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Self-Assembly of Bowlic Supramolecules on Graphene Imaged at the Individual Molecular Level using Heavy Atom Tagging.
Kengmana, Everett S; Lee, Ja Kyung; Li, Xiang; Warner, Jamie H; Han, Grace G D.
Afiliación
  • Kengmana ES; Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA.
  • Lee JK; Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK.
  • Li X; Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA.
  • Warner JH; Materials Graduate Program, Texas Materials Institute, The University of Texas at Austin, 204 East Dean Keeton Street, Austin, TX, 78712, USA.
  • Han GGD; Department of Mechanical Engineering, University of Texas at Austin, 204 East Dean Keeton Street, Austin, TX, 78712, USA.
Small ; 16(39): e2002860, 2020 10.
Article en En | MEDLINE | ID: mdl-32870596
The self-assembly of bowlic supramolecules on graphene surface is studied with single molecular sensitivity. This is achieved by incorporating a heavy metal tag in the form of a single W atom into the tip of the molecular structure, which enables the direct imaging of molecular distribution using annular dark-field scanning transmission electron microscopy (ADF-STEM) along with graphene as an electron transparent support. The bowlic molecules have nonplanar geometry, and their orientations with respect to their graphene substrate and with each other result in various packing configurations. Statistical data on intermolecular distances is obtained from numerous measurements of the bright contrast from the single metal atom tags. The analysis shows that the bowlic molecules lie sideways on the graphene surface with favorable head-to-tail stacking, rather than sitting vertically with the bowl facing toward the graphene surface. In thicker film regions, nanoscale lamellar fringes are observed, demonstrating that large-scale aligned packing extends into 3D. Image simulations and various molecular packing schemes are discussed to help interpret the ADF-STEM images and the possible range of molecular interactions occurring. These results aid the understanding of nonplanar supramolecular assemblies on van der Waals surfaces for potential applications in molecular recognition by porous films.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Alemania