Silver nano wires

Based on these considerations, a great deal of current research on SERS has focused on the controlled and reproducible fabrication of metallic nanostructures that produce hot spots in which the molecules are appropriately and predictably located for large Raman enhancement. Several strategies have been proposed for engineering such hot structures for chemical sensing applications in a reproducible and controllable manner. These include structures such as triangular nanoparticle array [30], silver nano wire bundles [31, 32], Ag nanoparticle-assembled silica... 

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