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Study Connects the Quantum Dots

Posted on: Tuesday, 18 July 2006, 15:00 CDT

U.S. scientists say they've determined quantum dots can one day replace conventional organic dyes in biomedical applications.

Francisco Raymo, an Associate Professor of chemistry at the University of Miami, and colleagues used the photophysical properties of quantum dots to investigate molecular recognition events with luminescence measurements.

The scientists say their findings demonstrate that mechanisms based on photoinduced electron transfer can be exploited to transduce a recognition event into a significant change in the luminescence of a quantum dot.

Our method has a long-term impact on biomedical diagnostic applications which currently rely on the fluorescence of organic dyes, said Raymo. For example, our strategy can be designed to signal specific disease markers in biological samples, thus replacing conventional organic dyes in a diversity of imaging and sensing applications.

Quantum dots, one of the smallest nanoscience research tools, range from 2 to 10 nanometers in diameter.

The study appears in the current issue of the Proceedings of the National Academy of Sciences.

Source: United Press International

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