Nanocrystalline Ni–Zn spinel ferrites: size-dependent physical, photocatalytic and antioxidant properties

Abstract

The physical properties of nanomagnetic particles are expected to be highly dependent on their size. In this study, besides the promising applications of nanocrystalline Ni-Zn spinel ferrites in the area...

Cobalt-substituted ZnS QDs: a diluted magnetic semiconductor and efficient photocatalyst

“…A XRD pattern obtained from the bulk LaH 6 powder was considered as a reference for both the peak position calibration and removal of instrumental broadening effects. 16,21 The diffracted (111) peak having the highest intensity was used to evaluate the mean size of the nanocrystallites. This (111) peak was fitted with the Gaussian curve to calculate the full width at half maxima (FWHM) of the peak.…”

“…The obtained values of FWHM were further used to determine the mean crystallite size for each sample using Scherrer's formula. 13,16 After eliminating the instrumental broadening, the FWHM of the most intense (111) peak was used to calculate the average crystallite size ( D ) of all the QD samples using Scherrer's formula as follows: 16–21 where λ is the wavelength (1.5406 Å) of copper K α X-ray line, θ represents Bragg's diffraction angle and β corresponds to the FWHM of the (111) peak respectively. The calculated values of mean crystallite size were found in the range of 1.1 ± 0.1 nm for all the QD samples, as shown in Table 1.…”

“…16,25 The captured SAED pattern also revealed the fcc-like cubic zinc blende crystal structure of the prepared nanomaterial. 21…”

“…A xenon lamp was used to irradiate the solutions in order to provide energy. 2,21–23 Using a syringe, sample aliquots were collected from the solution at predetermined intervals, and the drug concentration was subsequently measured by spectrophotometry after centrifugation. After exposure to radiation for a specific amount of time, the decrease in absorbance (at max = 270 nm) for drug samples showed the rate of degradation and, consequently, the effectiveness of the drug oxidation and photocatalytic effect of QDs.…”

“…After exposure to radiation for a specific amount of time, the decrease in absorbance (at max = 270 nm) for drug samples showed the rate of degradation and, consequently, the effectiveness of the drug oxidation and photocatalytic effect of QDs. The degradation efficiency in percentage (%) was obtained using the following equation: 21–23 where C 0 is the initial CIP concentration and C is the concentration of CIP solution at a specific time t after the xenon light irradiation. Similarly, both A 0 and A t denote the initial and final absorbance of the CIP-containing solution obtained at the peak position ( λ = 270 nm) of the highest absorbance.…”