Purification and In Situ Ligand Exchange of Metal-Carboxylate-Treated Fluorescent InP Quantum Dots via Gel Permeation Chromatography
Purification and In Situ Ligand Exchange of Metal-Carboxylate-Treated Fluorescent InP Quantum Dots via Gel Permeation Chromatography
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DOI：
10.1021/acs.jpclett.7b01772
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发表时间：
2017-09-07
影响因子：
5.7
通讯作者：
Greytak, Andrew B.
中科院分区：
文献类型：
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作者：
Roberge, Adam;Stein, Jennifer L.;Greytak, Andrew B.
最近，在 InP 量子点 (QD) 中添加 M2+ 路易斯酸 (M = Cd、Zn) 已被证明可以提高光致发光量子产率 (PL QY)。在这里，我们研究了该路易斯酸层对纯化和配体交换等合成后处理的稳定性。我们利用凝胶渗透色谱来纯化量子点样品并帮助配体交换反应。路易斯酸封端的颗粒对于纯化来说是稳定的并且保持增强的发光特性。我们通过将天然羧酸盐配体转换为磷酸盐配体，证明了量子点上成功的配体交换。暴露于周围环境后光谱的变化表明羧酸盐和膦酸盐封端的量子点仍然对空气敏感。
Recently the addition of M2+ Lewis acids (M = Cd, Zn) to InP quantum dots (QDs) has been shown to enhance the photoluminescence quantum yield (PL QY). Here we investigate the stability of this Lewis acid layer to postsynthetic processing such as purification and ligand exchange. We utilize gel permeation chromatography to purify the quantum-dot samples as well as to aid in the ligand-exchange reactions. The Lewis-acid-capped particles are stable to purification and maintain the enhanced luminescence properties. We demonstrate successful ligand exchange on the quantum dots by switching the native carboxylate ligands to phosphonate ligands. Changes in the optical spectra after exposure to ambient environment indicate that both carboxylate- and phosphonate-capped QDs remain air-sensitive.