Room-Temperature Ferromagnetism of Flowerlike CuO Nanostructures

被引:167
作者
Gao, Daqiang [1 ]
Yang, Guijin [1 ]
Li, Jinyun [1 ]
Zhang, Jing [1 ]
Zhang, Jinlin [1 ]
Xue, Desheng [1 ]
机构
[1] Lanzhou Univ, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Peoples R China
关键词
FIELD-EMISSION; FILMS; NANOPARTICLES; MAGNETISM; OXIDE; ZNO; NANOCRYSTALS;
D O I
10.1021/jp106015t
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Flowerlike CuO nanostructures were prepared by the coprecipitation method with postannealing in air at different temperatures. The results of X-ray diffraction and Raman and X-ray photoelectron spectroscopies show that the samples annealed at 400, 600, and 800 degrees C have a typical monoclinic structure and are absent of impurity phases. Magnetic measurements indicate that all of the CuO nanostructures show room-temperature ferromagnetism, whereas CuO bulk presents paramagnetism. The saturation magnetization of the samples was found to increase with increasing annealing temperature. The fitting results of the O Is XPS spectra for the three samples indicate that oxygen vacancies exist in the samples and that the variation of the oxygen vacancy concentration is in complete agreement with the variation of the saturation magnetization. When the samples were annealed in oxygen atmosphere, the ferromagnetism of the samples decreased enormously. These results confirm that the observed room-temperature ferromagnetism in flowerlike CuO nanostructures might originate from oxygen vacancies.
引用
收藏
页码:18347 / 18351
页数:5
相关论文
共 33 条
[1]   Strong room-temperature ferromagnetism in Co2+-doped TiO2 made from colloidal nanocrystals [J].
Bryan, JD ;
Heald, SM ;
Chambers, SA ;
Gamelin, DR .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (37) :11640-11647
[2]   A study on the photoelectrochemical properties of copper oxide thin films [J].
Chaudhary, YS ;
Agrawal, A ;
Shrivastav, R ;
Satsangi, VR ;
Dass, S .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2004, 29 (02) :131-134
[3]   Temperature dependence of field emission from cupric oxide nanobelt films [J].
Chen, J ;
Deng, SZ ;
Xu, NS ;
Zhang, WX ;
Wen, XG ;
Yang, SH .
APPLIED PHYSICS LETTERS, 2003, 83 (04) :746-748
[4]   X-ray photoelectron spectroscopy and auger electron spectroscopy studies of Al-doped ZnO films [J].
Chen, M ;
Wang, X ;
Yu, YH ;
Pei, ZL ;
Bai, XD ;
Sun, C ;
Huang, RF ;
Wen, LS .
APPLIED SURFACE SCIENCE, 2000, 158 (1-2) :134-140
[5]   Response speed of SnO2-based H2S gas sensors with CuO nanoparticles [J].
Chowdhuri, A ;
Gupta, V ;
Sreenivas, K ;
Kumar, R ;
Mozumdar, S ;
Patanjali, PK .
APPLIED PHYSICS LETTERS, 2004, 84 (07) :1180-1182
[6]   Abnormal phase transition and magnetic properties in Cu, Fe co-doped In2O3 nanocrystals [J].
Chu, Dewei ;
Zeng, Yu-Ping ;
Jiang, Dongliang .
APPLIED PHYSICS LETTERS, 2008, 92 (18)
[7]   Permanent magnetism in thiol capped nanoparticles, gold and ZnO [J].
Crespo, P. ;
Garcia, M. A. ;
Fernandez-Pinel, E. ;
De la Venta, J. ;
Merino, J. M. ;
Quesada, A. ;
Hernando, A. ;
Fernandez, A. ;
Penades, S. .
ACTA PHYSICA POLONICA A, 2008, 113 (01) :515-520
[8]   Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].
Dietl, T ;
Ohno, H ;
Matsukura, F ;
Cibert, J ;
Ferrand, D .
SCIENCE, 2000, 287 (5455) :1019-1022
[9]   Room temperature ferromagnetism in CoO nanoparticles obtained from sonochemically synthesized precursors [J].
Dutta, Dimple P. ;
Sharma, Garima ;
Manna, P. K. ;
Tyagi, A. K. ;
Yusuf, S. M. .
NANOTECHNOLOGY, 2008, 19 (24)
[10]   Ferromagnetism in ZnO Nanoparticles Induced by Doping of a Nonmagnetic Element: Al [J].
Gao, Daqiang ;
Zhang, Jing ;
Yang, Guijin ;
Zhang, Jinlin ;
Shi, Zhenhua ;
Qi, Jing ;
Zhang, Zhaohui ;
Xue, Desheng .
JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (32) :13477-13481