Ligand-Induced Shape Transformation of PbSe Nanocrystals.
Ligand-Induced Shape Transformation of PbSe Nanocrystals.
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DOI：
10.1021/acs.chemmater.7b01103
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发表时间：
2017-05-09
期刊：
影响因子：
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通讯作者：
Vanmaekelbergh D
中科院分区：
文献类型：
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作者：
Peters JL;van den Bos KHW;Van Aert S;Goris B;Bals S;Vanmaekelbergh D
我们研究了具有可变 Pb-Se 化学计量和油酸配体密度的 PbSe 纳米晶体的表面化学和纳米晶体形状之间的关系。通过核磁共振和傅里叶变换红外吸收光谱监测油酸配体密度和结合构型，使我们能够量化每个NC表面附着的配体数量以及表面-Pb-油酸构型的性质。 PbSe纳米晶的三维形状是通过高角度环形暗场扫描透射电子显微镜结合原子计数方法获得的。我们表明，增强的油酸盐封端导致{111}面的稳定和延伸，以及从截断纳米立方体到截断八面体的晶体形状转变。
We present a study of the relation between the surface chemistry and nanocrystal shape of PbSe nanocrystals with a variable Pb-to-Se stoichiometry and density of oleate ligands. The oleate ligand density and binding configuration are monitored by nuclear magnetic resonance and Fourier transform infrared absorbance spectroscopy, allowing us to quantify the number of surface-attached ligands per NC and the nature of the surface–Pb–oleate configuration. The three-dimensional shape of the PbSe nanocrystals is obtained from high-angle annular dark field scanning transmission electron microscopy combined with an atom counting method. We show that the enhanced oleate capping results in a stabilization and extension of the {111} facets, and a crystal shape transformation from a truncated nanocube to a truncated octahedron.