Improved field emission stability with a high current density of decorated CNTs for electron emission devices

Low-pressure chemical vapour deposition (LPCVD) has been used to grow multi-walled carbon nanotubes (MWCNTs) on a silicon (Si) substrate. The Si substrate is coated with iron (Fe) nanoparticles at different times of deposition at a power of 100 W (W) by using Radio Frequency (RF) sputtering. In this...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2023, Vol.34 (3), p.163, Article 163
Main Authors: Sarvar, Mohd, Aalam, Shah Masheerul, Raza, Mohammad Moeen Hasan, Khan, Mohammad Shahid, Ali, Javid
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical vapor deposition
Chemistry and Materials Science
Current density
Electron emission
Emission analysis
Emitters
Field emission spectroscopy
Fourier transforms
Infrared analysis
Infrared spectroscopy
Iron
Low pressure
Materials Science
Multi wall carbon nanotubes
Nanoparticles
Optical and Electronic Materials
Radio frequency
Raman spectroscopy
Silicon substrates
Spectrum analysis
Sputtering
Stability
Thickness
Zinc oxide
Zinc oxides
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Summary:Low-pressure chemical vapour deposition (LPCVD) has been used to grow multi-walled carbon nanotubes (MWCNTs) on a silicon (Si) substrate. The Si substrate is coated with iron (Fe) nanoparticles at different times of deposition at a power of 100 W (W) by using Radio Frequency (RF) sputtering. In this paper, we have prepared MWCNTs with different thicknesses of Fe nanoparticles. To enhance the field emission properties, we coat the surface of MWCNTs with Zinc oxide (ZnO) nanoparticles for 5 min at 100 W power by using the RF sputtering technique. The growth of MWCNTs and the attaching of ZnO nanoparticles on MWCNTs were substantiated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, Raman spectroscopy, and Fourier transform infrared (FTIR) spectroscopy. The field emission studies of ZnO x –Fe x @MWCNTs (where x represents 5 min) nanostructures show that the current density increases remarkably. Compared to other field emitters such as MWCNTs and ZnO-attached MWCNTs, the ZnO attached MWCNTs had less iron thickness MWCNTs field emitters are better field emitters with lower turn-on voltage, higher current density, higher field enhancement factor, and better repeatability, and they also show good stability over a period of 15 h.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-09420-1