Synthesis and magnetic properties of Gd doped EuS nanocrystals with enhanced Curie temperatures.
Synthesis and magnetic properties of Gd doped EuS nanocrystals with enhanced Curie temperatures.
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DOI：
10.1021/ja104314c
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发表时间：
2010-11-17
影响因子：
15
通讯作者：
Jin, Song
中科院分区：
文献类型：
--
作者：
Selinsky, Rachel S.;Han, Jae Hyo;Perez, Elvin A. Morales;Guzei, Ilia A.;Jin, Song
铕硫化物（EuS）纳米晶体（NCs）掺杂钆（Gd）后其磁性得到增强。合成了新的铕硫化物和钆硫化物单源前驱体（SSPs），对其进行了表征，并用于在290°C下通过在油胺和三辛基膦中分解来合成Eu₁₋ₓGdₓS纳米晶体。利用X射线衍射、透射电子显微镜和扫描透射电子显微镜对掺杂的纳米晶体进行了表征，通过电子能量损失谱（EELS）图谱证实了钆掺杂剂的均匀分布。X射线吸收光谱（XAS）表明Eu₁₋ₓGdₓS纳米晶体中的掺杂离子主要是Gd³⁺。使用振动样品磁强计对具有多种钆掺杂比例（0≤x＜1）的纳米晶体进行了系统研究，并将观察到的磁性与通过电感耦合等离子体原子发射光谱（ICP - AES）定量的钆掺杂水平（x）相关联。在低钆浓度（x≤10%）的样品中观察到居里温度（T_C）升高，对于含5.3%钆的纳米晶体观察到的最大居里温度为29.4 K。总体而言，观察到的居里温度、外斯温度（θ）和磁滞行为与Eu₁₋ₓGdₓS纳米晶体中的掺杂水平直接相关，并且这些趋势在定性上与先前对块体和薄膜样品所报道的一致。
EuS nanocrystals (NCs) were doped with Gd resulting in an enhancement of their magnetic properties. New EuS and GdS single source precursors (SSPs) were synthesized, characterized, and employed to synthesize Eu1-xGdxS NCs by decomposition in oleylamine and trioctylphosphine at 290 °C. The doped NCs were characterized using X-ray diffraction, transmission electron miscroscopy and scanning transmission electron microscopy, which supports the uniform distribution of Gd dopants through electron energy loss spectroscopy (EELS) mapping. X-ray absorption spectroscopy (XAS) revealed the dopant ions in Eu1-xGdxS NCs to be predominantly Gd3+. NCs with a variety of doping ratios of Gd (0 ≤ x < 1) were systematically studied using vibrating sample magnetometry and the observed magnetic properties were correlated with the Gd doping levels (x) as quantified with ICP-AES. Enhancement of the Curie temperature (TC) was observed for samples with low Gd concentrations (x ≤ 10 %) with a maximum TC of 29.4 K observed for NCs containing 5.3 % Gd. Overall, the observed TC, Weiss temperature (θ), and hysteretic behavior correspond directly to the doping level in Eu1-xGdxS NCs and the trends qualitatively follow those previously reported for bulk and thin film samples.
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影响因子：
2.7
作者：
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通讯作者：
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影响因子：
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作者：
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