Manipulating the anisotropy and field emission of lanthanum hexaboride nanorods

Menaka, . ; Patra, Rajkumar ; Ghosh, Santanu ; Kumar Ganguli, Ashok (2012) Manipulating the anisotropy and field emission of lanthanum hexaboride nanorods RSC Advances, 2 (20). pp. 7875-7885. ISSN 2046-2069

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2012...

Related URL: http://dx.doi.org/10.1039/C2RA20399E

Abstract

The present study describes the controlled synthesis of lanthanum hexaboride nanostructures with efficient field emission properties. The synthesis is mediated by a nanostructured lanthanum hydroxide precursor, which is controlled by varying the capping agent and pH using a hydrothermal route. The effect of charge on the capping agent (surfactant) strongly affects the shape and size of the precursor (neutral surfactants lead to the formation of nanorods while a cationic surfactant results in the formation of particles). This precursor mediated route leads to lanthanum hexaboride nanostructures at much lower temperatures (∼500 °C lower than the conventional solid state route) and allows for variation of morphology of nanostructured films. Vertically aligned nanorods (30 nm × 200–400 nm), nanoparticles (25 nm) and sub-micron particles (0.2–0.25 microns) could be precisely obtained. Field emission studies of these vertically aligned nanorods show a very high field enhancement factor (4191), which is required for an efficient field emitter.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:112092
Deposited On:28 Sep 2017 12:35
Last Modified:28 Sep 2017 12:35

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