Gas-phase grafting for the multifunctional surface modification of silicon quantum dots
Gas-phase grafting for the multifunctional surface modification of silicon quantum dots
复制标题
硅量子点多功能表面改性的气相接枝
DOI：
10.1039/d2nr04902c
复制
发表时间：
2022
期刊：
影响因子：
6.7
通讯作者：
Mangolini, Lorenzo
中科院分区：
文献类型：
--
作者：
Schwan, Joseph;Wang, Kefu;Tang, Ming Lee;Mangolini, Lorenzo
光子上转换在无机量子点系统中的应用在太阳能转换、生物成像和光动力学治疗中具有重要意义。实现高上转换效率不仅需要高质量的无机纳米粒子，还需要精确控制其表面官能团。气相表面功能化提供了一个新的途径控制小无机纳米粒子的表面。在这方面的贡献，我们利用一步低温等离子体技术的合成和飞行中部分功能化的硅量子点与烷基链。然后通过热氢化硅烷化用9-乙烯基蒽进一步改性部分官能化的表面，导致9-乙基蒽（9 EA）基团的接枝。我们已经发现，量子点溶解度所需的最小烷基配体密度也给出了最大的上转换量子产率，达到17%的硅量子点与Si-十二烷基链和平均3 9 EA分子每个颗粒。
Photon upconversion in systems incorporating inorganic quantum dots (QDs) is of great interest for applications in solar energy conversion, bioimaging, and photodynamic therapy. Achieving high up-conversion efficiency requires not only high-quality inorganic nanoparticles, but also precise control of their surface functional groups. Gas-phase surface functionalization provides a new pathway towards controlling the surface of small inorganic nanoparticles. In this contribution, we utilize a one-step low-temperature plasma technique for the synthesis and in-flight partial functionalization of silicon QDs with alkyl chains. The partially functionalized surface is then modified further with 9-vinylanthracene via thermal hydrosilylation resulting in the grafting of 9-ethylanthracene (9EA) groups. We have found that the minimum alkyl ligand density necessary for quantum dot solubility also gives the maximum upconversion quantum yield, reaching 17% for silicon QDs with Si-dodecyl chains and an average of 3 9EA molecules per particle.