An in-Situ Chloride-Generated Route to Various One-Dimensional Nanostructures of Chromium-Based Compounds

Abstract

A convenient in-situ chloride-generated route has been developed to fabricate various novel one-dimensional nanostructures of Cr-based compounds including CrSi 2 , CrN and SiN x -coated CrSi 2 , CrN (with a trace of CrSi 2 ), and CrN-CrSi 2 intermediate composites for the first time. And the evolution of the products has been clearly illuminated on the basis of involved chemistry and the convincing characterization results. The diverse regulation of the products, the simplicity of the preparation procedure, and the wide potential applications of this route make this study both scientifically and technologically interesting.

Morphology-controlled growth of chromium silicide nanostructures and their field emission properties

“…Transition-metal silicides have attracted great scientific and technological interests due to their good conductivity, high melting point, excellent oxidation resistance as well as their potential applications in microelectronics, energy conversion and thermoelectric materials. [1][2][3][4][5][6][7][8][9][10][11][12] Additionally, owing to the good compatibility with silicon substrates, some metal silicides show intriguing potential in various silicon-based optoelectronics and spintronics. 13,14 With the development of nanotechnology, it has been reported that the nanostructures of transition-metal silicides exhibit better performance in comparison with their bulk.…”

“…13,14 With the development of nanotechnology, it has been reported that the nanostructures of transition-metal silicides exhibit better performance in comparison with their bulk. 4 Great efforts have been devoted to the studies on the synthesis, properties and applications of low-dimensional silicides, and recently, many low-dimensional nanostructures of metal silicides, such as Fe 5 Si 3 /FeSi nanowires, 5,6 NiSi/Ni 2 Si nanowires, 7,8 CrSi 2 nanowires, 2,9,10 CoSi nanowires, 4 MnSi nanowires, 14 Pt 2 Si nanowires, 11 V 5 Si 3 nanotubes, 12 etc., have been prepared and in depth studied.…”

“…Its nanostructures have exhibited a promising future in, e.g., thermoelectric device 2 and electrical transport. 9,15 To date, the obtained nanostructures of CrSi 2 are still restricted in nanowires 2,9,10,15 and their derivative hexagonal nanowebs 16 or nanocombs, 17 while other nanostructured morphologies of CrSi 2 have not been discovered yet. Recently, we developed an in situ chloride-generated route to synthesize CrSi 2 nanowires.…”

“…Recently, we developed an in situ chloride-generated route to synthesize CrSi 2 nanowires. 10,17 Compared with other reported synthetic methods, this simple route can avoid the utilization of iodine, 9 metal catalyst 18 and air/moisture-sensitive and poisonous precursors. 15,16 In order to recognize the influence of growth conditions on the morphologies of CrSi 2 products, herein we optimized the growth apparatus, by which the concentration of precursors could be conveniently regulated.…”

A general low-temperature CVD synthetic route to fabricate low-melting-point-metal compounds 1D nanostructures

“…2c and d, it is seen that the gray product obtained on Si substrate at 750 • C is flocky nanorods with the hexagonal-cross-section and the uniform diameter of about 100-300 nm and the typical length of several micrometers, and the diffraction peaks are indexed to wurtzite AlN with lattice parameters a = 3.14 Å and c = 4.97 Å. The hexagonal-cross-section is a typical feature from hexagonal phase compounds [26].…”