Single-crystalline La_xNd_1−xB₆ nanowires: synthesis, characterization and field emission performance

Abstract

We report the catalyst-free synthesis of uniform distributed single-crystalline La x Nd 1Àx B 6 nanowires by simply heating mixed La and Nd powders to the required temperature in an inlet flux of mixed gases (H 2 , Ar and BCl 3 ). FE-SEM, HRTEM, SAED, EDS, element mapping, XRD and Raman scattering resultsshow that the La x Nd 1Àx B 6 nanowires are structurally uniform and well-doped single crystals. Based on our experimental results, a dominant VLS-like mechanism with a self-catalytic growth mechanism was proposed and depicted conceptually. The nanowires display an excellent field emission performance with a low turn-on field value of B4.12 V mm À1 when evaluated as an electron emitter. Attempts were also made to understand the morphological influence of reaction time, reaction temperature and the proportion of the La and Nd powders.

Electron Emission Devices for Energy‐Efficient Systems

“…In the last couple of decades, large number of new materials and composites have been studied to reveal their field emission performance including different metals, semiconductors, metal oxides, sulfides, carbides, nitrides, ferrites, perovskite solids, hexaborides, and so on. Apart from these materials, low‐dimensional materials are getting significant attention recently.…”

The effect of the properties of LaxNd8‒xB6 (x = 1,2,6)

“…The lattice constant decreased when Nd was doped into LaB 6 . Li et al (2015) fabricated La x Nd 1-x B 6 nanowires using a catalyst-free chemical vapor deposition (CVD) technique. Doping NdB 6 with La led to an increase in the lattice parameter.…”

“…Li et al. (2015) fabricated La x Nd 1‒x B 6 nanowires using a catalyst-free chemical vapor deposition (CVD) technique.…”

Recent Developments on Rare-Earth Hexaboride Nanowires

“…With the rise of 1D nanomaterials, RB 6 experienced the first wave of a research boom from 2005 to 2015, and many RB 6 nanowires were prepared by chemical vapor deposition (CVD) [9][10][11][12][13][14][15][16][17][18][19][20]. These RB 6 nanowires achieved excellent field emission properties and mechanical properties [21][22][23][24][25][26][27][28][29]. From 2016, the second wave of research boom of RB 6 began as SmB 6 proved to be a topological insulator, and researchers began to explore the difference in topological properties between nanowires and bulk single crystals [8].…”