Silver metal has been used as an antibacterial agent, and titanium in drug delivery because of its stability, but gold metal has special optical properties, such as back scattering and the ability to bind strongly to thiol groups in human tissues. Gold metal was used because of its higher stability and can be functionalized with drugs for targeted drug therapy.1 Spherical gold nanoparticles and gold nanorods have been used in biomedicine. However, nanorods have gained importance due to its high light backscattering in the near infrared area, which give more insights in the field of optical imaging. The gold nanorods used in imaging had an advantage over enhanced imaging techniques because others convert soundwaves to image or use magnetic resonance imaging which cannot penetrate deeper into the tissues, whereas light scattering allows further penetration to even deeper tissues.
Silver metal has been used as an antibacterial agent, and titanium in drug delivery because of its stability, but gold metal has special optical properties, such as back scattering and the ability to bind strongly to thiol groups in human tissues. Gold metal was used because of its higher stability and can be functionalized with drugs for targeted drug therapy.1 Spherical gold nanoparticles and gold nanorods have been used in biomedicine. However, nanorods have gained importance due to its high light backscattering in the near infrared area, which give more insights in the field of optical imaging. The gold nanorods used in imaging had an advantage over enhanced imaging techniques because others convert soundwaves to image or use magnetic resonance imaging which cannot penetrate deeper into the tissues, whereas light scattering allows further penetration to even deeper tissues.