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Your search keyword '"Hussain, O. M."' showing total 204 results
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204 results on '"Hussain, O. M."'

43. A powerful electrochemical sensor based on Fe3O4 nanoparticles-multiwalled carbon nanotubes hybrid for the effective monitoring of sunset yellow in soft drinks.

Author

Shaikshavali, P., Reddy, T. Madhusudana, Lakshmi Narayana, A., Hussain, O. M., Venkataprasad, G., and Venu Gopal, T.

Subjects
BEVERAGES, PATHOGENIC fungi, ELECTROCHEMICAL analysis, NANOCOMPOSITE materials, CARBON electrodes
Abstract

The investigation of synthetic dyes in beverages is significant, owing to their pathogenic and low toxicity a Fe3O4–MWCNTs electrochemical sensor was developed for the determination of sunset yellow (SY) in beverages. A simple one-step hydrothermal method was implemented for the synthesis of Fe3O4–MWCNTs nanocomposite. The structural and surface morphologies of Fe3O4–MWCNTs were studied using XRD, TEM, EDS and FE-SEM techniques. The synthesized nanocomposite showed cubic face centered Fe3O4 nanostructure with a probable crystallite size. The anchoring of Fe3O4 nanoparticles in MWCNTs were further conformed with TEM analysis. The FE-SEM analysis showed that the cubical shaped Fe3O4 nanoparticles were strongly anchored with an estimated granules size. The synthesized composite was utilized for the fabrication of sensitive and selective electrochemical sensor based on the drop casting of Fe3O4–MWCNTs composite on glassy carbon electrode (GCE) (Fe3O4–MWCNTs/GCE). The fabricated sensor was used for the quantification of SY. The sensor exhibited enhanced oxidation activity towards SY determination, by providing operational access to its determination in the field of food safety control. CV, DPV, and EIS techniques were utilized for the investigation of the electrochemical performance of SY. The influence of pH value of phosphate buffer solution (PBS) and effect of scan rate on the peak currents of SY were deliberated. The oxidation peak currents of SY were proportional to its concentrations in the range from 0.2 to 3.5 µM with a low limit of detection of 1.4 nM. The newly fabricated sensor exhibited good selectivity, stability, repeatability and reproducibility. Moreover, it was successfully applied for the detection of SY in soft drinks with acceptable recoveries. The developed sensor was viable with a good sensitivity and simple option for SY detection in the field of food safety. [ABSTRACT FROM AUTHOR]

Published
2020
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46. Facile and cost-effective synthesis of flower-like RGO/Fe3O4 nanocomposites with ultra-long cycling stability for supercapacitors.

Author

Rosaiah, P., Zhu, Jinghui, Hussain, O. M., and Qiu, Yejun

Abstract

The RGO/Fe3O4 nanocomposites were synthesized by an easy and cost-effective graphenothermal process during which GO and Fe2O3 were reduced to RGO and Fe3O4, thus forming the RGO/Fe3O4 nanocomposite. This material possesses high specific surface area of 141.3 m2 g−1 and average pore diameter of 5.8 nm. The RGO/Fe3O4 nanocomposites showed excellent electrochemical performance in supercapacitors (SCs). As a SC electrode, it exhibited an excellent specific capacitance (Cs) of 498 F g−1 at a scan rate of 10 mV s−1 and maintained 98.7% of capacitance retention at 500 mV s−1 over 5000 cycles. Moreover, it exhibited 94% of capacitance retention over 10,000 cycles at a current density of 3 A g−1. So, the developed RGO/Fe3O4 nanocomposite materials here hold high potential for energy storage applications. [ABSTRACT FROM AUTHOR]

Published
2019
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50. ENHANCED SUPERCAPACITIVE PERFORMANCE OF NANOCRYSTALLINE Mn3O4 SYNTHESIZED BY HYDROTHERMAL METHOD

Author

Shaika, Dadamiah PMD, Rosaiah, P, Hussain, O M, Shaika, Dadamiah PMD, Rosaiah, P, and Hussain, O M

Abstract

Mn3O4 nanoparticles have been successfully synthesized by a simple hydrothermal method at low temperatures. The processing conditions such as reaction temperature and time were optimized to synthesized phase pure nanocrystalline Mn3O4 with good electrochemical properties. The particles synthesized at a reaction temperature of 150°C for 12 h exhibited different characteristic peaks along with (211) predominant orientation which corresponds to tetragonal structure of Mn3O4 with space group I41/amd (141) and estimated crystallite size of 32 nm. The SEM analysis reveals that the octahedral shape of grains with an average grain size of 180 nm. The vibrational studies from Raman and FTIR measurements confirmed the microstructure and presence of Mn-O bonding. The conductivity of the product was increased with increasing temperature following the Arrhenius behavior with estimated activation energy of 0.37 eV. The supercapacitive performance of nanocrystalline Mn3O4 octahedrons in 1M Na2SO4 aqueous electrolyte exhibited a high specific capacitance of 348 Fg-1 at current density of 0.5 mAcm-2 and 70% capacitive retention even after 4000 cycles.

Published
2015

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