An easy way to controllably synthesize one-dimensional SmB6 topological insulator nanostructures and exploration of their field emission applications

doi:10.1088/1674-1056/26/11/118103

Abstract

A convenient fabrication technique for samarium hexaboride (SmB₆) nanostructures (nanowires and nanopencils) is developed, combining magnetron-sputtering and chemical vapor deposition. Both nanostructures are proven to be single crystals with cubic structure, and they both grow along the[001] direction. Formation of both nanostructures is attributed to the vapor-liquid-solid (VLS) mechanism, and the content of boron vapor is proposed to be the reason for their different morphologies at various evaporation distances. Field emission (FE) measurements show that the maximum current density of both the as-grown nanowires and nanopencils can be several hundred μA/cm², and their FN plots deviate only slightly from a straight line. Moreover, we prefer the generalized Schottky-Nordheim (SN) model to comprehend the difference in FE properties between the nanowires and nanopencils. The results reveal that the nonlinearity of FN plots is attributable to the effect of image potential on the FE process, which is almost independent of the morphology of the nanostructures. All the research results suggest that the SmB₆ nanostructures would have a more promising future in the FE area if their surface oxide layer was eliminated in advance.

Keywords: one-dimensional SmB₆ nanostructures chemical vapor deposition (CVD) field emission (FE) image potential

Received: 07 August 2017
Revised: 16 August 2017
Accepted manuscript online:

PACS:	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	81.15.Gh	(Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.))
	79.70.+q	(Field emission, ionization, evaporation, and desorption)
	73.20.-r	(Electron states at surfaces and interfaces)

Fund:

Project supported by the National Key Basic Research Program of China (Grant No. 2013CB933601), National Project for the Development of Key Scientific Apparatus of China (Grant No. 2013YQ12034506), the Fundamental Research Funds for the Central Universities of China, the Science and Technology Department of Guangdong Province, China, the Education Department of Guangdong Province, China, and the Natural Science Foundation of Guangdong Province, China (Grant No. 2016A030313313).

Corresponding Authors: Fei Liu
E-mail: liufei@mail.sysu.edu.cn

Cite this article:

Xun Yang(杨汛), Hai-Bo Gan(甘海波), Yan Tian(田颜), Ning-Sheng Xu(许宁生), Shao-Zhi Deng(邓少芝), Jun Chen(陈军), Huanjun Chen(陈焕君), Shi-Dong Liang(梁世东), Fei Liu(刘飞) An easy way to controllably synthesize one-dimensional SmB₆ topological insulator nanostructures and exploration of their field emission applications 2017 Chin. Phys. B 26 118103

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An easy way to controllably synthesize one-dimensional SmB6 topological insulator nanostructures and exploration of their field emission applications

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An easy way to controllably synthesize one-dimensional SmB₆ topological insulator nanostructures and exploration of their field emission applications