Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 4, Pages 1370-1374Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm14144a
Keywords
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Funding
- Research Grants Council of HKSAR [CityU5/CRF/08, CityU 101608]
- NSFC [30900338, 51072126]
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The availability of well-controlled and reproducible substrates is critically important for surface-enhanced Raman spectroscopy (SERS)-based applications, but it remains a challenge at present. Herein, we report a facile strategy to prepare a new kind of SERS-active substrate, i.e., a two dimensional (2D) macroporous Ag film composed of a silver nanosheet (AgNS)-coated inverse opal film. The prepared substrate features good SERS reproducibility with a high enhancement factor (6 x 10(7)), enabling the ultra-sensitive detection of 10 fM rhodamine 6G (R6G). Moreover, the resultant substrate can be applied in the label-free detection of DNA with a sensitivity limit as low as 5 nM. Consequently, as a high-performance SERS-active substrate, the 2D AgNS-coated inverse opal film is promising for a myriad of chemical and biochemical sensing applications.
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