Metal-free Inorganic Ligands for Colloidal Nanocrystals: S2-, HS-, Se2-, HSe-, Te2-, HTe-, TeS32-, OH-, and NH2- as Surface Ligands
Metal-free Inorganic Ligands for Colloidal Nanocrystals: S2-, HS-, Se2-, HSe-, Te2-, HTe-, TeS32-, OH-, and NH2- as Surface Ligands
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DOI：
10.1021/ja2029415
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发表时间：
2011-07-13
影响因子：
15
通讯作者：
Talapin, Dmitri V.
中科院分区：
文献类型：
--
作者：
Nag, Angshuman;Kovalenko, Maksym V.;Talapin, Dmitri V.
用不含金属的无机离子S2-、HS-、Se2-、HSe-、TE2-、HTE-、TeS32-、OH-和NH2-取代化学合成纳米晶表面的有机封端配体，合成了全无机胶体纳米晶。这些简单的配体附着在NC表面，并在极性溶剂中提供胶体稳定性。这种配体交换的多功能性已被证明用于各种不同尺寸和形状的半导体和金属纳米晶体。我们展示了皮尔逊的硬软酸碱(HSAB)原理的关键方面，该原理最初是为金属配位化合物开发的，可以应用于分子物种与纳米晶体表面的键合。使用小的无机配体代替传统的长碳氢化合物配体，促进了单个纳米晶体之间的电荷传输，并为胶体纳米结构的器件集成开辟了有趣的机会。
All-inorganic colloidal nanocrystals were synthesized by replacing organic capping ligands on chemically synthesized nanocrystals with metal-free inorganic ions such as S2-, HS-, Se2-, HSe-, Te2-, HTe-, TeS32-, OH- and NH2-. These simple ligands adhered to the NC surface and provided colloidal stability in polar solvents. The versatility of such ligand exchange has been demonstrated for various semiconductor and metal nanocrystals of different size and shape. We showed that the key aspects of Pearson's hard and soft acids and bases (HSAB) principle, originally developed for metal coordination compounds, can be applied to the bonding of molecular species to the nanocrystal surface. The use of small inorganic ligands instead of traditional ligands with long hydrocarbon tails facilitated the charge transport between individual nanocrystals and opened up interesting opportunities for device integration of colloidal nanostructures.