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Pollutants are continually being released into the land, water, and air around the world as a result of the high levels of human activity and urbanisation, which cause a rapid an increase in the growth of pollution. To meet the complex specifications needed for the separation of these contaminants regarding selectivity, sensitivity and limit of detection using various nanoparticles, researchers are modifying the electrodes using different nanoparticles. In this study, silver-doped magnesium oxide nanoparticles are prepared via sol–gel method and fabricated Ag-doped MgO-modified electrodes for investigating its electrochemical determination of resorcinol (RS) and RS degradation as measured with photocatalytic activity in the visible region. A number of characterization techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray dispersive spectroscopy (EDS), UV–Vis spectroscopy, XPS and Fourier transform infrared spectroscopy (FTIR) were used to confirm the optical properties, composition and morphology of synthesised Ag doped MgO nanoparticles. While the crystalline size of the synthesised nanoparticles was found to be 28 nm, the strong XRD peaks indicate the high crystallinity of the particles. The detection and quantification limits of the fabricated electrode are found to be 20.2 µM and 61.3 µM, respectively. The correlation value (R2) was ~ 0.99. Pure resorcinol exhibits a maximum absorption peak at 283 nm in its UV–visible spectrum. From the discoloration of resorcinol within 60 min, it can be shown that the synthesised material has a capability to degrade resorcinol effectively in the presence of sodium borohydride. The synthesised Ag-doped MgO nanoparticles degraded the RS with 98% efficiency. [ABSTRACT FROM AUTHOR]

This paper reports the prototype fabrication and characterization of microstrip patch antenna using the sol-gel derived composite nanoparticles of vanadium pentoxide oxide (V2O5) and zinc aluminate (ZnAl2O4). The prepared composite nanoparticles were characterized using X-ray diffraction (XRD), which exhibited the dominant peaks of ZnAl2O4 and V2O5. The crystallite size of the nanoparticles was estimated to be 16 nm. The sample was also studied using the Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), and energy dispersive spectroscopy (EDS) to examine the functional groups morphology and elemental composition present in the composite nanoparticles. Further, these nanoparticles were employed in fabricating the prototype microstrip patch antenna to evaluate its characteristics. The fabricated antenna showed its return loss of -17.13 dB at a resonant frequency of 4.64 GHz. [ABSTRACT FROM AUTHOR]

A cost effective and environmental friendly sol-gel autocombustion technique has been used to synthesize spinel ferrite nanoparticles of NixZn1-xFe2O4 (x = 0.0, 0.5 and 1.0). They were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX). While their magnetic properties have been measured at room temperature using a Magnetic Properties Measurement System (MPMS) quantum design magnetometer, the LCR meter (PSM 1735, NumetriQ 4th Ltd U.K.) has been used to study their dielectric properties with variable frequency in the range, 1 Hz-5 MHz. The XRD analysis suggests the presence of cubic spinel structure of ferrites with an average crystallite size of 45-79 nm. The dielectric constant and loss tangent of the samples show a normal dielectric behavior. The variation of dielectric behavior with the frequency is due to the Maxwell-Wagner type interfacial polarization and hopping of electrons between the Fe2+ and Fe3+ ions. The magnetic studies reveal that addition of Zn2+ drastically affects the magnetic properties. [ABSTRACT FROM AUTHOR]

In this work, the cubic spinel manganese‐zinc ferrite nanoparticle is synthesized by the sol–gel auto combustion method. It is the simple chemical route and low‐cost method for the formation of manganese zinc ferrite nanoparticles. Structural and morphological studies of the synthesized manganese‐zinc ferrite nanoparticles are done by X‐ray diffraction, Fourier transform infrared spectroscopy (FTIR), and scanning electron microsccopy (SEM). The X‐ray diffraction results indicate that the ferrite sample has a cubic spinel type structure with Fd3m space group. The average crystallite size of the synthesized manganese zinc ferrite nanoparticles is found to be 34 nm as determined by Debye–Scherrer equation. Two well‐known absorption bands at 467 and 558 cm−1, in FTIR spectroscopy data also confirm the cubic spinel structure in the prepared samples. Morphological studies by SEM exposed formation of largely agglomerated and well‐defined nanoparticles of the sample. From the magnetization data, parameters like magnetization, coercivity, remanance magnetization, and squareness ratio are calculated. [ABSTRACT FROM AUTHOR]