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Issue 20, 2012
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Manipulating the anisotropy and field emission of lanthanum hexaboridenanorods

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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.

Graphical abstract: Manipulating the anisotropy and field emission of lanthanum hexaboride nanorods

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Publication details

The article was received on 05 Mar 2012, accepted on 17 Jun 2012 and first published on 20 Jun 2012


Article type: Paper
DOI: 10.1039/C2RA20399E
RSC Adv., 2012,2, 7875-7885

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    Manipulating the anisotropy and field emission of lanthanum hexaboride nanorods

    Menaka, R. Patra, S. Ghosh and A. Kumar Ganguli, RSC Adv., 2012, 2, 7875
    DOI: 10.1039/C2RA20399E

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