Salt Mediated Self-Assembly of Poly(ethylene Glycol)-Functionalized Gold Nanorods
| Autor: | Alejandra Londono-Calderon, Md. Mir Hossen, Surya K. Mallapragada, David Vaknin, Tanya Prozorov, Hyeong Jin Kim, Wenjie Wang, Wei Bu, Andrew C. Hillier |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
lcsh:Medicine 02 engineering and technology 010402 general chemistry 01 natural sciences Article Nanomaterials 03 medical and health sciences chemistry.chemical_compound Monolayer PEG ratio lcsh:Science 030304 developmental biology 0303 health sciences Multidisciplinary Nanoscale materials Structural properties lcsh:R technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences X-ray reflectivity Chemical engineering chemistry Grazing-incidence small-angle scattering Nanorod lcsh:Q Self-assembly 0210 nano-technology Ethylene glycol |
| Zdroj: | Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) Scientific Reports |
| DOI: | 10.26434/chemrxiv.9788459 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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