AMA 2019 Speakers
Dr. Ganeshraja Ayyakannu Sundaram (Invited Speaker)
Dalian Institute of Chemical Physics, CAS, China
Title of Speech: Magnetic and Photocatalytic Behaviors of Single-Site Distorted Octahedral Iron(III) Oxide-Titania Nanoparticles
Abstract: The development of new materials and latest technologies is mainly focused on the improvement of their performances; less concern is inscribed in the development of more ecofriendly and low-cost synthetic procedures.1-4 A universal method for preparing distorted octahedral iron(III) oxide surface implanted on titania (FeO6:TiO2) nanoparticles (NPs) at first time, which are designed by a novel photochemical method. Different implanting level in FeO6:TiO2 NPs are prepared at dosage of visible light in terms of different irradiation times, in which visible light is mediated reduction of [Fe(bipy)2Cl2][FeCl4] precursor complex on TiO2 NPs surface. In combination with all the conventional techniques, the structure-activity relationships and photochemically formation of single-site FeO6:TiO2 NPs mainly explored by electron paramagnetic resonance, 57Fe Mössbauer spectroscopy and X-ray absorption fine structure. Such materials have behaved as soft ferromagnetic character at room temperature. The NPs are soft ferromagnetic, having their hysteresis loops in the range -5 kOe < H < +5 kOe with the specific magnetizations of (2.70 to 23.10) × 10-3 emu g-1 at room temperature. However, the magnetic property depends critically on oxygen vacancy, structural defects, chemical states of Fe and content. This strategy provides an alternative route to synthesize nanosized phase pure anatase x%FeO6:TiO2 NPs showing room temperature ferromagnetism. This work is expected to open up a general method for the synthesis of other transition-metal-surface implanted-metal oxide semiconductor with magnetic behavior.
Bio: Dr. A. S. Ganeshraja, Young Scientist in Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences from August, 2014. He was born in 1984. He received Ph.D degree in Chemistry from the Pondicherry University, India, in January 2014. He has published several research papers (35 no. current status) in Refereed International Journals and awarded the CAS President’s International Fellowship Initiative program in year 2015. He grants NSFC Research Fund for International Young Scientists funded by National Natural Science Foundation of China. Recently he has awarded TYSP-Talented Young Scientist Program fellowship for Assistant Researcher by China Science and Technology Exchange Center (CSTEC), Chinese Government in year 2019-2020. Currently, he is working on “Mössbauer Active Single Site Metal Oxide Coupled Photocatalysts”.