【[Langmuir]】Macroscopic Assembly of Gold Nanorods into Superstructures with Controllable Orientations by Anisotropic Affinity Interaction
作者：Rong, Y.; Song, L.; Si, P.; Zhang, L.; Lu, X.; Zhang, J.; Nie, Z.; Huang, Y.*; Chen, T*
關鍵字：Macroscopic Assembly,Gold Nanorods,Controllable Orientations
論文來源：期刊
具體來源：Langmuir
發表時間：2017年
Two-dimensional or three-dimensional highly
ordered arrays of anisotropic nanoparticles provide attracting
properties that are highly desired by the industry. Traditional
assembly methods such as evaporation usually produces the
nanostructure arrays only up to the millimeter scale with poor
control of nanoparticle orientation, making them hardly
applicable for industrial needs. Here, we report a facile method
to assemble centimeter-scale gold nanorod (Au NR) arrays
with highly controlled nanoparticle orientation and high
reproducibility. We selectively functionalized the transverse
or longitudinal facets of Au NRs with polyethylene glycol
(PEG) molecules and utilized the interfacial polymeric affinity
between the PEG domains on Au NRs and the PEGylated
substrate to achieve the anisotropic self-assembly. The sidePEGylated
Au NRs formed closely packed horizontal arrays, whereas the end-PEGylated Au NRs formed vertically standing
arrays on the substrate, respectively. The obtained Au NR arrays with different orientations showed anisotropic surface-enhanced
Raman scattering (SERS) performance. We showed that the vertically ordered Au NR arrays exhibited 3 times higher SERS
signals than the horizontally ordered arrays.