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

作　　者：Gurushantha Kariyanna Surendra Boppanahalli Siddegowda Anantharaju Kurupalya Shivram Keshavamurthy Kempaiah 

机构地区：[1]Department of Chemistry,M S Ramaiah Institute of Technology,Bengaluru 560054,India [2]Department of Chemistry,Dayananda Sagar College of Engineering,Shavige Malleshwara Hills,Kumaraswamy Layout,Bengaluru 560111,India [3]Department of Physics,Vivekananda Institute of Technology,Bengaluru 560074,India

出　　处：《ChemPhysMater》2023年第2期148-154,共7页化学物理材料（英文）

摘　　要：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 evaluated.Powder 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 nm.The 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 eV.The photo-luminescence(PL)spectrum of the cubic-phase ZrO_(2) NPs presented a broad band in the UV-vis region.The 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 applications.The 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 electrolyte.Our 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 temperature.Furthermore,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 

分 类 号：TB383[一般工业技术—材料科学与工程]