Electrochemically Deposited Nanoarchitectured Grating Nanoporous Metal Film using Block Copolymer Micelle for Ultra-sensitive SERS Platform
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Surface-enhanced Raman spectroscopy (SERS) is an effective technique for molecular detection using plasmonic metals, but challenges like high fabrication costs, poor reproducibility, and limited scalability hinder its practical use. To address these issues, we introduce a new nanoarchitecture technique that creates "hot spots" by adjusting gaps in grating nanoporous gold films. By controlling deposition voltage and time, we can precisely manipulate these gaps. The nanoporous structures enhance light trapping through multiple reflections within the pores, providing a large specific surface area that enriches target molecules and increases "hot spot" density. Additionally, multiple electric field couplings in these structures further amplify the local electromagnetic field, boosting the localized surface plasmon resonance effect. This study underscores the importance of nanogap formation and advanced nanoarchitecture technology in developing reliable, high-performance SERS sensors.