| 초록 |
In this work, stable a sub-nanometer size PbS quantum dots have been successfully synthesized via a systematically designed experiment. A detailed analysis of critical mechanism and stability for such ultrasmall prenucleated clusters is done. The experiment were conducted by controlled concentration, temperature and injection of respective precursors, thus enabling us to control nucleation rate and separation of stable sub-nanometer PbS QDs with size 0.8 nm. By providing additional thermal energy to PbS QDs, we achieved the fully nucleated cubic crystalline structure of PbS with size of around 1.5 nm. The prenucleated QDs are investigated by sophisticated tools like X-ray photoelectron spectroscopy (XPS) and medium energy ion scattering (MEIS) spectroscopy which confirms the synthesis of PbS with Pb2+ rich surface Non-classical nucleation theory is employed to substantiate the growth mechanism of prenucleated PbS QDs. This poster is review of Materials (2019) 12, 1109 (1-10) paper. |
