Synthesis and Transformation of Zn-Doped PbS Quantum Dots

A micelle-assisted wet-chemistry route is developed to synthesize pure and Zn-doped lead sulfide (PbS) quantum dots (Us) and nanocrystals (NCs) under microwave irradiation. The formation mechanism includes three major steps, initialization of pi-bonded complex, transformation into a micelle structure, and the dissipation of nanoparticles (NPs). The micelle structure plays an important role in PbS NCs and QDs transformation and formation. X-ray absorption near-edge structure (XANES) analysis confirms the quantum confinement in PbS QDs. The Burstein-Moss effect is responsible for the blue-shift of the absorption induced by Zn doping. This research opens a new way to prepare NCs and QDs that enables high-resolution analysis in quantum refinement and electronic structures. The NCs and QDs produced here have strong potential in applications in optical and electronic communication.