Temperature-induced self-assembly and crystallization of gold nanorods

ORAL

Abstract

We report on temperature-induced and improved assembly and crystallization of gold nanorods (AuNRs) that are grafted with polye(ethylene glycol) (PEG) in electrolytic suspensions. Small angle X-ray scattering (SAXS) reveals that elevating the temperature of dispersed PEG-AuNRs suspensions in the presence of electrolytes or poly-electrolytes spontaneously induces the assembly of the AuNRs into hexagonal superlattices. Surprisingly, we find that the lattice constant of the crystalline AuNRs significantly decreases and crystal quality improves by increasing the temperature of the suspensions. Implications of the results for engineering new nanomaterials are discussed.

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Supported by U.S. Department of Energy (U.S. DOE), Office of Basic Energy Sciences, Contract DE-AC02-07CH11358.

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Presenters

  • David Vaknin

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

Authors

  • David Vaknin

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

  • 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

  • Alex Travesset

    • Iowa State University
    • Ames Lab
    • Department of Physics and Astronomy, Iowa State University
    • Physics and Astronomy, Iowa State University and Ames Lab
    • Ames Laboratory, Iowa State University

  • Surya Mallapragada

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