Relationship between the Magnetic Properties and the Formation of a ZnS/ZnO Interface in S-Capped ZnO Nanoparticles and ZnS鈥揨nO Thin Films
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- 作者：C. Guglieri ; A. Espinosa ; N. Carmona ; M. A. Laguna-Marco ; E. C茅spedes ; M. L. Ru铆z-Gonz谩lez ; J. Gonz谩lez-Calbet ; M. Garc铆a-Hern谩ndez ; M. A. Garc铆a ; J. Chaboy
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：June 13, 2013
- 年：2013
- 卷：117
- 期：23
- 页码：12199-12209
- 全文大小：716K
- 年卷期：v.117,no.23(June 13, 2013)
- ISSN：1932-7455
文摘
We have synthesized ZnO nanoparticles capped with butanethiol, octanethiol, and dodecanethiol. In all of the cases, the capped ZnO nanoparticles exhibit ferromagnetic-like behavior up to room temperature whose intrinsic origin has been demonstrated by using both X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) at the Zn K-edge. Using these tools, we have also determined that the occurrence of ferromagnetism does not critically depend on the details of the synthesis but on the formation of a pristine ZnS/ZnO interface. Within this interface, ferromagnetism is favored in those regions where the local order is closer to wurzite-like ZnO than to w-ZnS. The study of ZnS鈥揨nO films prepared by cosputtering clearly indicates that increasing the disorder of this interface weakens the onset of ferromagnetic behavior.