研究目的
Investigating the controllable fabrication of gold nanopatterns on pristine monolayer graphene using nanosphere lithography and their effects on graphene's surface structure and Raman spectroscopy.
研究成果
Uniform and periodic Au nanopatterns were successfully fabricated on monolayer graphene using nanosphere lithography. These nanostructures enhance Raman scattering of G and 2D bands by surface plasmon resonance and introduce compressive stress leading to a blue shift of 2D band. The metal-induced doping effect reduces the intensity ratio between 2D and G bands. These findings suggest potential applications in catalysts, biosensors, and optics.
研究不足
The study focuses on the fabrication and initial characterization of Au nanopatterns on graphene. The long-term stability and performance of these nanostructures in practical applications are not explored.
1：Experimental Design and Method Selection:
Nanosphere lithography was used to fabricate Au nanopatterns with certain size on monolayer graphene.
2：Sample Selection and Data Sources:
Graphene sample was peeled off from highly ordered pyrolytic graphite (HOPG). PS spheres (500 nm) were used as lift-off mask.
3：List of Experimental Equipment and Materials:
SEM (JEOL JSM-6700F), AFM (Dimension Edge, Bruker, Santa Barbara, CA), Raman spectroscopy (WITEC Alpha300R confocal system), electron beam evaporation (Edwards Auto 306).
4：6). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Graphene was transferred onto the 300 nm SiO2/Si substrate. A monolayer of highly ordered PS spheres was self-assembled on water surface and then lifted off onto the graphene. Au was deposited by electron beam evaporation.
5：Data Analysis Methods:
Raman spectroscopy was performed to confirm the graphene structure and its properties after coating of PS spheres or formation of Au nanoislands.
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