Synthesis of size-controlled Bi particles by electrochemical deposition

Small sized bismuth particles are prepared by an electrochemical method using a triple voltage pulse technique. The bath composition and electrochemical parameters are optimized to yield monodisperse particles. The particles have been characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, UV-visible spectroscopy and X-ray diffraction technique. The particles, as deposited, are highly crystalline in nature and the particle size and shape get tuned depending on the conditions of deposition

Hydrothermal synthesis of amorphous MoS₂nanofiber bundles via acidification of ammonium heptamolybdate tetrahydrate

<p>Abstract</p><p>MoS₂nanofiber bundles have been prepared by hydrothermal method using ammonium molybdate with sulfur source in acidic medium and maintained at 180 &#176;C for several hours. The obtained black crystalline products are characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectrometer (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The PXRD pattern of the sample can be readily indexed as hexagonal 2H-MoS₂. FTIR spectrum of the MoS₂shows the band at 480 cm^&#8722;1corresponds to the &#947;_as(Mo-S). SEM/TEM images of the samples exhibit that the MoS₂nanofiber exist in bundles of 120&#8211;300 nm in diameter and 20&#8211;25 &#956;m in length. The effects of temperature, duration and other experimental parameters on the morphology of the products are investigated.</p