“The dielectric coating is a good idea, because it renders the particles inert,” says Renato Zenobi of the Swiss Federal Institute of Technology, Zurich, the inventor of a related method called tip-enhanced Raman spectroscopy (TERS). The dust improves the sensitivity of SHINERS relative to SERS and TERS. Compared with TERS, SHINERS has less spatial resolution but higher signal intensity from the greater number of nanoparticles on the sample, Zenobi says. Using SHINERS, Tian, Wang, and coworkers analyzed a wide range of samples. They measured hydrogen adsorption on single-crystal flat surfaces made of platinum and silicon.
by Celia Henry Arnaud |
March 22, 2010