Tiny “tags” made of dye molecules stuffed into carbon nanotubes have been used to develop a high-resolution imaging technique based on Raman scattering. Created by researchers in Canada, the tags boost the weak Raman signal of molecules about one million times. The new approach could lead to improved medical diagnostics and treatments, and could even be used to fight counterfeiting.
Raman spectroscopy involves shining a beam of light onto a solid or a liquid to identify its molecular composition. While most of the photons will scatter from the sample with no change of energy, a small number of photons will exchange …read more