Wet Preparation of Organic Stabilizer Free Urchin Structured Nickel Fine Particles and Their In-Situ TEM Observation at High Temperature

Abstract

  Urchin structured nickel fine particles have been successfully obtained by the hydrazine reduction of NiCl₂•6H₂O in ethanol. Changing the time of the addition of hydrazine and sodium hydroxide can control the particle structures, especially the aspect ratio of the Ni nanoneedles. These particles were not stabilized by organic compounds. In-situ TEM observation at high temperature revealed the deformation of the obtained fine particles began at 350℃.