Microwave assisted synthesis of ZnS quantum dots using ionic liquids
2012
Shahid, Robina | Gorlov, Mikhail | El-Sayed, Ramy | Toprak, Muhammet S. | Sugunan, Abhilash | Kloo, Lars | Muhammed, Mamoun
In this work we report results from microwave (MW) assisted synthesis of highly crystalline ZnS quantum dots (QDs) using ionic liquid (ILs) as MW absorbing medium. Two types of ionic liquids, imidazolium and phosphonium based, were used. The QDs are less than 5nm in size and of wurtzite ZnS type, as characterized by high-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) pattern. The optical properties were investigated by UV–vis absorption and show a blue shift in absorption as compared to bulk wurtzite ZnS due to quantum confinement effects. The photoluminescence (PL) spectra of the QDs show different trap state emissions.
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