1 research outputs found
Hierarchical Self-Assembly of Cu<sub>7</sub>Te<sub>5</sub> Nanorods into Superstructures with Enhanced SERS Performance
This
paper reports a strategy to get self-assembly of Cu<sub>7</sub>Te<sub>5</sub> nanorods into hierarchical superstructures: the side-by-side
self-assembly of nanorods into microscale one-dimensional (1D) nanowires
(primary structure), the side-by-side alignments of the 1D nanowires
into two-dimensional (2D) nanowire bundles (secondary structure),
and the further rolling up of the 2D bundles into three-dimensional
(3D) microtubes (tertiary structure). It was found that the oleylamine
(OLA)/n-dodecanethiol (DDT) mixture as a binary capping agent was
key to produce Cu<sub>7</sub>Te<sub>5</sub> nanorods in the quantum
size regime with high monodispersity, and this was a prerequisite
for their hierarchical self-assembly based on elaborate control of
the solvent evaporation process. The obtained Cu<sub>7</sub>Te<sub>5</sub> microtube superstructures were used as SERS substrate and
showed much stronger SERS enhancement than the as-prepared Cu<sub>7</sub>Te<sub>5</sub> nanorods before assembly. This was probably
ascribed to the remarkably enhanced local electromagnetic field arising
from the plasmon coupling of Cu<sub>7</sub>Te<sub>5</sub> nanorods
in the well-assembled superstructures