Visible-light photocatalyzed cross-linking of diacetylene ligands by quantum dots to improve their aqueous colloidal stability.
Visible-light photocatalyzed cross-linking of diacetylene ligands by quantum dots to improve their aqueous colloidal stability.
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DOI：
10.1021/jp505340c
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发表时间：
2014-12-11
期刊：
影响因子：
--
通讯作者：
Heyes CD
中科院分区：
文献类型：
--
作者：
Götz MG;Takeuchi H;Goldfogel MJ;Warren JM;Fennell BD;Heyes CD
已知配体交联可改善纳米颗粒的胶体稳定性，特别是在水溶液中。然而，大多数交联是化学进行的，其中难以限制颗粒间交联，除非在低浓度下进行。光化学交联是一种有前途的方法，但通常需要紫外线（UV）光引发。使用这种高能光子可能对配体-纳米颗粒键相当弱的系统有害，就像常用的半导体量子点（QD）一样。在这里，我们介绍了一种新的方法，通过利用量子点吸收可见光后的光催化活性交联硫醇化配体的量子点。我们表明，使用可见光导致更好的配体交联，避免了问题的配体解离时发生的UV光照射。一旦交联，配体就会显着增强促进交联的相同量子点的胶体稳定性。
Ligand cross-linking is known to improve the colloidal stability of nanoparticles, particularly in aqueous solutions. However, most cross-linking is performed chemically, in which it is difficult to limit interparticle cross-linking, unless performed at low concentrations. Photochemical cross-linking is a promising approach but usually requires ultraviolet (UV) light to initiate. Using such high-energy photons can be harmful to systems in which the ligand–nanoparticle bond is fairly weak, as is the case for the commonly used semiconductor quantum dots (QDs). Here, we introduce a novel approach to cross-link thiolated ligands on QDs by utilizing the photocatalytic activity of QDs upon absorbing visible light. We show that using visible light leads to better ligand cross-linking by avoiding the problem of ligand dissociation that occurs upon UV light exposure. Once cross-linked, the ligands significantly enhance the colloidal stability of those same QDs that facilitated cross-linking.
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影响因子：
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通讯作者：
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影响因子：
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