Synthesis and Thermal Behavior of Metallic Cobalt Micro and Nanostructures

作     者：Marlene González Montiel P.Santiago-Jacinto J.A.I.Díaz Góngora E.Reguera Geonel Rodríguez-Gattorno 

作者机构：Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Instituto de Física Circuito de la Investigación Científica Ciudad Universitaria Departamento de Física AplicadaCINVESTAV-IPN 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2011年第3卷第1期

页      面：12-19页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：partially supported by the Consejo Nacional de Ciencia y Tecnología(CONACYT México)under Grant SEP-CONACyT 2009No.129048 

主　　题：Metallic Cobalt Cobalt nanoparticles Magnetic nanoparticles Hollow magnetic microparticles 

摘      要：In this contribution, a comparative study of metallic cobalt micro and nanoparticles obtained in solution by four different chemical routes is reported. Classic routes such as borohydride reduction in aqueous media and the so-called polyol methodology were used to obtain the cobalt nanostructures to be studied. Using CTAB as surfactant, cobalt hollow nanostructures were obtained. The use of strong reducing agents, like sodium borohydride, favors the formation of quasi-monodispersed nanoparticles of about 2 nm size but accompanied with impurities; for hydrazine(a mild reducer), nanoparticles of larger size are obtained which organize in spherical microagglomerates. Valuable information on the particles thermal stability and on nature of the species anchored at their surface was obtained from thermogravimetric curves. The samples to be studied were characterized from UV-vis, IR, X-ray diffraction, and electron microscopy images(scanning and transmission).