Synthesis and characterization of manganese-doped silicon nanoparticles: Bifunctional paramagnetic-optical nanomaterial
Synthesis and characterization of manganese-doped silicon nanoparticles: Bifunctional paramagnetic-optical nanomaterial
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DOI：
10.1021/ja074144q
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发表时间：
2007-09-05
影响因子：
15
通讯作者：
Kauzlarich, Susan M.
中科院分区：
文献类型：
--
作者：
Zhang, Xiaoming;Brynda, Marcin;Kauzlarich, Susan M.
Mn掺杂的Si纳米粒子已通过低温溶液路线合成，其特征在于通过X射线粉末衍射，透射电子显微镜，光学和发射光谱，并通过电子顺磁共振（EPR）。粒径为4 nm，表面被辛基封端。Mn掺杂5%导致绿色发射，其量子产率略低于通过相同方法制备的未掺杂的Si纳米颗粒。通过EPR超精细证实了Mn ~（2+）掺杂到纳米粒子中，并通过超快瞬态吸收光谱研究了其载流子动力学。两种技术都与纳米颗粒表面上或接近纳米颗粒表面的Mn 2+一致。
Mn doped Si nanoparticles have been synthesized via a low-temperature solution route and characterized by X-ray powder diffraction, transmission electron microscopy, optical and emission spectroscopy, and by electron paramagnetic resonance (EPR). The particle diameter was 4 nm, and the surface was capped by octyl groups. Mn doping at 5% resulted in a green emission with a slightly lower quantum yield than undoped Si nanoparticles prepared by the same method. Mn2+ doped into the nanoparticle is confirmed by EPR hyperfine, and the charge carrier dynamics were probed by ultrafast transient absorption spectroscopy. Both techniques are consistent with Mn2+ on or close to the surface of the nanoparticle.