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Helianthus-annuus assisted synthesis of ZrO_(2) nanoparticles:Enhanced electrochemical,photoluminescent,and optical properties

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ChemPhysMater 2023年第2期2卷 148-154页

作者： Gurushantha Kariyanna surendra boppanahalli siddegowda Anantharaju Kurupalya Shivram Keshavamurthy Kempaiah Department of Chemistry M S Ramaiah Institute of TechnologyBengaluru 560054India Department of Chemistry Dayananda Sagar College of EngineeringShavige Malleshwara HillsKumaraswamy LayoutBengaluru 560111India Department of Physics Vivekananda Institute of TechnologyBengaluru 560074India

Cubic-phase ZrO_(2) nanoparticle(NPs)were synthesized using a cost-effective single-pot green combustion method and Helianthus annuus extract,and their properties were *** X-ray diffraction was used to inves-tigate the purity,crystal structure,and size of the NPs,and the average size of the NPs was determined to be∼25 *** internal surface morphology of the NPs with distinct voids and pores were observed using scanning electron microscopy(SEM)Ultraviolet-visible(UV-vis)absorption spectroscopy was used to analyze the optical properties of the as-synthesized ZrO_(2) NPs,and their energy bandgap was determined to be 4.5 *** photo-luminescence(PL)spectrum of the cubic-phase ZrO_(2) NPs presented a broad band in the UV-vis *** PL emission properties of the ZrO_(2) NPs were studied by analyzing their emission wavelength at∼490 nm,and the results revealed that the NPs can be efficiently used for display *** electrochemical properties of a graphite-ZrO_(2) NP electrode was qualitatively analyzed by performing cyclic voltammetry(CV)and electrochem-ical impedance spectroscopy experiments in a three-electrode system with a 0.1 M KCl solution as the *** results suggested that the NPs can be used to evaluate the thermodynamics of the redox reaction,and their capacitance was determined using the CV curves of a graphite-ZrO_(2) working electrode at different scan rates in the range of 0.01∼0.05 V/s at room ***,the photodegradation rate of Reactive Blue 4 textile dye over the as-prepared ZrO_(2) NPs reached 97%under UV-vis light irradiation.

关键词： ZrO_(2)NPs Helianthus annuus extract Photoluminescence Photocatalytic activity

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Almond gum assisted synthesis of Mg doped Fe_(2)O_(3) NPs:Structural analysis,electrochemical sensing,and optical applications

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ChemPhysMater 2022年第4期1卷 330-337页

作者： Madanakumara Hanumanthappa Jayanna Halepoojar Siddalingappa Yellamagad Channabasaveshwara Soundeswaran Sundararajan Mruthyunjaya Vishwas Shyamala Kurki Srinivasaiah surendra boppanahalli siddegowda Basavaraju Nandeesh Department of Physics Dr Ambedkar Institute of TechnologyBangalore 560056India Department of Physics Kuvempu UniversityShankaraghatta Shimoga 577451India Yellamagad Channabasaveshwara c Soundeswaran Sundararajan Mruthyunjaya Vishwas e Shyamala Kurki Srinivasaiah fSurendra Boppanahalli Siddegowda School of Physics and Geology Nrupathunga UniversityBangalore 560001India Department of Physics Mount Carmel CollegeBangalore 560001India Department of Chemistry Dayananda Sagar College of EngineeringBengaluru 560078India Department of Physics East West Institute of TechnologyBangalore 560091India

Mg-doped Fe_(2)O_(3)nanoparticles(M-FNPs)are successfully prepared first time by facile green-aided(almond gum)combustion *** structural analysis of synthesized nanoparticles was well analyzed by Powder X-ray Diffrac-tion(PXRD),Fourier Transform Infrared spectroscopy(FT-IR),Scanning Electron Microscope(SEM),Raman spec-troscopy and UV-Visible spectral *** showed a nanocrystalline nature and determined the average particle size to be 85 *** surface morphologies of the prepared nanocomposite was measured by SEM tech-nique reveals the porous and spongy like *** photodegradation activity on 20×10^(−6)of Fast Orange Red(FOR)organic model dye using M-FNPs(50 mg)under UV light irradiation was investigatedin ***-trochemical examination of the prepared material was conducted using graphite-M-FNP electrode paste in 0.1 M KCl solution,and its performance in redox reaction was determined to be very good via cyclic voltammetry and electrochemical impedance ***,an extension to sensor studies revealed broad differences in redox positions for paracetamol sensors,at 0.64 V and 0.41 V,confirming highly chemical sensor activity in alkaline medium for 1∼5 mM concentrations.

关键词： Mg doped Fe_(2)O_(3)photocatalyst Green combustion Electrochemical analysis Photocatalysis

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