题目：Template fabrication of hybrid nanoporous arrays and their magneto-plasmon properties
报告人：宋玉军
北京科技大学教授、博士生导师
时间：2014年12月15日（周一）上午10:30 a.m.
地点：国家脉冲强磁场科学中心C204
报告摘要：
Hybridization of nanoarchitectures opens the new area for nanoparticles (NPs) with multi-functions and novel physicochemical properties. We developed template (nanopores or nanosphere) assisted physical vapor deposition to fabricate ordered multi-layered magneto-plasmon nanostructures using Ag/dielectrics/CoFeB/dielectrics/Ag nano-structural arrays as examples. The structure parameters dependent localized surface plasmon resonance (LSPR) and magnetic properties of these nanostructures are investigated. It is found that tunable multiple LSPR absorbance peaks can be obtained by adjusting the feature size, the nter-structure spacing and the thickness of each layer. LSPR intensity and shape resonance can be tuned nonlinearly by the pore size, the dielectric properties of inter dielectric layers and the thickness of the Ag layers. These multi-layered nanostructures have distinct magnetic anisotropy, which are easier to saturate at the direction parallel to the external magnetic field. The adding of Ag makes the saturation magnetization of nanostructure films decrease, and the coercive force of various structural films increase. The coercive force and the magnetic bias for the nano-structural arrays perpendicular to the external magnetic field are larger than those parallel to the external magnetic field. The correlation of the magneto-optical Kerr or Faraday effects and the structure of the hybrid nanostructures are further investigated. Studies on these nanohybrids are fundamentally crucial for high sensitivity magneto-plasmon sensing systems, such as optical transistor, circular isolator, active waveguides and gratings, and magnetic field sensors.
报告人简介：
Dr. Song has been worked at Center for Advanced Microstructures and Devices jointing with Pennington Medical Research Center at Louisiana State University, Applied Research Center at Old Dominion University and Jefferson Lab in Virginia of USA, as Research Associate, after he obtained his Ph D in Materials Science and Engineering in 2000. His areas are focusing in Fabrication of Micro and Nano Materials and Structures and their Instrumentation for sensing system and controlled synthesis process. He contributes significantly in the fabrication of magnetic and/or optical nanomaterials for ultra-sensitive magnetic units, and bio-functinalization of these nanomaterials as smart bioprobes.
He invented the semi-solid sealing process in microfabrication and developed sequence kinetics controlled microfluidic processes (SKCMFR) for the controlled synthesis of nanomaterials. Lot of types of nanoparticles (NPs) with controlled sizes, shapes, crystal structures and properties (such as Fe, Co, Fe3O4, Co@Au, Fe@Cu) have been successfully synthesized by the novel SKCMFR process. He also developed one new functionalization process of NPs to reduce the non-specific absorption by introducing single NP probes and stable hydroxyl groups, to improve the specific targeting by controlled introducing the binding sites in individual NPs. This process resolves the tough key issue in the finctionalization of NPs. At the same time, he developed a methodology to correlate the localized surface plasmonic resonance of single nano-optics with their local surface morphologies and realized the detection of near fields by the far field devices for remote monitoring the signal transducer in EM fields ignited by the changes of molecule properties, which has been used in the cell imaging and interaction investigation of biomolecules in vivo. In addition, he has been organizing the project on the fabrication of nanocrystalline materials with giant magneto-impedance micro-magnetic sensor and its application for geomagnetic navigation and has achieved much progress.
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