Chemical and Biological Engineering, Materials Science and Engineering, Physics and Astronomy, Neuroscience, Ames Laboratory
Research Focus Area
Advanced and Nanostructured Materials
Journal or Book Title
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.
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Kim, Hyeong Jin; Wang, Wenjie; Bu, Wei; Hossen, Md. Mir; Londono-Calderon, Alejandra; Hillier, Andrew C.; Prozorov, Tanya; Mallapragada, Surya; and Vaknin, David, "Salt Mediated Self-Assembly of Poly(ethylene Glycol)-Functionalized Gold Nanorods" (2019). Chemical and Biological Engineering Publications. 389.