title: Three-dimensional morphology of iron oxide nanoparticles with reactive concave surfaces. A compressed sensing-electron tomography (CS-ET) approach.
abstract: In this paper, we apply electron tomography (ET) to the study of the three-dimensional (3D) morphology of iron oxide nanoparticles (NPs) with reactive concave surfaces. The ability to determine quantitatively the volume and shape of the NP concavity is essential for understanding the key-lock mechanism responsible for the destabilization of gold nanocrystals within the iron oxide NP concavity. We show that quantitative ET is enhanced greatly by the application of compressed sensing (CS) techniques to the tomographic reconstruction. High-fidelity tomograms using a new CS-ET algorithm reveal with clarity the concavities of the particle and enable 3D nanometrology studies to be undertaken with confidence. In addition, the robust performance of the CS-ET algorithm with undersampled data should allow rapid progress with time-resolved 3D nanoscale studies, 3D atomic resolution imaging, and cryo-tomography of nanoscale cellular structures.
authors.affiliation: Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom. zsaghi@hotmail.com
authors.forename: Zineb
authors.initials: Z
authors.lastname: Saghi
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Holland
authors.forename: Rowan
authors.initials: R
authors.lastname: Leary
authors.forename: Andrea
authors.initials: A
authors.lastname: Falqui
authors.forename: Giovanni
authors.initials: G
authors.lastname: Bertoni
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Sederman
authors.forename: Lynn F
authors.initials: LF
authors.lastname: Gladden
authors.forename: Paul A
authors.initials: PA
authors.lastname: Midgley
mesh_terms: D044962:Data Compression / Q000379:methods; D055032:Electron Microscope Tomography / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide