The gold nano structures are one in the nano physical types used more in
the biomedical applications for increasing sensitivity of the diagnostic and
the targeted therapy. These are the research directions that many labs in the
world and in Viet Nam are interested in developing. Gold nanospheres
show an extinction sccross-section (absorption and scattering) 4-5 orders
higher than conventional absorbing dyes. In particular, the plasmon
resonance of the gold or silver nanostructures can be tuned to specific
wavelengths across the visible and infrared range of the electromagnetic
spectrum, for applications ranging from the construction of photonic
crystals to biophotonics. Moreover, the superior properties of gold
nanostructures are stability structural, non-toxic, highly biocompatible, and
they are easily surface function to bind to biomolecules such as amino
acids, enzymes, DNA and drug molecules through the -SH group. With
these unique surface-chemistry properties, the applied studies of gold
nanostructures are more and more developed and promising great
achievements in biomedical applications. For example: (i) gold
nanoparticles are capable of carring drugs, delivering drugs and
photoluminescence in tissue; (ii) core / shell nanostructures with strong
light scattering from visible to near infrared (NIR) are applied to in vivo
imaging in the body (10 cm) to present cancer cells. At the same time, with
the ability to absorb light intensively in the near-infrared region, gold
nanoshells are used to destroy cancer cells by phototherapy without
compromising healthy cells also do not affect the genetic factors.
Based on the actual exigency and the ability to response those exigencies of
the gold nanostructures, as well as from the research situation in the world
and in Viet Nam, we chose and study the topic: “Synthesis and optical4
properties of gold nanostructures spherical, rod and core/shell SiO2/Au
shape for biomedical applications”
