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ABSTRACT
In the present paper, aqueous extracts ofAlchemilla Vulgaris (Aslan Pençesi) leaves have been used to prepare Fe3O4 nano-flakes accompanied by calcination at 400°C. The various properties of biosynthesised Fe3O4 nano-flakes were investigated using UV–Visible, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-Ray diffraction (XRD), cyclic voltammetry, thermogravimetric (TG), and differential thermal analysis (DTA) respectively. The SEM study reveals the formation of flake-like structure with a diameter of 85 nm and a thickness of 9 nm respectively. The DTA curve shows two endothermic peaks corresponding to the decomposition of organic matter and the deoxidation of FeO (Wustite) to α-Fe, respectively, and their activation energy values were found to be 5.73 and 16.43 kJ/moles, respectively. The green synthesised magnetite nano-flakes is proved to be an excellent electrocatalyst for the electro-oxidation of ascorbic acid. The effect of scan rates, the concentration of the modifier, and the analyte was also investigated.
Acknowledgments
The authors gratefully acknowledge Bartın University Scientific Research Projects Unit, Turkey for providing financial support to conduct the research (Project number: 2019-FEN-A-006).
Conflicts of interest
No potential conflict of interest was reported by the author(s).
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Notes on contributors
Rajendrachari Shashanka
Dr. Shashanka Rajendrachari has obtained PhD in powder metallurgy from the Department of Metallurgical and Materials Engineering, National Institute of Technology Rourkela, India. He is currently working as an Assistant Professor, Department of Metallurgical and Materials Engineering, Bartin University, Turkey. He completed M.Sc in Industrial Chemistry, M.Tech in Nanoscience and Technology from Kuvempu University, Karnataka, India. He is the first recipient of the prestigious Powder Metallurgy Student of the Year award by Powder Metallurgy Association of India in the year 2015 at IIT Bombay. Recently awarded as prestigious “Young Scientist-2020” at the 4th International Scientist Awards ceremony on Engineering, Science and Medicine held at Chennai, India. He is experienced in preparing nano-structured stainless steel powders by powder metallurgy methods. He has a total of 7.5 years (Research/Teaching) experience and published 33 research articles and 2 books and 2 book chapters in various peer reviewed international journals. His areas of research are mechanical alloying, nanomaterials, corrosion, electrochemical sensors etc.
Gururaj Kudur Jayaprakash
Dr. Gururaj Kudur Jayaprakash is working as an Assistant Professor at the School of Advanced Chemical Sciences, Shoolini University, Himachal Pradesh, India. He also worked as a postdoc fellow at the MOE Key Laboratory of Organic OptoElectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, P.R. China. He completed his doctoral studies at the Department of Material Science, University of Guadalajara, Mexico with a CONACyT Ph.D. fellowship from the Government of Mexico. His research mainly aims to compute charge transfer kinetics using theoretical and electrochemical methods and simulating cyclic voltammograms.
Prakashaiah B.G
Dr. Prakashaiah B.G is currently working as an Assistant professor, Atria institute of technology, Bangalore, India. He has completed his Ph.D from National institute of technology karnataka, surathkal, India. He has 6 year of research experience on development of corrosion inhibitors for aluminium alloys, six papers have been published during research.
Mohan Kumar
Dr. Mohan Kumar has received his postgraduates in Industrial Chemistry in 2009 and Nanoscience and Technology in 2011 from Kuvempu University, India. He also received the Ph.D degree from the same University. Later, he worked in the Institute for Advanced Study, Shenzhen University as a Post-Doctoral Research Fellow from April 2019 to March 2021. His area of research is focused on the synthesis of composite nanomaterials, electrochemical and biosensors, electrode modification, and electropolymerization at Dr. Dion.
B.E Kumara Swamy
Prof. B.E. Kumara Swamy has obtained his Ph.D degree in Industrial Chemistry from Kuvempu University and Post-Doctoral Research Associate from Southern Methodist University, Dallas, Texas and University of Virginia, Virginia, USA. Presently working as, a Professor of Industrial Chemistry at Department of Post Graduate Studies in Industrial Chemistry, Kuvempu University. His research areas are Development of Electrochemical Sensor for some neurotransmitters, Biosensors, Nanosensors and Nanochemistry. He has published more than 282 research papers in peer-reviewed journals. He is in Associate Editor in Science Letters Journal, World Research Journal of Analytical Chemistry, Academic Editor to Journal of Chemistry, Advisory Board member in Biopublications and worked as Guest Editor in Special Issue on Nanoparticle and Cancer Treatment. He is a Fellow of American Chemical Society, Life Member of Indian Society of Analytical Scientists, SAEST member and ICC member. Presently, Chairman in Board of Studies in Dept of Industrial Chemistry, Kuvempu University and Research and Development Special Officer to Vice Chancellor of Kuvempu University Shankaraghatta, Karnataka, India.