Multifunctional Nanoparticle (IMAGE) University of Washington Caption This is a quantum dot encapsulated in a gold shell. The total structure measures less than 20 nanometers across. Credit University of Washington Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.