سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

Masoud Salavati-Niasari – Institute of Nano Science and Nano Technology, University of Kashan
Noshin Mir – Department of Chemistry, Faculty of Science, University of Kashan
Fatemeh Davar – Department of Chemistry, Faculty of Science, University of Kashan

چکیده:

In recent years, there has been an increasing interest in developing materials with low-dimensional nanostructure such as nanotubes and nanowhiskers due to their potential technological application in nanoscale devices [1].Cobalt oxides belong to the family of transition-metal oxides and the most stable phase, Co3O4, is an intrinsic p-type semiconductor (direct optical bandgaps at 1.48 and 2.19 eV) [2]. Co3O4 exhibits a normal spinel crystal structure with occupation of tetrahedral sites by Co2+ and octahedral sites by Co3+. Its magnetic moment arises due to Co2+ ions largely because of spins, with a small contribution from spin–orbit coupling. So far, there has been few literature reporting cobalt or cobalt oxide nanowhiskers. Xu et al. [3] synthesized Co nanowires composed of nanowhiskers in the pore-wall modified-alumina by adjusting the electrodeposition parameters. Recently Wang et al. synthesized one-dimensional arrays of Co3O4 nanoparticles by the thermal treatment of cobalt oxalate precursor at 420 °C [4]. Among various techniques developed for the synthesis of magnetic nanoparticles, thermal decomposition is one of the most common to produce stable monodisperse suspensions with the ability of self-assembly. Recently, our groups prepared Co and Co3O4 via thermal decomposition a new precursor, [Bis(salicylidene)cobalt(II)], [5]. The aim of the present work is to prepare Co3O4 nanowhiskers using thermal decomposition of inorganic precursor