†Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), Cantoblanco 28049, Madrid, Spain.
‡Instituto de Ciencias de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Calle Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Madrid, Spain.
ACS Appl Mater Interfaces. 2015 Apr 1;7(12):6935-45. doi: 10.1021/acsami.5b00820. Epub 2015 Mar 19.
SiO2 encapsulation of alloyed CdSeZnS nanocrystals (NCs) shows differences in terms of optical properties and luminescence quantum yield, depending on the surface composition, size, and ligand content. In this work, emphasis has been placed on the fine control required to obtain luminescent SiO2 encapsulated NCs by studying the role of oleic acid (OA), stearic acid (SA), and dodecanethiol (DDT) ligands on the alloyed NCs. While the use of anchored DDT molecules is essential to preserve the optical properties, intercalated OA and SA play a critical role for SiO2 nucleation, as stated by (1)H NMR (including DOSY and NOESY) spectroscopy. These results emphasize the importance of surface chemistry in NCs; it is crucial to control their reactivity, and therefore their impact, in different applications, from optics to biomedicine.
SiO2 对合金化 CdSeZnS 纳米晶体 (NCs) 的封装会影响光学性质和荧光量子产率，具体取决于表面组成、尺寸和配体含量。在这项工作中，重点研究了油酸 (OA)、硬脂酸 (SA) 和十二硫醇 (DDT) 配体在合金 NCs 上的作用，以实现对发光 SiO2 封装 NCs 的精细控制。虽然使用锚定的 DDT 分子对于保持光学性质是必不可少的，但 (1)H NMR (包括 DOSY 和 NOESY) 光谱表明，插层的 OA 和 SA 对于 SiO2 的成核起着关键作用。这些结果强调了表面化学在 NCs 中的重要性；控制其反应性，从而控制其在从光学到生物医学等不同应用中的影响，至关重要。
