A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

Rahimnejad, Sara; Setayesh, Shahrbanoo Rahman; Gholami, Mohammad Reza

doi:10.1007/bf03245990

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…The UV-visible spectra of copper oxide samples exhibit a broad absorption peak in the range of 400-600 nm as shown in figure 2A. The plot of absorbance vs. wavelength shows a shift in the spectra towards longer wavelength as a function of decreasing particle size (quantum size effect), these results are in agreement with those of XRD analysis discussed earlier [35,36]. The Kubelka-Munk method was employed to estimate the theoretical band gap energies of the copper oxide nanoparticles [37].…”

Section: Uv-visible Analysissupporting

confidence: 88%

Precursor-dependent structural properties and antibacterial activity of copper oxide

et al. 2018

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Inorganic metal oxide nanoparticles of zinc, copper and iron have been widely studied for their use in biomedical research due to their novel physical, chemical and biological properties. Present work involves studies on copper oxide nanoparticles for their antibacterial activity. Copper oxide (CuO) nanoparticles were synthesized by template-free hydrothermal synthesis using different precursors of copper (nitrate, acetate, chloride and sulphate). The samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis, ultraviolet-visible (UV-Vis) absorption spectroscopy, scanning electron microscopy (SEM) and zeta potential analysis. The XRD patterns of the synthesized samples show presence of (−111) and (111) planes, which can be assigned to the monoclinic phase of CuO with the average crystallite size ranging between 43 and 49 nm. The SEM reveals rod-shaped morphology of the samples with a broad size distribution. The optical band gap calculated by UV-Vis absorption study ranges between 1.35 and 1.38 eV. The highly negative zeta potential values of the CuO synthesized with nitrate (−23.78 ± 0.95 mV), acetate (−11.86 ± 1.06 mV) and sulphate (−22.33 ± 0.85 mV) precursors of copper reveal the good colloidal stability of the synthesized particles. While CuO synthesized with copper (II) chloride shows intermediate stability with the zeta potential as 9.40 ± 1.86 mV. The antibacterial activity of the synthesized CuO was studied against human pathogens like Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacterial strains, which are proved to be efficient and precursor-dependent. The minimum inhibitory concentration of CuO against E. coli and S. aureus were found to be 0.15 and 0.1 mg ml −1 , respectively. CuO nanoparticles exhibit good antibacterial activity, hence, it has potential for biomedical applications in preventing and treating infections.

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Section: Uv-visible Analysissupporting

confidence: 88%

Precursor-dependent structural properties and antibacterial activity of copper oxide

et al. 2018

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“…One is that the aggregation of smaller crystallites forms smaller pores. The other is that some ions of doping probably insert into the pore of pure TiO 2 , which also causes pore size to become smaller [34]. The specific surface area determined with the BET method is 80.03 m 2 g −1 which is higher than 47.03 m 2 g −1 of TiO 2 sample.…”

Section: Tem Analysis Of Sn/tiomentioning

confidence: 89%

Photocatalytic Decomposition of Amoxicillin Trihydrate Antibiotic in Aqueous Solutions under UV Irradiation Using Sn/TiO₂Nanoparticles

Mohammadi

Massoumi

Rabani

2012

International Journal of Photoenergy

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TiO 2 and Sn/TiO 2 nanoparticles were successfully synthesized by sol-gel method. The resulting nanoparticles were characterized by XRD, TEM, SEM, UV-Vis reflectance spectroscopy, and BET analysis methods. The effects of Sn-doping on the crystal structure, surface area, adsorption properties, pore size distribution, and optical absorption properties of the catalysts were investigated. The effect of different Sn content on the amount of hydroxyl radical was discussed by using salicylic acid as probe molecule. The photocatalytic activity of samples was tested by photocatalytic mineralization of amoxicillin trihydrate (AMOX) as a model pollutant. Sn/TiO 2 nanoparticles exhibited high photocatalytic activity during the mineralization of AMOX under UV light due to increase in the generated hydroxyl radicals, band gap energy, specific surface area, and decrease in the crystallite size. The kinetic of the mineralization of AMOX can be explained in terms of the Langmuir-Hinshelwood model. The values of the adsorption equilibrium constant (K AMOX) and the kinetic rate constant of surface reaction (k c) were 0.56 (mg L −1) −1 and 1.86 mg L −1 min −1 , respectively.

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“…ZnO thin films are widely used to light-emitting diodes (LED) [4], UV sensors [5,6], solar cells [7,8], surface acoustic wave (SAW) devices and optical wave-guide devices as well [9]. It is well known that ZnO thin films can be prepared by variety of techniques such as sputtering [10,11], laser ablation [12][13][14], chemical vapor deposition [15,16] and sol-gel spin-coating technique [17][18][19][20][21]. Among the above techniques, sol-gel spin-coating technique is relatively appealing and commercially favorable for the preparation of highly-oriented ZnO thin films because of its low cost, well control over the chemical composition of the thin film, the capability of preparing large-size homogeneous thin film and large freedom of choosing dopant as well.…”

Section: Introductionmentioning

confidence: 99%

Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique

Wang

Gao

et al. 2016

Acta Phys. Pol. A

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Highly-oriented ZnO thin films prepared by using low-cost technique such as sol-gel technique are of much importance to ZnO-based white light-emitting diodes. The chose of proper preheating temperature in sol-gel technique is still critical for highly-oriented ZnO thin film so far. The mechanisms for the preheating in the formation of ZnO thin film and for the reactions involved in the sol solution have not been clearly stated yet. Thus, in this work, the highly-oriented ZnO thin films were prepared on glass substrates by using sol-gel spincoating technique. The sol solution was prepared by using the two-step method rather than usual one-step method, which facilitates the understanding of the mechanism for the reactions involved in the sol solution. The effect of the preheating temperature on the microstructure and the optical properties of the films were in particular investigated. The mechanisms for the preheating in the formation of the films and for the reactions involved in the sol solution prepared by the two-step method were also proposed in terms of the experimental results. The preheating not only enhances the volatilization of the solvent 2-methoxyethanol and the decomposition of the residual organic species, but also results into the formation of small number of ZnO particles. The preheating temperature of 300• C is most favorable for the highly-oriented ZnO thin film. Increasing the preheating temperature results into the blue shift of the absorption edges of the films. This can be explained by using the quantum-size effect. The photoluminescence spectra of the films show an UV emission at the near-band edge and a broad green-yellow emission at 470-620 nm. The former is closely related to the excitons, while the latter is to the intrinsic defect species in the film.

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A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

Cited by 21 publications

References 19 publications

Precursor-dependent structural properties and antibacterial activity of copper oxide

Precursor-dependent structural properties and antibacterial activity of copper oxide

Photocatalytic Decomposition of Amoxicillin Trihydrate Antibiotic in Aqueous Solutions under UV Irradiation Using Sn/TiO₂Nanoparticles

Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique

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A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

Cited by 21 publications

References 19 publications

Precursor-dependent structural properties and antibacterial activity of copper oxide

Precursor-dependent structural properties and antibacterial activity of copper oxide

Photocatalytic Decomposition of Amoxicillin Trihydrate Antibiotic in Aqueous Solutions under UV Irradiation Using Sn/TiO2Nanoparticles

Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique

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Photocatalytic Decomposition of Amoxicillin Trihydrate Antibiotic in Aqueous Solutions under UV Irradiation Using Sn/TiO₂Nanoparticles