研究目的
To develop a surface-enhanced Raman spectroscopy sensing template consisting of gold-covered nanopillars for the detection of analytes in ultralow concentrations.
研究成果
The study successfully developed vertically coupled plasmonic arrays for SERS sensors with enhancement factors up to 1 × 107 and a standard deviation of the Raman intensity of 8%. The research highlights the potential of block copolymer lithography in fabricating cost-effective and scalable SERS substrates.
研究不足
The study focuses on the fabrication and characterization of SERS substrates but does not explore the application in detecting specific analytes beyond 4-aminothiophenol.
1：Experimental Design and Method Selection:
The study involves the fabrication of nanopillars by incorporating an iron salt precursor into a self-assembled block copolymer thin film and subsequent reactive ion etching.
2：Sample Selection and Data Sources:
Silicon substrates were used for the fabrication of nanopillars.
3：List of Experimental Equipment and Materials:
A 1 wt % PS-b-PEO solution in toluene, iron (III) nitrate solution in anhydrous ethanol, OIPT Plasmalab System100 ICP180 etcher, Temescal FC-2000 electron beam evaporation system.
4：Experimental Procedures and Operational Workflow:
The process includes spin casting, solvent vapor annealing, swelling in ethanol, incorporation of iron salt, UV/ozone exposure, reactive ion etching, and gold deposition.
5：Data Analysis Methods:
Raman spectroscopy was used to measure the SERS enhancement, and FDTD simulations were performed to investigate the electromagnetic near-field enhancement.
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