Ligand Dynamics of Aqueous CdTe Nanocrystals at Room Temperature
Ligand Dynamics of Aqueous CdTe Nanocrystals at Room Temperature
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DOI：
10.1021/jp7121664
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发表时间：
2008-04
影响因子：
3.7
通讯作者：
Chunlei Wang;Hao Zhang;Junhu Zhang;Nana Lv;Minjie Li;Haizhu Sun;Bai Yang
中科院分区：
文献类型：
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作者：
Chunlei Wang;Hao Zhang;Junhu Zhang;Nana Lv;Minjie Li;Haizhu Sun;Bai Yang
在稀释法和pH法实验的基础上，我们论证了水相纳米晶(NCS)在室温下可能的配位动力学。在储存过程中，溶液中多余的配体和镉−配体化合物在扩散到配位体壳层之前优先吸附在NC表面。虽然吸附层不能直接决定碳纳米管的光致发光性质，但它影响了自由配体和镉−配体化合物向配位层的扩散过程。稀释法、浓度法、储存法、pH调节法等不同的处理方法会影响吸附层厚度和配体的扩散行为，从而产生不同的荧光量子产率。
On the basis of dilution and pH experiments, in this paper we demonstrated the possible ligand dynamics of aqueous CdTe nanocrystals (NCs) at room temperature. During storage, the excess ligands and cadmium−ligand compounds in solution were preferentially adsorbed on NC surface before they diffused into the ligand shell. Though the adsorption layer could not directly determine the photoluminescence (PL) property of NCs, it affected the diffusion process of free ligands and cadmium−ligand compounds into the ligand layer. The treatments of dilution, concentration, storage, and pH adjustment were believed to affect the thickness of adsorption layer and the diffusion behavior of ligands and hence brought different PL quantum yields.