In terms of nanotechnology, the size of nano rods has different morphology. The nano rods are one-dimensional structures which offer a directed way for the electrical transport and these are mainly used in order to control the bandwidth which differs in the radius of a rod and by making use of a quantum size effect.
The dimensions of the nano rod usually range from 10-100 nm. These rods are mainly synthesized by using the semi-conducting metals and materials in the ration 5:3. The most common way of synthesizing the nano rods is by the direct chemical process.
A quantum dot has the capability to give a different form of the polymer. The solar cell can be intensified by using the effect called as quantum confinement that will affect the width and length of nano rods by assisting to thinner devices for best absorption of an incident light.
Various Formations of Nano Rods
Gold is considered as one of the excellent nano rod due to its potential in the biological sensing; it has the capability to absorb the refractive index at IR that elevates the accurate sensing. Along with the absorption, the rods can be high at a peak of IR by using laser emission. The gold nano rods are usually excited and they generate a remarkable amount of heat. This heat will enable thermal deconstruction of injured cells like a tumor or cancer cells.
If you purchase the nano rods which are made up of gold you can evidence its different optical properties because of a quantum dot effect. You can find these rods in a cylindrical shape and the size differs from 10-40nm in its width, however, it can able to intensify to 100s when it comes to length.
Biological applications of gold nanorods
Gold nano particles are used as a supplement for the aesthetic reason. These nano particles can be adjusted in order to scatter and absorb the light which is close to the infrared areas of an electromagnetic spectrum. This kind of property will result from assembling oscillations of electrons across the surface of a metal and these can be improved by modifying the environment, size or shape. The nano particles of gold have a rod like structure which is of specific interest due to its anisotropic shape.
The absorbable form of the gold nano rods involves 2 bands of absorption: -
Because of the absorption through the long axis
Another one is because of the absorption through the short axis.
If the length of a rod intensifies, it performs a red shift longitudinal band in cooperation with intensifying in extinction coefficient. Due to sensitivity to modify in the local atmosphere and optical control, the gold nano rods are used for biomedical imaging, Photothermal therapy, materials for sensing and drug delivery.
The biomedical applications of the nano rods involve cancer imaging by making use of improvised scattering property and the photothermal therapy by making use of the improvised property of nano-radiative photothermal property.
