研究目的
To study the use of masks to directly generate large area, highly ordered and periodical nanostructures for surface-enhanced Raman scattering (SERS) applications.
研究成果
The research successfully demonstrated a simple and efficient method to fabricate large area, highly ordered periodic Au nanostructures on graphene for enhanced SERS performance. The combination of graphene's chemical enhancement and the electromagnetic enhancement from metallic nanostructures significantly improved the Raman signals. The study provides insights into the design of high-performance SERS substrates for sensing and spectroscopy applications.
研究不足
The study is limited by the fabrication process's dependency on the quality of the graphene transfer and the precision of the mask alignment, which can affect the uniformity and performance of the nanostructures.
1：Experimental Design and Method Selection:
The study involves the fabrication of periodic Au nano-discs (NDs) arrays on top of graphene using a holey Si3N4 mask fixed on top of graphene, with Au metal deposited through the holes in the mask by thermal evaporation under vacuum. The method also explores Au nanoholes (NHs) structure using holey Si3N4 as a template.
2：Sample Selection and Data Sources:
Graphene was synthesized by atmospheric pressure chemical vapor deposition (CVD) on copper foil and transferred to SiO2/Si substrate. Fluorescein molecules were used as probe molecules for SERS measurements.
3：List of Experimental Equipment and Materials:
Scanning electron microscope (SEM, JSM-6700F), atomic force microscope (AFM, NT-MAT), Bruker OPUS Raman system, holey Si3N4 masks, Kapton? tape, gold wire, fluorescein molecules powder.
4：Experimental Procedures and Operational Workflow:
The fabrication process includes transferring graphene to SiO2/Si substrate, fixing the Si3N4 mask on top, depositing Au through thermal evaporation, and characterizing the structures with SEM and AFM. SERS measurements were performed using a Raman system with laser excitation at 532 nm.
5：Data Analysis Methods:
The enhancement factors of SERS were calculated by comparing the Raman signals from different substrates. Electric field simulations were performed to understand the enhancement mechanisms.
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