title: Coordination Assembly of Discoid Nanoparticles.
abstract: Supramolecular chemistry utilizes coordination bonds to assemble molecular building blocks into a variety of sophisticated constructs. However, traditional coordination assemblies are based on organic compounds that have limited ability to transport charge. Herein, we describe coordination assembly of anisotropic FeS2 pyrite nanoparticles (NPs) that can facilitate charge transport. Zn(2+) ions form supramolecular complexes with carboxylate end-groups on NP surface, leading to multiparticle sheets with liquid-crystal-like organization. Conductivity and Hall carrier mobility of the p-type layered semiconductor films with Zn(2+) coordination bridging exceed those known for coordination compounds, some by several orders of magnitude. The nanoscale porosity of the assembled sheets combined with fast hole transport leads to high electrocatalytic activity of the NP films. The coordination assembly of NPs embraces the versatility of several types of building blocks and opens a new design space for self-organized materials combining nanoscale and supramolecular structural motifs.
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA).
authors.forename: Kenji
authors.initials: K
authors.lastname: Hirai
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA).|Department of Chemical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Gyeonggi-do, 449-728 (South Korea).
authors.forename: Bongjun
authors.initials: B
authors.lastname: Yeom
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA).
authors.forename: Shu-Hao
authors.initials: SH
authors.lastname: Chang
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, MI 48109 (USA).
authors.forename: Hang
authors.initials: H
authors.lastname: Chi
authors.affiliation: Electron Microbeam Analysis Laboratory, University of Michigan, Ann Arbor, MI 48109 (USA).
authors.forename: John F
authors.initials: JF
authors.lastname: Mansfield
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (USA).
authors.forename: Byeongdu
authors.initials: B
authors.lastname: Lee
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (USA).
authors.forename: Sungsik
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, MI 48109 (USA). cuher@umich.edu.
authors.forename: Ctirad
authors.initials: C
authors.lastname: Uher
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA). kotov@umich.edu.|Department of Materials Science and Engineering, Department of Biomedical Engineering, and Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109 (USA). kotov@umich.edu.
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Kotov
mesh_terms: D018625:Microscopy, Atomic Force / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D016062:Porosity
keywords: conductive materials; coordination bond; nanoparticles; supramolecular assemblies