title: Three-dimensional electron density mapping of shape-controlled nanoparticle by focused hard X-ray diffraction microscopy.
abstract: Coherent diffraction microscopy using highly focused hard X-ray beams allows us to three-dimensionally observe thick objects with a high spatial resolution, also providing us with unique structural information, i.e., electron density distribution, not obtained by X-ray tomography with lenses, atom probe microscopy, or electron tomography. We measured high-contrast coherent X-ray diffraction patterns of a shape-controlled Au/Ag nanoparticle and successfully reconstructed a projection and a three-dimensional image of the nanoparticle with a single pixel (or a voxel) size of 4.2 nm in each dimension. The small pits on the surface and a hollow interior were clearly visible. The Au-rich regions were identified based on the electron density distribution, which provided insight into the formation of Au/Ag nanoboxes.
authors.affiliation: Frontier Research Base for Global Young Researchers, Frontier Research Center, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan. takahashi@wakate.frc.eng.osaka-u.ac.jp
authors.forename: Yukio
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Zettsu
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Nishino
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Tsutsumi
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Matsubara
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Kazuto
authors.initials: K
authors.lastname: Yamauchi
mesh_terms: D021621:Imaging, Three-Dimensional / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008854:Microscopy, Electron / Q000379:methods*; D008968:Molecular Conformation; D049329:Nanostructures / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D046911:Macromolecular Substances