Influence of duration time of CVD process on emissive properties of carbon nanotubes films

Stępinska, Izabela; Kozłowski, Mirosław; Radomska, Joanna; Wronka, Halina; Czerwosz, Elżbieta; Sobczak, Kamil

doi:10.1515/msp-2015-0023

Abstract

In this paper various types of films made of carbon nanotubes (CNTs) are presented. These films were prepared on different substrates (Al₂O₃, Si n-type) by the two-step method. The two-step method consists of physical vapor deposition step, followed by chemical vapor deposition step (PVD/CVD). Parameters of PVD process were the same for all initial films, while the duration times of the second step - the CVD process, were different (15, 30 min.). Prepared films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and field emission (FE) measurements. The I-E and F-N characteristics of electron emission were discussed in terms of various forms of CNT films. The value of threshold electric field ranged from few V/μm (for CNT dispersed rarely on the surface of the film deposited on Si) up to ~20 V/μm (for Al₂O₃ substrate).

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Influence of duration time of CVD process on emissive properties of carbon nanotubes films

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