Displacement synthesis of Cu shells surrounding Co nanoparticles

被引:46
作者
Guo, ZH [1 ]
Kumar, CSSR
Henry, LL
Doomes, EE
Hormes, J
Podlaha, EJ
机构
[1] Louisiana State Univ, Gordon A & Mary Cain Dept Chem Engn, Baton Rouge, LA 70803 USA
[2] Louisiana State Univ, Ctr Adv Microstruct & Devices, Baton Rouge, LA 70806 USA
[3] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[4] A&M Coll, Baton Rouge, LA 70813 USA
关键词
D O I
10.1149/1.1825384
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Copper shells were fabricated by a displacement method around Co nanoparticles (3.2 +/- 0.6 nm) at room temperature in a copper-citrate aqueous electrolyte. The nanoparticles were synthesized by a wet chemical approach using the surfactant sulfobetaine, dodecyldimethyl (3-sulfopropyl) ammonium hydroxide (98%) in tetrahydrofuran. X-ray absorption near-edge structure analysis confirmed that cobalt oxide was not present in the nanoparticles upon exposure to air, consistent with a shell formation. Additionally, the presence of the shell resulted in an increase of the blocking temperature of the core-shell nanoparticles, stabilizing the ferromagnetic behavior up to 235 K. (C) 2004 The Electrochemical Society.
引用
收藏
页码:D1 / D5
页数:5
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