研究目的
Investigating the actuation of plasmonic characteristics of thin gold films perforated with nanohole arrays coupled with gold nanoparticles using a responsive hydrogel cushion for sensing and optical spectroscopy applications.
研究成果
The developed hybrid plasmonic nanostructure allows for active control of plasmonic modes through a responsive hydrogel cushion, enabling applications in SPR and SERS detection. The structure's ability to switch between open and closed pore states offers unique opportunities for biosensing.
研究不足
The study is limited by the complexity of fabricating the nanostructure and the need for precise control over the hydrogel's swelling and collapsing behavior. The optical measurements were relative, not absolute, due to normalization with a reference flat gold film.
1：Experimental Design and Method Selection:
The study involved the preparation of a hybrid plasmonic nanostructure combining nanohole arrays (NHA) in a thin gold film with gold nanoparticles (NP) arrays, connected by a responsive hydrogel cushion. The plasmonic modes were investigated through optical transmission measurements and numerical simulations.
2：Sample Selection and Data Sources:
The nanostructure was fabricated using UV nanoimprint lithography (UV-NIL) and template-stripping techniques. Optical transmission spectra were measured using a halogen lamp and a spectrometer.
3：List of Experimental Equipment and Materials:
OrmoStamp resin, Ostemer 322 Crystal Clear, PDMS, perfluoro-silane, gold for thermal evaporation, pNIPAAm-based terpolymer, and various chemicals for surface modification and biofunctionalization.
4：Experimental Procedures and Operational Workflow:
The process included template fabrication, gold deposition, hydrogel cushion preparation, optical characterization, and application in SPR and SERS studies.
5：Data Analysis Methods:
Transmission spectra were analyzed to identify plasmonic modes. Numerical simulations using finite difference time domain (FDTD) methods complemented the experimental findings.
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