Induced ferromagnetic and gas sensing properties in ZnO-nanostructures by altering defect concentration of oxygen and zinc vacancies
Induced ferromagnetic and gas sensing properties in ZnO-nanostructures by altering defect concentration of oxygen and zinc vacancies
复制标题
DOI：
10.1016/j.matlet.2014.10.073
复制
发表时间：
2015-01-15
影响因子：
3
通讯作者：
Ray, S. S.
中科院分区：
文献类型：
--
作者：
Motaung, D. E.;Makgwane, P. R.;Ray, S. S.
我们报道了合成反应时间对zno纳米结构的结构、光学、磁性和传感性能的影响。电子顺磁共振和光致发光分析表明，单离子氧空位（V-0(+)）和锌空位（V-Zn）是主要缺陷，它们的相对浓度随着颗粒尺寸的增大而减小，导致铁磁性（FM）下降。此外，随着纳米结构合成反应时间的增加，由于表面积的减少以及V-0（+）和V-Zn浓度的降低，传感性能下降。由此可见，合成反应时间明显控制着V-0（+）的相对占有；和V-Zn存在于zno纳米结构的表面，这对于增强FM和传感特性至关重要。(C) 2014 Elsevier B.V.版权所有
We report on the effect of the synthesis reaction-time on the structural, optical, magnetic and sensing properties of ZnO-nanostructures. Electron paramagnetic resonance and photoluminescence analyses reveal that singly ionized oxygen vacancies (V-0(+)) and zinc vacancies (V-Zn) are the main defects and that their relative concentration decreases with increasing particle sizes, resulting in decreased ferromagnetism (FM). Moreover, the sensing performance decreased with an increase in nanostructures synthesis reaction-time due to a decreased surface area, as well as V-0(+) and V-Zn concentrations. Thus, the synthesis reaction-time clearly controls the relative occupancy of the V-0(+); and V-Zn present on the surface of ZnO-nanostructures, which is enunciated to be critical for enhanced FM and sensing characteristics. (C) 2014 Elsevier B.V. All rights reserved.