| 초록 |
Melanin is a natural material that protects tissues from harmful sunlight. While exposed over light, melanin strongly absorbs the light and converts photons into phonons through nonradiative relaxation; this is known as photothermal effect. Here, we study thermal relaxation of melanin by optical characterization of dopamine-based melanin nanospheres. In addition, we decorate the melanin nanospheres with gold nanoparticles to enhance photothermal effect. During the deposition, gold cations are reduced, which are then bound to melanin surface. The number and size of the gold nanoparticles are controlled by adjusting the concentration of the gold cations. The deposition of gold nanoparticles leads to change of scattering colors and increase of maximum heating temperatures, which enables the visualization of melanin nanospheres and therapeutic use as photothermal agents. |
