Electron emission properties of Spindt-type platinum field emission cathodes

Abstract

Electron emission properties of Spindt-type platinum field emission cathodes were investigated. The current-voltage characteristics together with the current fluctuation during long term operation were evaluated in ultrahigh vacuum. The changes of the emission properties in hydrogen, oxygen or carbon monoxide gas ambient were also investigated. Significant improvement of the emission properties was found when the cathode was operated in carbon monoxide ambient under a certain condition. It was found that the effect of the improvement lasted at least 200 h, and resistance against the oxygen exposure was also improved. The changes of the electron emission properties during long term operation in ultrahigh vacuum and in gas ambient were analyzed with the Seppen-Katamuki chart, of which ordinate and abscissa are slope and intercept of Fowler-Nordheim plot. The electron emission properties were distributed along a straight line in the Seppen-Katamuki chart, and those of the cathode improved by carbon monoxide exposure were distributed along another line. The deviation of the electron emission property in ultrahigh vacuum was considered to be due to change in the geometry of the emitting surface. The major reason for the modification of electron emission properties in carbon monoxide ambient was considered to be deposition of carbon onto the emitting surface, resulting in reduction of the work function. From the deviation of the Fowler-Nordheim characteristics in the Seppen-Katamuki chart, we presented an empirical equation for field emission.

Cathode technologies for field emission displays

“…According to the present understanding, the upper right side and lower left side respectively indicate the lower and higher work functions. This understanding is supported by many experimental results, such as those from a metal Spindttype emitter [27], boron-doped diamond [28], and carbon nanotubes [29]. …”

A statistical evaluation of the field emission for copper oxide nanostructures

“…The analysis of the electron emission properties of the Cu 2 O and CuO samples was largely done in terms of SK charts, which generally allow a better evaluation of the work function than the original F-N plots [1,3]. Fig.…”

“…slope and intercept, of many samples of copper oxide nanostructured field emitters, and then to evaluate their field emission capability. www.elsevier.com/locate/apsusc Applied Surface Science 254 (2008) [1859][1860][1861][1862][1863][1864][1865][1866][1867][1868][1869] This analysis was done in terms of Seppen-Katamuki (SK) charts [1], which generally allow a better evaluation of the work function than the original F-N graphs. Our SK-charts showed the characteristics that have already been reported by many researchers [1][2][3]: i.e.…”

Исследование С Применением SK-анализа Вольт-Амперных Характеристик Нанокомпозитных Полевых Эмиттеров На Основе Графена

“…В 2004 г. Gotoh, Ishikawa и Tsuji рассмотрели влия-ние на эмиссию платинового микроострия выдержки в атмосфере кислорода, водорода и углекислого газа [10]. На картинах полевого эмиссионного проектора наблю-далось блуждание пятен, которое авторы объяснили адсорбцией и десорбцией отдельных атомов в разных областях острия.…”