报告内容摘要：

Since the report of successful solution phase synthesis of iron-platinum (FePt) nanoparticles (NPs), various nanostructures based on FePt have been developed. The synthetic controls achieved in the syntheses make it possible to study FePt-based NPs for magnetic, catalytic and biomedical applications.

FePt NPs can be made in face centered cubic (fcc) structure that is superparamagnetic at room temperature. The fcc-FePt can be converted into face centered tetragonal (fct) structure that is strongly ferromagnetic. Using self-assembly and controlled thermal annealing, arrays of ferromagnetic fct-FePt NPs have been fabricated and shown great potentials for magnetic data storage and energy storage applications.  fcc-FePt NPs are chemically less stable than fct-FePt, releasing Fe in a low pH environment. The released Fe promotes hydrogen peroxide (H2O2) decomposition into reactive oxygen species (ROS) within cells, causing fast oxidation of cellular membrane. These fcc-FePt may function as a new type of therapeutic agent for imaging and controlled cancer therapy. The FePt-based NPs can be further used to catalyze various chemical reactions for energy applications. Using modified solution phase syntheses, we have synthesized a series core/shell FePt/Pt nanostructures in polyhedral or one dimensional nanowire shapes. These multimetallic alloy and core/shell NPs are excellent catalysts for oxygen reduction reaction and formic acid oxidation reaction. The activity and durability of these catalysts are controlled by their structure, shape and core/shell dimensions. These multimetallic NPs are promising as commercially viable catalysts for fuel cell and other energy device applications.

报告人简介：

Professor Sun received his Ph.D. degree in Chemistry from Brown University in 1996. He was a postdoctoral fellow from 1996-1998 and a research staff member from 1998-2004 at the IBM T. J. Watson Research Center. He joined the Chemistry Department of Brown University as a tenured Associate Professor in 2005 and was promoted to full Professor in 2007. He has been the Associate Director of Brown's Institute for Molecular and Nanoscale Innovation since 2008 and is currently an Associate Editor of Nanoscale.