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24 April 2010 Rational engineering of highly sensitive SERS substrate based on nanocone structures
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At last meeting, we reported a new type of surface-enhanced Raman Spectroscopy (SERS) substrates based on metal (Au or Ag) coated Si nanocones fabricated by a Bosch etching process. The substrate showed reliable SERS performance with an analytical enhancement factor greater than 6 × 107 for trans-1,2-bis(4-pyridyl)-ethylene (BPE) molecules. However, the process is limited to single crystalline silicon material, also silicon can absorb both incident and scattered light, making it difficult to investigate the SERS enhancement mechanism. To further improve the sensitivity of the SERS substrate, we have recently developed a process to duplicate the Si nanocones by a cross-linked polymer using 3-D nanoimprint lithography (NIL). The SERS substrate made by NIL demonstrated better enhancement factors for both 633 nm excitation and 785 nm excitation with analytical enhancement factors of over 1011 demonstrated. We will report the rational engineering of the nanocone based SERS substrate and the fundamental understanding of the enhancement mechanism.
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Wei Wu, Min Hu, Fung Suong Ou, R. Stanley Williams, and Zhiyong Li "Rational engineering of highly sensitive SERS substrate based on nanocone structures", Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 76730O (24 April 2010);

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