Weiss -- Nanoparticle Catalyst, Original (IMAGE) Northwestern University Caption Molecules adsorb on the surface of semiconductor nanoparticles in very specific geometries. The nanoparticles use energy from incident light to activate the molecules and fuse them together to form larger molecules in configurations useful for biological applications. Credit Credit: Yishu Jiang, Northwestern University Usage Restrictions Credit must be given 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.