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

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2019-12-30
Authors
Kim, Hyeong Jin
Wang, Wenjie
Bu, Wei
Hossen, Md. Mir
Londono-Calderon, Alejandra
Hillier, Andrew
Mallapragada, Surya
Prozorov, Tanya
Mallapragada, Surya
Vaknin, David
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Ames LaboratoryPhysics and AstronomyNeuroscienceMaterials Science and EngineeringChemical and Biological Engineering
Abstract

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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This article is published as Kim, Hyeong Jin, Wenjie Wang, Wei Bu, Md Mir Hossen, Alejandra Londono-Calderon, Andrew C. Hillier, Tanya Prozorov, Surya Mallapragada, and David Vaknin. "Salt Mediated Self-Assembly of poly (ethylene glycol)-functionalized Gold nanorods." Scientific Reports 9, no. 1 (2019): 1-9. DOI: 10.1038/s41598-019-56730-2. Posted with permission.

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