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Nanorod(GISAXS)-v4.pdf (2.09 MB)

Salt Mediated Self-Assembly of Poly(ethylene Glycol)-Functionalized Gold Nanorods

preprint
submitted on 09.09.2019 and posted on 11.09.2019 by Hyeong Jin Kim, Wenjie Wang, Wei Bu, Md. Mir Hossen, Alejandra Londono-Calderon, Andrew C. Hillier, Tanya Prozorov, Surya K. Mallapragada, David Vaknin
Although challenging, assembling and orienting non-spherical nanomaterials into two- and three-dimensional (2D and 3D) ordered arrays can facilitate versatile collective properties by virtue of their shape-dependent properties that cannot be realized with their spherical counterparts. Here, we report on the self-assembly of gold nanorods (AuNRs) into 2D films at the vapor/liquid interface facilitated by grafting them with poly(ethylene glycol) (PEG). Using surface sensitive synchrotron grazing incidence small angle X-ray scattering (GISAXS) and specular X-ray reflectivity (XRR), we 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.

Funding

DE-AC02-07CH11358

History

Email Address of Submitting Author

kimhj@iastate.edu

Institution

Iowa State University, Ames Laboratory

Country

U.S

ORCID For Submitting Author

0000-0001-9180-0430

Declaration of Conflict of Interest

No conflict of interest

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