Synthesis and Manipulation of High Aspect Ratio Gold Nanorods Grown Directly on Surfaces

Abstract

Here we describe the synthesis of Au nanorods directly on glass surfaces using seed-mediated deposition of Au from AuCl4- onto surface-attached 3-5 nm diameter Au nanoparticles (AuNPs) in the presence of cetyltrimethylammonium bromide (CTAB). The average length (200 nm to 1.2 microm) and aspect ratio (6-22) of the nanorods increases with increasing AuCl4- concentration. Short, low aspect ratio Au nanorods are manipulated with an atomic force microscopy (AFM) tip, while longer, high aspect ratio nanorods are bent and broken with the AFM tip.

Preparation and Characterization of Gold Nanorods

“…4 %) , was attributed to a change in the probability of the growing seed to develop twinning defects. Subsequently, Wei et al adapted the method to grow nanorods directly on glass surfaces (Wei et al, 2004). They studied the influence of the linker used to attach the seed particles and the gold salt concentration in the growth solution on the formed gold nanostructures.…”

Spectrally-selective gold nanorod coatings for window glass

“…To achieve the former outcome gold seeds have been attached to a surface functionalized with aminopropyltrimethoxysilane (APTMS) before it was introduced into a rod growth solution [16][17][18]. With this strategy, neither aggregation of the seed particles nor Ostwald ripening can occur due to the very limited of diffusion of Au in such geometries.…”

The localized surface plasmon resonance (LSPR) response of gold and gold/silver metal nanostructures to protein binding and global refractive index changes.

“…We synthesized Au nanostructures directly on glass and Si/SiO x surfaces using a similar seed-mediated growth procedure described by our group previously, 160,[162][163][164]168 which is based on the solution seedmediated synthesis of Au nanorods described by Murphy and co-workers. 158 In our procedure, we deposited 4 nm average diameter Au "seed" nanoparticles onto thiol- .. hexagonal, or triangular structures are Au nanoplates as indicated in the images.…”