Synthesis and characterization of Ca doped ZnO thin films by sol–gel method

Istrate, Anca-Ionela; Nastase, F.; Mihalache, Iuliana; Comănescu, Florin; Gavrıla, Raluca; Tutunaru, Oana; Romanițan, Cosmin; Ţucureanu, Vasilica; Nedelcu, Monica; Müller, Raluca

doi:10.1007/s10971-019-05144-7

Cited by 33 publications

(13 citation statements)

References 49 publications

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“…Adding donor or acceptor impurities to a semiconductor creates energy levels near the conduction or valence band edges, as seen for the Zn-Ca 1 and Zn-Ca 5 nanocomposites. This behavior is in agreement with that reported by various authors [31,32,42], and indicates that the incorporation of calcium ions to the material presents small variations in the energy of the forbidden band without generating modifications in the stability of ZnO. The antibacterial properties of the evaluated nanocomposite can be attributed to reactive oxygen species (ROS) [51,52] that inhibit bacterial growth because ZnO NPs release Zn 2+ ions that cross the cell wall and react with cytoplasmic content.…”

Section: Discussionsupporting

confidence: 90%

“…This behavior is due to the ionic size of the Ca 2+ ion, which is larger than the guest cation Zn 2+ [29]. The substitution of Ca 2+ with a larger radius in the Zn 2+ sites resulted in an increase in the size of the nanoparticle, which agrees with other investigations where the concentration of the dopant directly influenced the morphology and size of the nanoparticles [30][31][32][33][34].…”

Section: Discussionsupporting

confidence: 88%

“…The crystal size increased in proportion with the increase in the concentration of the dopant, except for the Zn-Ca5 material. This was due to saturation by the dopant, which generates a decrease in crystal size [31]. The lattice parameters were calculated using the Bragg's law equation, obtaining similar values for the parameters between the nanocomposites, which indicates that the incorporation of calcium ions does not modify the morphology and maintains the phase of the material [42].…”

Section: Discussionmentioning

confidence: 99%

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A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

Torres-Ramos

Martín-Camacho

González

et al. 2022

IJMS

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This study aimed to develop Ca2+ doped ZnO nanoparticles (NPs) and investigate their antibacterial properties against microorganisms of dental interest. Zn-Ca NPs were synthesized by the sol-gel method with different concentrations of Ca2+ (1, 3, and 5 wt. %) and subsequently characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-vis spectroscopy and Fourier transform infrared spectroscopy (FT-IR). The Kirby–Bauer method was used to measure antibacterial effects. NPs showed the wurzite phase of ZnO and bandgap energies (Eg) from 2.99 to 3.04 eV. SEM analysis showed an average particle size of 80 to 160 nm. The treatments that presented the best antibacterial activity were Zn-Ca 3% and Zn-Ca 5%. ZnO NPs represent an alternative to generate and improve materials with antibacterial capacity for dental applications.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

Torres-Ramos

Martín-Camacho

González

et al. 2022

IJMS

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“…The fabricated films have shown cracks and similar irregularities can be seen in micrographs. The formation of defects may be due to the drying of the material and the difference between the thermal expansion coefficients of the composite film and the bottom layer [37].…”

Section: Resultsmentioning

confidence: 99%

Performance Analysis of Calcium-Doped Titania (TiO2) as an Effective Electron Transport Layer (ETL) for Perovskite Solar Cells

et al. 2022

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Ca-doped TiO2 films were synthesized by the modified sol-gel method and employed as the electron transport material of perovskite solar cells (PSCs). Morphological, optoelectronic, thermal, and electrical studies of thin films were investigated through XRD, RAMAN, SEM, AFM, UV- Vis, FTIR, and IV characteristics. Ca doping was detected with the help of structural properties while morphological analysis revealed that thin films based on Ca-doped titania are crack-free, homogenous, and uniformly distributed. Further optoelectronic properties have shown a promising conversion efficiency of 9.79% for 2% Ca-doped titania followed by 1% Ca-doped titania, while 3% have shown the lowest conversion efficiency among these prepared samples. The 2% an optimized doping of Ca has shown an almost two-fold increase in conversion efficiency in comparison to pristine TiO2, along with an increase in current density from 15 mA cm−2 to 19.3 mA⋅cm−2. Improved energy efficiency and higher current density are attributed to faster electron transportation; moreover, the optimized percentage of Ca doping seems to be an effective approach to improve the PSCs’ performance.

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“…The process parameters can easily be controlled using the chemical bath deposition process, which make it an excellent method for the fabrication of nanorods. The doping of ZnO with a second group including magnesium, calcium, beryllium, and strontium elements has been considered as an effective technique to varying the structural, optical, and electrical properties of ZnO [24][25][26]. Majeed Gul [27] et al reported the band-gap tuning of ZnO nanorods by the addition of Mg from 3.18 eV to 3.32 eV.…”

Section: Introductionmentioning

confidence: 99%

Simulation, Analysis, and Characterization of Calcium-Doped ZnO Nanostructures for Dye-Sensitized Solar Cells

et al. 2020

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In this research article, the authors have discussed the simulation, analysis, and characterization of calcium-doped zinc oxide (Ca-doped-ZnO) nanostructures for advanced generation solar cells. A comparative study has been performed to envisage the effect of Ca-doped ZnO nanoparticles (NP), seeded Ca-doped ZnO nanorods (NR), and unseeded Ca-doped ZnO NR as photoanodes in dye-sensitized solar cells. Simulations were performed in MATLAB fuzzy logic controller to study the effect of various structures on the overall solar cell efficiency. The simulation results show an error of less than 1% in between the simulated and calculated values. This work shows that the diameter of the seeded Ca-doped ZnO NR is greater than that of the unseeded Ca-doped ZnO NR. The incorporation of Ca in the ZnO nanostructure is confirmed using XRD graphs and an EDX spectrum. The optical band gap of the seeded substrate is 3.18 eV, which is higher compared to those of unseeded Ca-doped ZnO NR and Ca-doped ZnO NP, which are 3.16 eV and 3.13 ev, respectively. The increase in optical band gap results in the improvement of the overall solar cell efficiency of the seeded Ca-doped ZnO NR to 1.55%. The incorporation of a seed layer with Ca-doped ZnO NR increases the fill factor and the overall efficiency of dye-sensitized solar cells (DSSC).

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Synthesis and characterization of Ca doped ZnO thin films by sol–gel method

Cited by 33 publications

References 49 publications

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

Performance Analysis of Calcium-Doped Titania (TiO2) as an Effective Electron Transport Layer (ETL) for Perovskite Solar Cells

Simulation, Analysis, and Characterization of Calcium-Doped ZnO Nanostructures for Dye-Sensitized Solar Cells

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