The influence of surface composition of quantum dots fluorescence sensing on the discriminative detection of bivalent Mn and Cu cations
The influence of surface composition of quantum dots fluorescence sensing on the discriminative detection of bivalent Mn and Cu cations
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DOI：
10.1039/c4ay02245a
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发表时间：
2014-11
影响因子：
3.1
通讯作者：
Chunlei Wang;Shuhong Xu;Shujie Zhou;Zhuyuan Wang;Yiping Cui
中科院分区：
文献类型：
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作者：
Chunlei Wang;Shuhong Xu;Shujie Zhou;Zhuyuan Wang;Yiping Cui
研究量子点表面的化学反应是量子点在离子环境中应用的基础。基于我们最近关于通过QD荧光传感区分检测Mn（II）和Cu（II）的报告，本文重点关注在不同QD表面修饰条件下与Mn（II）或Cu（II）的QD表面化学反应。使用了两种类型的QD。一种是表面富含Cd配体复合物的改性量子点。另一种是适度修饰的量子点，表面上既有裸露的Te原子，又有Cd-配体络合物。我们的研究结果表明，改性好的量子点进行化学反应与Cu（II），即，从量子点的Cu（II）取代镉。在这种情况下，Mn（II）与Cu（II）的区分检测的结果总是可信的。相比之下，对于适度修饰的量子点，似乎存在通过裸露的Te原子与Cu（II）或Mn（II）结合的新反应方式。这种新的反应方式主要发生在pH 10.3附近。因此，通过适度修饰的量子点区分检测Mn（II）和Cu（II）的结果是不可信的。
Investigating the chemical reactions at the surface of quantum dots (QDs) is fundamental for applications of QDs in ionic environments. On the basis of our recent report about the discriminative detection of Mn(II) from Cu(II) via QD fluorescence sensing, we herein focused on the QD surface chemical reactions with Mn(II) or Cu(II) at different QD surface modification conditions. Two types of QDs were used. One is well modified QDs with a surface rich in Cd-ligands complexes. Another is moderately modified QDs with both bared Te atoms and Cd-ligand complexes on the surface. Our results indicated that well modified QDs underwent a chemical reaction with Cu(II), namely, the substitution of Cd from QDs by Cu(II). In this case, the results of discriminative detection of Mn(II) from Cu(II) is always believable. For moderately modified QDs in comparison, it appears there is a new reaction manner via combination of bared Te atoms with Cu(II) or Mn(II). This new reaction manner occurs mainly around pH 10.3. Consequently, the results of discriminative detection of Mn(II) from Cu(II) via moderately modified QDs is not believable.