Characterization of the ZnO-ZnS Interface in THIOL-Capped ZnO Nanoparticles Exhibiting Anomalous Magnetic Properties

被引:40
作者
Guglieri, C.
Chaboy, J. [1 ]
机构
[1] Univ Zaragoza, Consejo Super Invest Cient, E-50009 Zaragoza, Spain
关键词
X-RAY-ABSORPTION; CIRCULAR-DICHROISM; DOPED ZNO; K-EDGE; TEMPERATURE FERROMAGNETISM; ROOM-TEMPERATURE; ELECTRONIC-STATE; SEMICONDUCTORS; TRANSITION; OXIDES;
D O I
10.1021/jp1074303
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
This work reports an X-ray absorption near-edge structure spectroscopy (XANES) study at the Zn K-edge in ZnO nanoparticles (NPs) capped with different organic molecules. The analysis of the XANES spectrum of NPs capped with dodecanethiol suggests that several Zn atoms bond to the S atoms of the capping molecule. Indeed, the comparison of the experimental XANES spectra and theoretical computations points out the existence of a ZnO-ZnS interface in which both ZnS and ZnO shows a wurtzite structure. These results support that the exotic magnetism observed in these capped ZnO NPs resides at the hybridized p band formed among Zn and the S bonding atoms in this interface, while the rest of the ZnO NPs behaves as a standard ZnO semiconductor.
引用
收藏
页码:19629 / 19634
页数:6
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