Low‐temperature synthesis of CrB nanoparticles and nanosheets by a solid‐state reaction

Abstract

Chromium boride (CrB) has been prepared by using the chromium trioxide (CrO3) and sodium borohydride (NaBH4) as starting materials in a stainless‐steel autoclave. The X‐ray powder diffraction pattern indicates that the as‐prepared product is orthorhombic phase CrB. Scanning electron microscopy shows that the product is composed of nanosheets and nanoparticles. In addition, the oxidation resistance of the as‐prepared CrB product has also been investigated.

Research progress on surface modifications for phosphors used in light-emitting diodes (LEDs)

“…The reason for the enhancement of water resistance is that the passivated samples have a rare Mn 4+ shell layer (KSF) on the surface, which is less soluble in water and prevents hydrolysis of Mn 4+ in the inner layer. 16,[30][31][32][33] Mn 4+ -doped fluoride phosphors as red-emitting component are used in commercial WLEDs. However, their application is seriously hindered by their easy hydrolysis.…”

Nanoporous germanium prepared by a mechanochemical reaction with enhanced lithium storage properties

“…Inspired by the low temperature synthesis of porous and nanostructured materials, 33–36 in this paper, nanoporous Ge (Z–Ge) was prepared through a simple mechanochemical-etching two-step reaction with Mg 2 Ge and ZnCl 2 . The prepared nanoporous Ge nanoparticles, as the anode for Li–Ge half cells, showed superior LIB performance, in terms of a high capacity of 1002.8 mA h g −1 at 2.0 C with a good long-term stability of 700 cycles, and a superior rate capability of 751.1 mA h g −1 even at 10 C. Significantly, the mechanochemical reaction was extended to produce other nanoporous Ge or Si materials such as A–Ge, Z–Si, and A–Si via the mechanochemical reaction between Mg 2 Ge and AlCl 3 , Mg 2 Si and ZnCl 2 , and Mg 2 Si and AlCl 3 .…”