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

• Main Authors: Stępinska Izabela, Kozłowski Mirosław, Radomska Joanna, Wronka Halina, Czerwosz Elżbieta, Sobczak Kamil
• Format: Article
• Language: English
• Published: Sciendo 2015-03-01
• Series: Materials Science-Poland
• Subjects: carbon nanotubes film; field emission; SEM; TEM
• Online Access: http://www.degruyter.com/view/j/msp.2015.33.issue-1/msp-2015-0023/msp-2015-0023.xml?format=INT

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).