The Sonochemical Preparation of Air-stable Cobalt Nanoparticles

Qiaoling Li, Hongzhen Duan, Yuri Koltypin, Aharon Gedanken

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Nanoparticles of the cobalt have been prepared by sonolysis of a Co(NO)(CO)3 in diphenylmethane solution under argon. The as-prepared product is an amorphous material having 10 nm diameter particles. Upon annealing in argon at 450 0C/5h, an air-stable cobalt nanocrystalline is formed with an increased particle size to ∼ 30 nm. The cobalt nanoparticles have been characterized by XRD, TEM, TGA, DSC, XPS, and magnetic susceptibility measurements. The nanocrystalline particles have a core-shell structure in which the cobalt core is surrounded by a carbon surface layer. These cobalt nanoparticles show an excellent magnetic performance and storage stability. The stability of the nanocrystalline particle has been discussed, based on the core-shell structure.

Original languageEnglish
Title of host publicationProceedings of the International Symposium on Test and Measurement
Number of pages6
StatePublished - 2003

Publication series

NameProceedings of the International Symposium on Test and Measurement


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