研究目的
Investigating the field electron emission characteristics of graphene-coated Mo tip array for fabricating highly efficient nanostructured field emitters.
研究成果
The innovative design of a hybrid graphene-coated Mo tip array for efficient field emission was successfully demonstrated. Both simulation and testing results showed that this methodology leads to a lowering of the turn-on field and enhanced maximum emission currents. The maximum emission current of the graphene-functionalized Mo tip array was 22 times larger than the pristine Mo tip array. This work paves the way for the design and applications of future electron emission 2D heterostructure nano devices.
研究不足
The study focuses on the fabrication and initial testing of graphene-coated Mo tip arrays. Long-term stability and scalability for industrial applications were not extensively explored. The effect of environmental factors on device performance was also not considered.
1：Experimental Design and Method Selection:
The study involved designing, fabricating, and evaluating a monolayer graphene-coated well-aligned Mo tip array for efficient electron field emission. The methodology included optimizing device parameters to enhance emission efficiency and reduce turn-on fields.
2：Sample Selection and Data Sources:
High purity (
3：95%) Mo wafer was used to fabricate the tip array. Graphene was transferred onto the Mo tips using standard PMMA transfer techniques. List of Experimental Equipment and Materials:
Equipment included a commercial ICP etcher (Sentech PTSA 500) for etching, and a custom-built, automated field emission system for measurements. Materials included a double-side-polished Mo wafer, Al film for etch mask, and PMMA/graphene films.
4：Experimental Procedures and Operational Workflow:
The process involved patterning the Mo tip array, etching, transferring graphene onto the Mo tips, and removing PMMA by heating. Field emission characteristics were measured at a base pressure of <10?7 mbar.
5：Data Analysis Methods:
Emission characteristics were measured from 0–5 kV, at 50 V increments, with spectra consisting of both up and down sweeps. The emission current was averaged at each bias.
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