Room Temperature Ferromagnetism in ZnO/SnO2 Nanotubes by Electrospinning
| Autor: | JC Fu, WY Zhang, JG Zhao, M Yang, ZL Liu, Erqing Xie, XY An |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Condensed matter physics Spintronics Coercivity Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter::Materials Science symbols.namesake Ferromagnetism Transmission electron microscopy symbols General Materials Science Crystallite High-resolution transmission electron microscopy Raman spectroscopy Wurtzite crystal structure |
| Zdroj: | Science of Advanced Materials. 6:985-989 |
| ISSN: | 1947-2943 1947-2935 |
| DOI: | 10.1166/sam.2014.1848 |
| Popis: | ZnO/SnO2 nanotubes are prepared by electrospinning method with postannealing in air at 500 degrees C. Field emission scanning electron microscopy (FE-SEM) reveals the formation of porous ZnO/SnO2 nanotubes. The X-ray diffraction (XRD) and Raman spectrum results show that the ZnO/SnO2 nanotubes have mixed of wurtzite (ZnO) and rutile (SnO2) structure. High-resolution transmission electron microscopy (HRTEM) results also assist the products polycrystalline nature with an average outer diameter of similar to 300 nm, a wall thickness of similar to 20 nm. The magnetic properties of ZnO/SnO2 nanotubes are studied using a superconductor quantum interference device (SQUID) magnetometer, and revealing the room-temperature ferromagnetism. The ferromagnetic origin has been ascribed to intrinsic defects. The coercivity and saturation magnetization of ZnO/SnO2 nanotubes at 5 K are estimated to be 191 Oe, 0.148 emu/g and higher than at 300 K. Such a ferromagnet without the presence of any transition metal could be a very good option for a class of spintronics. |
| Databáze: | OpenAIRE |
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