研究目的
To compare experimental and theoretical methods for determining the emission area of multi-tip field cathodes, specifically focusing on the relationship between microscopic parameters of individual emission sites and macroscopic characteristics of the sample.
研究成果
Various methods for estimating the emission area parameter were considered, with computer simulation allowing estimation of the possible emission area of one SWCNT. The comparative analysis showed that the effective emission area obtained from IVC treatment is overestimated compared to calculated values.
研究不足
The study acknowledges difficulties in clearly separating factors determining the emission current due to the structure of the FN formula and its modifications. The effective emission area obtained from IVC treatment is overestimated compared to calculated values.
1：Experimental Design and Method Selection:
The study compares four methods for estimating the emission area: processing experimental IVC using Forbes and Elinson-Shrednik approximations, determining emission area from FEP images, calculating emission area from a simulated array of tips, and calculating the effective and formal area of a single tip using COMSOL software.
2：Sample Selection and Data Sources:
A nanocomposite emitter based on single walled carbon nanotubes (SWCNT) / polystyrene was used as the cathode. The anode was a glass screen with ITO coating and a phosphor layer.
3：List of Experimental Equipment and Materials:
Field emission projector, SWCNT/PS emitter, glass screen with ITO coating, phosphor layer.
4：Experimental Procedures and Operational Workflow:
Emission properties were measured using a field emission projector with an interelectrode distance of 350 μm and residual pressure of ~1·10-6 torr.
5：Data Analysis Methods:
The IVC was processed using the FN-type equation, and emission area values were compared across different methods.
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