论文信息 - SERS-active substrates based on metallic nanocracks on PDMS

SERS-active substrates based on metallic nanocracks on PDMS

We present a novel type of surface enhanced Raman scattering (SERS)-active substrates based on nanoscale metallic cracks formed on the surface of polydimethylsiloxane (PDMS). Compared with Raman spectral signals of Rhodamine B (RB) solutions on flat metal/PDMS surfaces without the nanocracks, the nanocrack regions on this SERS-active substrates have an enhancement factor on the order of 4×106. Moreover, with photolithography and “lift-off” techniques, metals might be patterned on the PDMS layer; and by bending the PDMS layer along certain directions, SERS-active substrates based on patterned metallic nanocracks are achievable. Such SERS-active substrates may be integrated into micro-fluidic systems for further wide range of applications.

[1] C. Qian,et al. A highly-ordered three-dimensional petal-like arrayed structure for highly surface-enhanced Raman scattering , 2010, 2010 IEEE 23rd International Conference on Micro Electro Mechanical Systems (MEMS).

[2] A. Kudelski. Raman studies of rhodamine 6G and crystal violet sub-monolayers on electrochemically roughened silver substrates: Do dye molecules adsorb preferentially on highly SERS-active sites? , 2005 .

[3] Luke P. Lee,et al. Nanowell surface enhanced Raman scattering arrays fabricated by soft-lithography for label-free biomolecular detections in integrated microfluidics , 2005 .

[4] Joel I. Gersten,et al. The effect of surface roughness on surface enhanced Raman scattering , 1980 .

[5] R. W. Christy,et al. Optical Constants of the Noble Metals , 1972 .

[6] M. Fleischmann,et al. Raman spectra of pyridine adsorbed at a silver electrode , 1974 .

[7] A. OTrO,et al. Surface-Enhanced Raman Scattering of Adsorbates , 2006 .

[8] De‐Yin Wu,et al. Surface-Enhanced Raman Scattering: From Noble to Transition Metals and from Rough Surfaces to Ordered Nanostructures , 2002 .