title: Electron-induced Ti-rich surface segregation on SrTiO3 nanoparticles.
abstract: Atomic surface structures of nanoparticles are of interest in catalysis and other fields. Aberration-corrected HREM facilitates direct imaging of the surfaces of nanoparticles. A remaining concern of surface imaging arises from beam damage. It is important to identify the intrinsic surface structures and the ones created by electron beam irradiation in TEM. In this study, we performed aberration-corrected HREM and EELS to demonstrate that TiO and bcc type Ti islands form due to intense electron irradiation. The formation of Ti-rich islands is in agreement with previous high temperature annealing experiments on the surfaces of SrTiO3 single crystals.
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States. Electronic address: YuyuanLin2014@u.northwestern.edu.
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Electron Microscopy Center, Argonne National Laboratory, Argonne, IL 60439, United States.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Wen
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Linhua
authors.initials: L
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: James A
authors.initials: JA
authors.lastname: McCarthy
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Shichao
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Poeppelmeier
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States. Electronic address: L-marks@northwestern.edu.
authors.forename: Laurence D
authors.initials: LD
authors.lastname: Marks
keywords: Beam damage; HREM; Nanoparticles; Simulation; Strontium titanate; Surface structure