Morphology controlled NH4V3O8 microcrystals by hydrothermal synthesis

Abstract

Single crystalline ammonium trivanadate NH4V3O8 with variable morphologies, including shuttles, flowers, belts, and plates, was synthesized by the hydrothermal treatment of NH4VO3 with acetic acid. The crystals optimally grow under gentle conditions of 140 °C for 48 h. The resulting NH4V3O8 microcrystals were characterized by means of X-ray diffraction, scanning electron microscopy, infrared and Raman spectroscopy, static magnetization studies, and thermal analysis. The key factors to control the size and morphology of the crystals are the pH value and the vanadium concentration. A tentative microscopic growth mechanism is proposed and it is demonstrated how shape and morphology of the resulting microcrystalline material can be tuned by appropriate synthesis parameters.

Crystal growth of Bi2Te3 and noble cleaved (0001) surface properties

“…Thus, it can be concluded that the chemically cleaned Bi 2 Te 3 (0001) surface can be prepared by the crystal cleavage in the air environment. The specially exposed facets of crystals have been demonstrated to show enhanced properties in various applications [74][75][76][77][78][79][80][81][82]. The Bi 2 Se 3 -type crystals, including Bi 2 Te 3 , possess strongly specific properties of the (0001) surface and this factor should be accounted in the microcrystal growth and TI structure preparation.…”

Facile synthesis and lithium storage performance of (NH4)2V3O8 nanoflakes

“…. The stretching vibration in the range of 3700-2900 cm -1 probably results from the presence of a dense network of hydrogen bonds [18]. The chemical composition and valence state of the product were further studied by XPS.…”

Tuned hydrothermal synthesis of vanadium dioxide nanotubes

“…2b) and the resulting crystals are in the shape of 2D nanosheets (Fig. 1a) [18]. At a pH of 3.0, the vanadium precursor exists as octahedral [VO(OH) 3 (H 2 O) 2 ] 0 (Fig.…”