51 / 2016-10-11 19:47:10

High Effective Sensor Substrate Composing of Silver Nano-cubes and Circular Grating Film

2917,4178,3353

A high effective hybrid plasmonic sensor substrate composed of silver nanocubes and silver circular grating is experimentally demonstrated by surface enhanced Raman scattering (SERS). The SERS performance of the composite substrate is sensitive to the period of grating. The control experiments show that 450 nm is the best for isolated silver circular grating sensor substrate. For the dual sensor substrate composed of silver nano-cubes+circular grating, 450 nm is the best for Raman peaks located at 1363 and 1510 cm-1 and 515 nm is the best for Raman peaks located at 612, 774, 1183 and 1311 cm-1 due to the plasmonic coupling effect between the silver nano-cubes and circular grating. The plasmonic interaction between the silver nano-cubes and the silver circular grating can generate more hot-spots, which can significantly enhance the Raman signals of probe molecules. The lowest concentration of the Rh6G molecules that can be detected is 10-13 M under 633 nm excitation based on this plasmonic composite SERS substrate.