Fabrication of PbS Quantum Dot Doped TiO2 Nanotubes

Abstract

PbS quantum dots (PbS QDs) were prepared on the inside and outside surfaces of TiO₂ nanotubes by using thiolactic acid as an organic linker. The sizes of PbS QDs were controlled by employing a dip coating process to anchor the PbS QDs onto the TiO₂ nanotubes. The PbS QDs with diameters of 2−10 nm were obtained by adjusting the concentration of thiolactic acid. TiO₂ nanotubes with PbS QDs located only inside the nanotubes were prepared by first coating the tubes with the double-chain cationic surfactant DDAB. The PbS QDs supported on TiO₂ nanotubes were characterized by TEM, as well as Raman, FT-IR, and UV−vis spectroscopy.