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Direct Assembly of Vertically Oriented, Gold Nanorod Arrays
Author(s) -
Zhang Heyou,
Liu Yawei,
Shahidan Muhammad Faris Shahin,
Kinnear Calum,
Maasoumi Fatemeh,
Cadusch Jasper,
Akinoglu Eser Metin,
James Timothy D.,
WidmerCooper Asaph,
Roberts Ann,
Mulvaney Paul
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202006753
Subject(s) - nanorod , materials science , plasmon , nanotechnology , dipole , optoelectronics , electric field , nanocrystal , nanophotonics , deposition (geology) , optics , paleontology , chemistry , physics , organic chemistry , quantum mechanics , sediment , biology
Although many nanoscale materials such as quantum dots and metallic nanocrystals exhibit size dependent optical properties, it has been difficult to incorporate them into optical or electronic devices because there are currently no methods for precise, large‐scale deposition of single nanocrystals. Of particular interest is the need to control the orientation of single nanocrystals since the optical properties are usually strongly anisotropic. Here a method based on electrophoretic deposition (EPD) is reported to precisely assemble vertically oriented, single gold nanorods. It is demonstrated that the orientation of gold nanorods during deposition is controlled by the electric dipole moment induced along the rod by the electric field. Dissipative particle dynamics simulations indicate that the magnitude of this dipole moment is dominated by the polarizability of the solution phase electric double layer around the nanorod. The resulting vertical gold nanorod arrays exhibit reflected colors due to selective excitation of the transverse surface plasmon mode. The EPD method allows assembly of arrays with a density of over one million, visually resolvable, vertical nanorods per square millimeter.