Synthesis of monodisperse CoPt3 nanocrystals and their catalytic behavior for growth of boron nanowires

Abstract

Monodisperse CoPt 3 nanocrystals (NCs) have been synthesized in oleylamine solution by an organic solvothermal method. The NCs were ellipsoidal particles with a diameter around 6.6 nm and length around 10 nm with a good single crystal structure. Using CoPt 3 NCs as catalysts, large-area boron nanowires with diameters ranging from 30 to 50 nm were successfully prepared by chemical vapor deposition using a C/B/B 2 O 3 mixture as the precursor. Structural analysis indicated that these nanowires were single crystalline with a β-rhombohedral structure. Measurement of the field emission properties of boron nanowire films showed that the boron nanowires have good field emission characteristics.

Preparation of few-layer graphene-capped boron nanowires and their field emission properties

“…[27] Compared to GC-BNWs' FN plots, BNWs' FN plots exhibit a nonlinear behavior and can be divided into three regions, which obey the FN theory of semiconductors. [10,28] This phenomenon also proves that conductivity is improved when graphene covers the BNWs. The emission current stability is a parameter to evaluate the FE properties of cathode materials.…”

Growth of Large‐Scale Boron Nanowire Patterns with Identical Base‐Up Mode and In Situ Field Emission Studies of Individual Boron Nanowire

“…Although these two problems do exist for several years, the efficient ways to solve them have not been found until now. Most reports have been devoted to the separate investigation of synthesis methods or field emission properties rather than attacking these two issues in a complex manner, which provides a great challenge for the researchers.…”

Well-Aligned CoPt Hollow Nanochains Synthesized in Water at Room Temperature

“…In materials science, great interest has been attracted to bimetallic nanomaterials because this new type of materials exhibit novel properties distinct from those of pure element nanostructures or the corresponding bulk matters. − Enhancements in magnetic and/or catalytic properties benefitting from the synergistic effect upon alloying were observed in Pt-based bimetallic nanomaterials including FePt, CoPt, RhPt, and so on. − Particularly, CoPt nanomaterials show alluring and fertile behavior such as good electrical, catalytic, and magnetic properties together with high stability. − Moreover, the large crystalline anisotropy provides the possibility of assembling shape-symmetric units into their asymmetric counterparts, such as one-dimensional (1D) CoPt nanochains/wires . The shape anisotropy mainly due to a large aspect ratio allows CoPt 1D nanostructures to be well aligned, providing a direct and effective way to manipulate and assemble them along certain orientations by the external magnetic fields.…”