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Morphology tuning and electron emission properties of carbonaceous LaB6 system obtained using thermal plasma route

Abstract

In the present study we report the morphological tuning of carbonaceous nano-crystalline lanthanum hexaboride (LaB6) using arc plasma route. It was possible to obtain different morphologies namely; pebbles, rods and sheets, at nano-scale by means of plasma assisted vapour phase growth and by varying the plasma current. At elevated plasma currents, as a consequence of graphite electrodes being used in the arc geometry, the synthesized product was obtained in the form of carbonaceous LaB6 having high degree of crystallinity. Detailed morphological analysis using electron microscopy, has revealed that nano-rods and nano-sheets of carbonaceous LaB6 can be grown by elevating the plasma currents. The Field Emission (FE) current was found to be enhanced from 200 µA /cm2 to 660 µA /cm2 for the hierarchical structure of nano-sheets as compared to nano-pebbles at much reduced turn-on potential. Stable FE current was an important feature exhibited by all these nano–LaB6 structures.

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Publication details

The article was accepted on 31 May 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8CE00622A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Morphology tuning and electron emission properties of carbonaceous LaB6 system obtained using thermal plasma route

    V. L. Mathe, S. A. Kamble, K. Harpale, S. Ghorui, D. Bhattacharjee, S. V. Boraskar and M. A. More, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00622A

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