Enhanced light absorption of TiO(2) in the near-ultraviolet band by Au nanoparticles.
We propose a scheme to enhance near-UV band absorption of a rutile TiO(2) nanoparticle by placing Au nanoparticles in its neighborhood. The discrete-dipole approximation method was employed to calculate the absorption spectrum of pure rutile TiO(2) and that of TiO(2) mixed with Au nanoparticles. The results indicate that pure rutile TiO(2) has its maximum absorption located in the deep-UV band. With the existence of Au nanoparticles, a significant light harvesting effect occurs, and this maximum shifts to the near-UV band, where usual excitation wavelength falls.
Laboratory of Optical Physics, National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Science, P.O. Box 603, Beijing 100190, China.
Shu-Ya
SY
Du
Zhi-Yuan
ZY
Li