Tripathi, Prashant and Gupta, Bipin Kumar and Bhatnagar, Ashish and Patel, C. R. P. and Banker, Prashant K. and Late, Dattatray J. and More, Mahendra A. and Lalla, N. P. and Phase, D. M. and Choudhary, R. J. and Shaz, M. A. and Ajayan, P. M. and Srivastava, O. N. (2018) Highly efficient field emission properties of radially aligned carbon nanotubes. Journal of Materials Chemistry C, 6 (24). pp. 6584-6590. ISSN 2050-7526

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Here, we report extraordinary field emission properties from one pot synthesized aligned carbon nanotubes endowed with related Fe nanoparticles (NPs). The CNT configuration is in the form of a carbon hollow cylinder (CHC) with CNTs radially aligned towards the CHC axis. The structure generates electron field emission properties such as an ultralow turn on field (0.35 V m(-1) at 10 A cm(-2)), a low threshold field (0.41 V m(-1) at 100 A cm(-2)) and a high field emission current density (7.71 mA cm(-2) at 0.78 V m(-1)). It also exhibits multi-fold improvement in the field enhancement factor (1.34 x 10(4)) with highly stable current emission at 100 A measured for 14 h. No post synthesis treatment is required for enhanced field emission characteristics. The growth related Fe NPs assist in lowering the work function and hence enhancing the field emission properties. The possibility of assembling nano-structured field emitters into macroscale architectures suggests new prospects for next generation three dimensional electron sources.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Royal Society of Chemistry.
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 17 Dec 2019 08:25
Last Modified: 17 Dec 2019 08:25

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