electronic properties

Siddiqui, Hafsa; Pandey, Padmini; Qureshi, M.S.; Haque, Fozia Z.

doi:10.1016/j.ceramint.2020.05.131

Cited by 27 publications

(7 citation statements)

References 64 publications

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“…The plots are composed of semicircles, and their diameters decrease as the annealing temperature increases 41 . This suggests that there is a higher rate of charge transfer and a lower rate of charge recombination 65 , 66 . The reason for this is that when the annealing temperature increases, the electrons present in the valence band acquire enough energy to move into the conduction band.…”

Section: Resultsmentioning

confidence: 99%

Investigating the physical and electrical properties of La2O3 via annealing of La(OH)3

Ismail,

Belal,

Abdo

et al. 2024

Sci Rep

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A simple technique was utilized to fabricate pure hexagonal La2O3 nanorods by utilizing lanthanum(III) nitrate hexahydrate (La(NO3)3·6H2O) and ammonia (NH4OH). The La2O3 nanoparticles were analyzed using XRD, TGA, Raman, SEM, FTIR, TEM, PL spectroscopy, and Mott–Schottky techniques. The XRD analysis confirmed the production of La(OH)3 nanorods under appropriate conditions, which were then successfully converted into La2O2CO3 and finally into La2O3 nanorods through annealing. The TGA analysis showed that the total weight loss was due to water evaporation and the dissolution of minimal moisture present in the environment. The FTIR analysis confirmed the presence of functional groups. The SEM analysis revealed changes in morphology. The TEM analysis to determine the particle size. The PL findings showed three emission peaks at 390, 520, and 698 nm due to interband transitions and defects in the samples. The Mott–Schottky analysis demonstrated that the flatband potential and acceptor density varied with annealing temperature, ranging from 1 to 1.2 V and 2 × 1018 to 1.4 × 1019 cm−3, respectively. Annealing at 1000 °C resulted in the lowest resistance to charge transfer (Rct).

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Section: Resultsmentioning

confidence: 99%

Investigating the physical and electrical properties of La2O3 via annealing of La(OH)3

Ismail,

Belal,

Abdo

et al. 2024

Sci Rep

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“…Some patterns show a shallow band at ~3300 cm −1 for hydroxyl groups owing to the absorbed water molecules on the surface of some of the samples. Additionally, the band at ~2200 cm −1 was attributed to the C=C group in the remaining traces of the extract [25]. For some of the samples calcined at 500 • C, there was a band centered at ~1000 cm −1 , which could be assigned to the bending of aromatic C-H or C-O-C remaining in the extract and disappeared when the samples were calcined at higher temperatures.…”

Section: Ft-ir Characterizationmentioning

confidence: 98%

“…Figure 1 shows the infrared spectra of the pristine CuO nanoparticles (100C) and pristine NiO nanoparticles (100N) and copper oxide-nickel oxide nanocomposites with different metal oxide ratios (75C25N, 50C50N, and 25C75N) calcined at three different temperatures: 500 • C, 700 • C, and 900 • C. Some patterns show a shallow band at ~3300 cm −1 for hydroxyl groups owing to the absorbed water molecules on the surface of some of the samples. Additionally, the band at ~2200 cm −1 was attributed to the C=C group in the remaining traces of the extract [25].…”

Section: Ft-ir Characterizationmentioning

confidence: 99%

The Effect of Composition on the Properties and Application of CuO-NiO Nanocomposites Synthesized Using a Saponin-Green/Microwave-Assisted Hydrothermal Method

Al-Yunus,

Al-Arjan,

Traboulsi

et al. 2024

IJMS

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In this study, we explored the formation of CuO nanoparticles, NiO nanoflakes, and CuO-NiO nanocomposites using saponin extract and a microwave-assisted hydrothermal method. Five green synthetic samples were prepared using aqueous saponin extract and a microwave-assisted hydrothermal procedure at 200 °C for 30 min. The samples were pristine copper oxide (100C), 75% copper oxide–25% nickel oxide (75C25N), 50% copper oxide–50% nickel oxide (50C50N), 25% copper oxide–75% nickel oxide (25C75N), and pristine nickel oxide (100N). The samples were characterized using FT-IR, XRD, XPS, SEM, and TEM. The XRD results showed that copper oxide and nickel oxide formed monoclinic and cubic phases, respectively. The morphology of the samples was useful and consisted of copper oxide nanoparticles and nickel oxide nanoflakes. XPS confirmed the +2 oxidation state of both the copper and nickel ions. Moreover, the optical bandgaps of copper oxide and nickel oxide were determined to be in the range of 1.29–1.6 eV and 3.36–3.63 eV, respectively, and the magnetic property studies showed that the synthesized samples exhibited ferromagnetic and superparamagnetic properties. In addition, the catalytic activity was tested against para-nitrophenol, demonstrating that the catalyst efficiency gradually improved in the presence of CuO. The highest rate constants were obtained for the 100C and 75C25N samples, with catalytic efficiencies of 98.7% and 78.2%, respectively, after 45 min.

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“…For example, Naveena et al [11] and Khudheir et al [12] readied La doped CuO and Mn doped CuO samples improved the absorption level and decrease the bandgap value of CuO from 1.62 to 1.49 eV and 2 to 1.91 eV. Siddiqui et al [13] prepared K doped CuO created oxygen vacancy defects and improved the conductivity of CuO. Promod et al added different concentration of Zn altered the structural and surface properties of CuO [14].…”

Section: Introductionmentioning

confidence: 99%

Improvement in photo-device properties of CuO thin films for opto-electronic applications: effects of (Ni, Co) co-doping

Gnanasekar¹,

Valanarasu²,

Ade³

et al. 2022

Phys. Scr.

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We report co-doping effects of transition metal elements (Ni, Co) primarily on the opto-electronic properties of CuO thin films. CuO, CuO:Ni(1%), CuO:Co(1%) and CuO:Ni(1%):Co(1%) thin films were deposited via the sprays pyrolysis route. Structural studies revealed the monoclinic CuO structure for all films. For all the films scanning electron microscope (SEM) images showed a crack-free and homogeneous surface. Photoluminescence (PL) spectra of all the films exhibited four emission peaks at 415, 451, 477, and 521 nm wavelengths. The optical bandgap (Eg) values were around 2.12 eV, 2.18 eV, 2.05 eV and 1.84 eV for CuO, CuO:Ni(1%), CuO:Co(1%) and CuO:Ni(1%):Co(1%) thin films, respectively. CuO:Ni(1%):Co(1%) photo-device displayed a large responsivity (R) of 0.43 AW-1, external quantum efficiency (EQE) of 100% and detectivity (D*) of 9.55x109Jones. Hence, co-doping of transition metal elements would be one of the effective approaches for enhancing opto-electronic properties of metal oxide compounds.

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Performance evaluation of optimized leaf-shaped two-dimension (2D) potassium doped CuO nanostructures with enhanced structural, optical and electronic properties

Cited by 27 publications

References 64 publications

Investigating the physical and electrical properties of La2O3 via annealing of La(OH)3

Investigating the physical and electrical properties of La2O3 via annealing of La(OH)3

The Effect of Composition on the Properties and Application of CuO-NiO Nanocomposites Synthesized Using a Saponin-Green/Microwave-Assisted Hydrothermal Method

Improvement in photo-device properties of CuO thin films for opto-electronic applications: effects of (Ni, Co) co-doping

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