INOR 652 |
| Semiconductor quantum dots (QDs) have been widely used for multiple applications such as electronic materials, biological labeling and biosensors due to their unique optical properties. The most often used QD in biological application is CdSe over the past decade. However, the possible release of cadmium species of CdSe is the major concern because cadmium is regarded as intrinsic bio-toxic heavy metals. In this study, we have successfully fabricated a series of zinc chalcogenide to reduce the toxicity of QDs. ZnSe and ZnS were found to have wide band gaps and emitted wavelengths in the blue to ultra-violet range. Transition metals such as Cu and Mn were doped to change the optical properties. The color can be easily tuned by different doping processes. The quantum yield (QY) can be increased in the presence of dopants and surface modification. In addition, the thermal and pH stability of such zinc chalcogenide were examined and discussed in this study. |
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Nanoscience: Synthesis and Characterization
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |