TITLE:
Gold Nanorods: Near-Infrared Plasmonic Photothermal Conversion and Surface Coating
AUTHORS:
Bo Cong, Caixia Kan, Honggeng Wang, Jinsheng Liu, Haiying Xu, Shanlin Ke
KEYWORDS:
Gold Nanorods; Surface Plasmon Resonance; Photothermal Effect; Core-Shell
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.2 No.1,
January
15,
2014
ABSTRACT:
In this paper,
AuNRs colloids with SPRL located at ~810 nm and ~1100 nm were synthesized using an
improved seed method. Based on the NIR lasers available, photothermal
conversion of AuNRs were systematically studied compared with that of water.
Under low power irradiation, the highest temperature is obtained when the SPRL wavelength of AuNRs is equal to the laser wavelength, and temperature of
colloid increases from ~20°C to ~65°C. With increasing laser power (such as 6 W),
the AuNRs colloid boils within a few minutes, and nanorods undergo a shape deformation
from rod to spherical particle and even fusion, and the SPRL disappears.
For further investigation, the obtained AuNRs were coated with SiO2 shell to form a core-shell nanostructure (Au@SiO2). The surface
coating can be used not only in keeping the stability of AuNRs for further
treatment, but also in increasing plasmonic property and biocompatibility. This
work will be useful for designing plasmonic photothermal properties and further
applications in nanomedicine.