Self-Assembly of Poly(ethylene glycol)-Functionalized Gold Nanorods at the Vapor/Liquid Interface

ORAL

Abstract

Using surface sensitive synchrotron X-ray diffraction, we report on the self-assembly of gold nanorods (AuNRs) into 2D films at the vapor/liquid interface. The films are facilitated by grafting the AuNRs with poly(ethylene glycol) (PEG). Grazing incidence small angle X-ray scattering (GISAXS) and specular X-ray reflectivity (XRR), show that PEG-AuNRs in aqueous suspensions migrate to the vapor/liquid interface in the presence of salt, forming a uniform monolayer with planar-to-surface orientation. Furthermore, the 2D assembled PEG functionalized AuNRs exhibit short range order into rectangular symmetry with side-by-side and tail-to-tail nearest-neighbor packing. The effect of PEG chain length and salt concentration on the 2D assembly are also reported.

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Presenters

  • Hyeong Jin Kim

    Ames Laboratory, Iowa State University, Ames laboratory, Iowa State University

Authors

  • Hyeong Jin Kim

    Ames Laboratory, Iowa State University, Ames laboratory, Iowa State University

  • Wenjie Wang

    Ames Laboratory, Iowa State University, Ames laboratory, Iowa State University

  • Wei Bu

    Institute of Molecular Engineering, University of Chicago, University of Chicago, ChemCARS, The University of Chicago

  • Surya Mallapragada

    Ames Laboratory, Iowa State University, Ames laboratory, Iowa State University

  • David Vaknin

    Ames Laboratory, Iowa State University, Ames Laboratory, Ames laboratory, Iowa State University