Microwave power, temperature, atmospheric and light dependence of intrinsic defects in ZnO nanoparticles: A study of electron paramagnetic resonance (EPR) spectroscopy
Microwave power, temperature, atmospheric and light dependence of intrinsic defects in ZnO nanoparticles: A study of electron paramagnetic resonance (EPR) spectroscopy
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DOI：
10.1016/j.jallcom.2014.03.157
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发表时间：
2014-08-25
影响因子：
6.2
通讯作者：
Erdem, Emre
中科院分区：
文献类型：
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作者：
Erdem, Emre
本文采用共沉淀法合成了纳米氧化锌。我们研究了0.24 μ m和50 nm的ZnO样品的反应性作为散装和纳米尺寸，分别。根据核-壳模型，我们将g近似于2.004和g近似于1.961处的电子顺磁共振（EPR）信号分别指定为表面缺陷和核缺陷。研究了在不同的条件下，如微波功率和温度的变化，不同的气氛和不同的曝光量的表面和核心的本征缺陷的依赖性。我们发现，在这种条件下，核心缺陷比表面缺陷表现出更好的可控性。自旋晶格（T-1）和自旋自旋（T-2）弛豫时间也计算从微波功率依赖性测量，并发现这两个弛豫时间位于纳秒制度，这是非常短的。而在N2气氛下进一步退火后，弛豫时间T-1可以延长。(C)2014爱思唯尔有限公司版权所有。
In this work ZnO nanoparticles were synthesized by coprecipitation method. We investigated the reactivity of 0.24 mu m and 50 nm ZnO sample as bulk and nano-sized, respectively. According to core-shell model we designated the electron paramagnetic resonance (EPR) signal at g similar to 2.004 and g similar to 1.961 as surface defects and core defects, respectively. Dependency of intrinsic defects on the surface and core were investigated under various conditions such as changing of microwave power and temperature, different atmosphere and different light exposures. We found that under such condition core defects revealed more controllable property than the surface defects. Spin-lattice (T-1) and spin-spin (T-2) relaxation time were also calculated from microwave power dependency measurements and it is found out that both relaxation time lays around nano-second regime which is extremely short. However relaxation time T-1 can be longer under N-2 atmosphere after further annealing. (C) 2014 Elsevier B.V. All rights reserved.