Microstructure and blueshift in optical band gap of nanocrystalline AlxZn1−xO thin films

Khan, M.A. Majeed; Kumar, Sushil; Khan, M. Naziruddin; Ahamed, Maqusood; Dwayyan, A.S. Al

doi:10.1016/j.jlumin.2014.06.007

Cited by 50 publications

(10 citation statements)

References 46 publications

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“…As shown in Figure 1A, the absorption spectrum of SnO 2 NP ranges from 200 to 700 nm. The formula calculates the absorption coefficient (α) of SnO 2 NP: α = A/d (A: absorbance, d: cuvette thickness) (Khan et al, 2014). According to the formula: (αhν) = A (hν−Eg) (where hν is the photon energy, A is a constant that does not depend on the photon energy), the absorption coefficient α was used to make Tauc plots (Khan et al, 2017).…”

Section: Physicochemical Characterization Of Sno 2 Npmentioning

confidence: 99%

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

et al. 2020

Front. Bioeng. Biotechnol.

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Objective: To explore the effects of SnO 2 nanoparticles (NPs) on proliferation, invasion, apoptosis, and oxidative stress of oral cancer. Methods: SnO 2 NPs were prepared and characterized. Oral cancer cell lines CAL-27 and SCC-9 were cultured in vitro. We detected the effects of various concentrations of SnO 2 NPs (0, 5, 25, 50, 100, 200 µg/mL) on the proliferation of oral cancer cells, and observed the morphological changes, and measured the cells ability of migration, invasion and apoptosis condition, and the levels of oxidative stress were measured by detecting malondialdehyde (MDA) and reactive oxygen species (ROS). Besides, we also measured the changes of mRNA and protein levels of factors related to cell proliferation, migration, invasion, apoptosis, and oxidative stress. Results: SnO 2 NPs inhibited the proliferation of oral cancer cells in a concentrationdependent manner (all P < 0.05). And SnO 2 NPs treatment could reduce the migration and invasion ability of cells (all P < 0.05), induce apoptosis, and those effects were better when treated for 48 h than 24 h (all P < 0.05). And SnO 2 NPs could induce oxidative stress in cells (all P < 0.05). Besides, the concentrations of cyclin-D1, C-myc, matrix MMP-9, and MMP-2 in SnO 2 NPs treated group was decreased (all P < 0.05), and the expression levels of cleaved Caspase-3, cleaved Caspase-9, and Cytochrome C were increased (all P < 0.05). Conclusion: In the present study, we found that SnO 2 NPs could play a cytotoxic role in oral cancer cells, and inhibit cell proliferation, migration, and invasion, and induce oxidative stress and apoptosis, which suggests that SnO 2 NPs may have the effects of anti-oral cancer. However, a more in-depth study is needed to determine its roles.

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Section: Physicochemical Characterization Of Sno 2 Npmentioning

confidence: 99%

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

et al. 2020

Front. Bioeng. Biotechnol.

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“…[ 22 ] The shifting of absorption coefficient signifies the alteration of bandgap energy. The blueshift of α corresponds to the increase of optical bandgap, [ 24 ] which was verified by the bandgap analysis of the prepared samples. The absorption coefficients have also slightly increased after ZnS addition.…”

Section: Resultsmentioning

confidence: 66%

One‐Step Synthesis of (CH₃NH₃)₂CuCl₄:ZnS Thin Film for Optoelectronic Applications

Ahmed

Islam

Bashar

et al. 2022

Crystal Research and Technology

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Improving device performance and reducing Pb-toxicity is one of the fundamental issues of perovskite-based optoelectronic technology. This research demonstrates the synthesis and characterization of pure and ZnS incorporated Cu-based organic-inorganic perovskite via the precursor blending method. The thin films of the perovskites are deposited via one-step spin coating method. X-ray diffraction of all the films reveals the cubic phase where a decrease of cell volume is observed after ZnS addition. The average grain size also reduces after ZnS incorporation that is found from scanning electron microscopy analysis. The absorption coefficient of the films is of the order of 10 3 cm −1 in low wavelength range while a blueshifting of the absorption peak is seen due to ZnS addition. The overall resistance of the film increased with increasing ZnS concentration. An increasing bandgap from 2.3 to 2.4 eV is observed for different ZnS concentrations.

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“…There are no obvious differences in TiO 2 crystallite size in all Ag-TiO 2 -Fe composite thin films with the increase of silver content, and these findings are in good agreement with the literature. [2,43] The crystallite size of TiO 2 determined using the Scherrer's formula [44] on (101) diffraction peak was estimated about 33 nm.…”

Section: Xrd Analysismentioning

confidence: 99%

Synthesis, Characterization, and Antibacterial Activity of Ag–TiO₂–Fe Composite Thin Films

Grine

Akkari

Fernández

et al. 2022

Physica Status Solidi (a)

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Ag–TiO2–Fe composite thin films with different Ag contents are deposited onto a glass substrate by a thermal evaporation method. TiO2, TiO2–Fe, and Ag–TiO2–Fe thin films are characterized by X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), UV–vis–NIR spectroscopy, and photoluminescence (PL) to study the relation between their structural, morphological, optical, and luminescent properties with their antibacterial activities. XRD and Raman measurements show the formation of the anatase phase with increasing silver content in Ag–TiO2–Fe composite thin films. SEM images show the presence of silver in the metallic form. Optical measurements display a redshift in the optical absorption edge of TiO2–Fe and Ag–TiO2–Fe composite films with a decrease in the energy bandgap compared to pure TiO2. The antibacterial activity of the films against Escherichia coli is investigated both in the dark and under UV light. It is found that Ag plays a major role on the antibacterial efficiency in the dark. Ag–TiO2–Fe composite thin films exhibit a synergistic antibacterial effect under UV light, resulting an excellent antibacterial coating.

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Microstructure and blueshift in optical band gap of nanocrystalline AlxZn1−xO thin films

Cited by 50 publications

References 46 publications

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

One‐Step Synthesis of (CH₃NH₃)₂CuCl₄:ZnS Thin Film for Optoelectronic Applications

Synthesis, Characterization, and Antibacterial Activity of Ag–TiO₂–Fe Composite Thin Films

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Microstructure and blueshift in optical band gap of nanocrystalline AlxZn1−xO thin films

Cited by 50 publications

References 46 publications

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

Stannic Oxide Nanoparticle Regulates Proliferation, Invasion, Apoptosis, and Oxidative Stress of Oral Cancer Cells

One‐Step Synthesis of (CH3NH3)2CuCl4:ZnS Thin Film for Optoelectronic Applications

Synthesis, Characterization, and Antibacterial Activity of Ag–TiO2–Fe Composite Thin Films

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One‐Step Synthesis of (CH₃NH₃)₂CuCl₄:ZnS Thin Film for Optoelectronic Applications

Synthesis, Characterization, and Antibacterial Activity of Ag–TiO₂–Fe Composite Thin Films