Field emission property of vertically aligned nitrogen-doped multi-walled carbon nanotubes produced by chemical vapor deposition

Autor(en)

Pongpanot Rindhatayathon, Worawut Muangrat, Mati Horprathum, Suphakan Kijamnajsuk, Wolfgang Pfeiler, Chaisak Issro

Abstrakt

Vertically aligned nitrogen-doped multi-walled carbon nanotubes (N-MWNTs) were synthesized by the chemical vapor deposition (CVD) at 900 °C using imidazole mixed with ferrocene as carbon and nitrogen sources, and catalyst, respectively. The effects of ammonia (NH

₃) and hydrogen (H

₂) flow rates on the growth of N-MWNTs were investigated (hereafter referred to A-N-MWNTs and H-N-MWNTs, respectively). Transmission electron microscopy (TEM) revealed the bamboo-like structure of the N-MWNTs, in which the separation between individual bamboo compartments decreased with increasing nitrogen concentration in N-MWNTs. X-ray photoelectron spectroscopy (XPS) analysis results supported that the nitrogen concentrations in N-MWNTs is 0.55 at.%, whereas A-N-MWNTs and H-N-MWNTs with the flow rate at 10 standard cubic centimeters per minute (sccm) (10A-N-MWNTs and 10H-N-MWNTs, respectively) showed 1.14 and 4.06 at.%, respectively. We found that the optimal conditions for the highest nitrogen-doped multi-walled carbon nanotubes (MWNTs) was a flow rate of NH

₃ and H

₂ at 10 sccm. Results from field emission measurements indicated that the turn-on fields of N-MWNTs, 10A-N-MWNTs and 10H-N-MWNTs were 6.7, 4.3 and 3.1 V/μm, respectively, while the field enhancement factors (β) were 5230, 10,805 and 20,390, respectively. Furthermore, the current density of N-MNWTs increased with increasing the nitrogen atoms in MWNTs. The results support that field emission based on N-MWNTs is a good emitter with low turn-on field and large field enhancement factor. Nitrogen doping in MWNTs makes them attractive candidates as high-performance field emitters.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Burapha University, Shinshu University, National Electronics and Computer Technology Center (NECTEC), National Metal and Materials Technology Center (MTEC), Ministry of Science and Technology, Bangkok

Journal

Materials Today: Proceedings

Band

5

Seiten

14965-14969

Anzahl der Seiten

5

ISSN

2214-7853

DOI

https://doi.org/10.1016/j.matpr.2018.04.039

Publikationsdatum

2018

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Materials Science(all)

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/field-emission-property-of-vertically-aligned-nitrogendoped-multiwalled-carbon-nanotubes-produced-by-chemical-vapor-deposition(94fea7b5-c4bd-4ba1-b3e6-7d752998c44b).html