Optical properties of the gold nanorods tuned by lead sulfide

In this paper, the optical properties of gold nanorods (GNRs) tuned by lead sulfide (PbS) were studied. GNRs used in this work were synthesized by seed-mediated methods. Using electrostatic self-assembly methods, GNRs were modified by repetition of adsorbing oppositely charged polyelectrolyte. Then GNR-PbS nanostructure was fabricated by alternatively adsorbing Pb(2+) and S(2-) ions on the surface of polyelectrolyte-modified-GNRs. The formation of PbS nanocrystals on GNRs can effectively regulate their optical properties, including longitudinal surface plasmon resonance (LSPR) and fluorescence.