Investigation of the Effect of Structural Properties of a Vertically Standing CNT Cold Cathode on Electron Beam Brightness and Resolution of Secondary Electron Images
| Autor: | Da Woon Kim, Boklae Cho, Kyu Chang Park, Alfi Rodiansyah, Ha Rim Lee, Joonwon Lim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
electron beam
Materials science General Chemical Engineering 02 engineering and technology Electron 01 natural sciences Article Secondary electrons law.invention Condensed Matter::Materials Science law 0103 physical sciences General Materials Science carbon nanotube QD1-999 010302 applied physics business.industry field emission Resolution (electron density) 021001 nanoscience & nanotechnology Cathode Field electron emission Chemistry Cathode ray Optoelectronics Cold cathode Physics::Accelerator Physics Electron microscope 0210 nano-technology business electron microscope |
| Zdroj: | Nanomaterials, Vol 11, Iss 1918, p 1918 (2021) Nanomaterials Volume 11 Issue 8 |
| ISSN: | 2079-4991 |
| Popis: | Carbon nanotube (CNT)-based cold cathodes are promising sources of field emission electrons for advanced electron devices, particularly for ultra-high-resolution imaging systems, due to their high brightness and low energy spread. While the electron field emission properties of single-tip CNT cathodes have been intensively studied in the last few decades, a systematic study of the influencing factors on the electron beam properties of CNT cold cathodes and the resolution of the secondary electron images has been overlooked in this field. Here, we have systematically investigated the effect of the structural properties of a CNT cold cathode on the electron beam properties and resolution of secondary electron microscope (SEM) images. The aspect ratio (geometric factor) and the diameter of the tip of a vertically standing CNT cold cathode significantly affect the electron beam properties, including the beam size and brightness, and consequently determine the resolution of the secondary electron images obtained by SEM systems equipped with a CNT cold cathode module. Theoretical simulation elucidated the dependence of the structural features of CNT cold cathodes and electron beam properties on the contribution of edge-emitted electrons to the total field emission current. Investigating the correlations between the structural properties of CNT cold cathodes, the properties of the emitted electron beams, and the resolution of the secondary electron images captured by SEM equipped with CNT cold cathode modules is highly important and informative as a basic model. |
| Databáze: | OpenAIRE |
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