Synthesis and spectroscopic characterization of water-soluble Mn-doped ZnO(x)S(1-x) quantum dots.
Synthesis and spectroscopic characterization of water-soluble Mn-doped ZnO(x)S(1-x) quantum dots.
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DOI：
10.1016/j.saa.2011.08.045
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Fangfang Xue;Jiangong Liang;Heyou Han
中科院分区：
文献类型：
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作者：
Fangfang Xue;Jiangong Liang;Heyou Han
在氮气气氛下，以变性牛血清白蛋白为稳定剂，合成了一种无镉、水溶性的掺锰锌氧化物−xQD，并用X射线粉末衍射、紫外-可见吸收光谱、荧光发射光谱、高分辨电子显微镜和拉曼光谱对其进行了表征。X射线衍射谱表明，掺锰的−具有闪锌矿结构，其中的锰以二价锰(Mn2+)和三价锰(Mn3+)的形式存在(反应的中间产物)。高分辨透射电子显微镜显示，掺锰的−量子点的尺寸约为3.2±0.7 nm。荧光光谱表明，掺锰的−量子点有两个不同的发射带：缺陷相关发射和Mn2+相关发射，这两个发射带之间存在竞争过程。当掺杂量分别为1.0%和20%时，观察到较好的Mn2+(4T1-6A1)跃迁荧光信号，所制备的溶液在4℃下稳定6个月以上。该方法不含重金属离子或有毒试剂，具有稳定性好、环境友好的优点。
A non-cadmium and water-soluble Mn-doped ZnOxS1−xQDs was synthesized with denatured bovine serum albumin (dBSA) as stabilizer under nitrogen atmosphere, and the as-prepared products were characterized by X-ray powder diffraction (XRD), UV–vis absorption spectroscopy, fluorescence (FL) emission spectroscopy, high resolution transmission electronmicroscopy (HRTEM) and Raman spectrum. XRD patterns indicate that the Mn-doped ZnOxS1−xQDs have a zinc-blende structure, and that manganese emerges in the form of divalent manganese (Mn2+) and trivalent manganese (Mn3+) (the intermediate of the reaction). The size of Mn-doped ZnOxS1−xQDs is about 3.2±0.7nm according to HRTEM imaging. The FL spectra reveal that the Mn-doped ZnOxS1−xQDs have two distinct emission bands: the defect-related emission and the Mn2+-related emission, which exhibit a competing process. A good FL signal of the transition of Mn2+(4T1–6A1) is observed when the doping amounts are 1.0% and 20% respectively, and the as-prepared solutions are stable for more than 6 months at 4°C. This method has the advantages of good stability and environment-friendly stabilizer, for involving no heavy metal ions or toxic reagents.