Browsing by Author "Pradeep Kumar Kashyap"

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High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures
(American Institute of Physics Inc., 2018) Bipin Kumar Gupta; Garima Kedawat; Amit Kumar Gangwar; Kanika Nagpal; Pradeep Kumar Kashyap; Shubhda Srivastava; Satbir Singh; Pawan Kumar; Sachin R. Suryawanshi; Deok Min Seo; Prashant Tripathi; Mahendra A. More; O.N. Srivastava; Myung Gwan Hahm; Dattatray J. Late
The vertical aligned carbon nanotubes (CNTs)-based pillar architectures were created on laminated silicon oxide/silicon (SiO2/Si) wafer substrate at 775 °C by using water-assisted chemical vapor deposition under low pressure process condition. The lamination was carried out by aluminum (Al, 10.0 nm thickness) as a barrier layer and iron (Fe, 1.5 nm thickness) as a catalyst precursor layer sequentially on a silicon wafer substrate. Scanning electron microscope (SEM) images show that synthesized CNTs are vertically aligned and uniformly distributed with a high density. The CNTs have approximately 2-30 walls with an inner diameter of 3-8 nm. Raman spectrum analysis shows G-band at 1580 cm-1 and D-band at 1340 cm-1. The G-band is higher than D-band, which indicates that CNTs are highly graphitized. The field emission analysis of the CNTs revealed high field emission current density (4mA/cm2 at 1.2V/μm), low turn-on field (0.6 V/μm) and field enhancement factor (6917) with better stability and longer lifetime. Emitter morphology resulting in improved promising field emission performances, which is a crucial factor for the fabrication of pillared shaped vertical aligned CNTs bundles as practical electron sources. © 2018 Author(s).