期刊
SOLID STATE SCIENCES
卷 12, 期 8, 页码 1364-1367出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2010.05.010
关键词
ZnO nanoflowers; Room-temperature ferromagnetism; Magnetic property
资金
- Jilin Project of Research and development [20075007]
- Special Funds for Major State Basic Research Project of China [2009CB220104]
- Program for Changjiang Scholar and Innovative Research Team in University [IRT0625]
- Research Fund for the Doctoral Program of Higher Education of new teacher [20090061120020]
ZnO nanoflowers are synthesized by hydrothermal method. The morphology of ZnO is captured by SEM. TEM and HRTEM, which is composed of closely packed nanorods of about 100 nm in diameter and 1 mu m in length. The ZFC/FC curves show superparamagnetic features. The abnormal increase in magnetization curves below 14 K comes from the isolated vacancy clusters with no interaction. The magnetic hysteresis at 300 K displays saturation state and confirms room-temperature ferromagnetism. While the magnetic hysteresis at 5 K shows nonsaturation state due to the enhanced effects of vacancy clusters. The O 1s XPS results can be fitted to three Gaussian peaks. The existence of medium-binding energy located at 531.16 eV confirms the deficiency of O ions at the surface of ZnO nanoflowers. (C) 2010 Elsevier Masson SAS. All rights reserved.
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