Host-guest chemistry for tuning colloidal solubility, self-organization and photoconductivity of inorganic-capped nanocrystals.
Host-guest chemistry for tuning colloidal solubility, self-organization and photoconductivity of inorganic-capped nanocrystals.
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DOI：
10.1038/ncomms10142
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发表时间：
2015-12-09
影响因子：
16.6
通讯作者：
Kovalenko MV
中科院分区：
文献类型：
--
作者：
Bodnarchuk MI;Yakunin S;Piveteau L;Kovalenko MV
用无机封端配体官能化的胶态无机纳米晶体（NC），例如金属硫族化物络合物（MCC），最近已经出现作为多功能光电材料。制备的高度带电的MCC封端的NC仅可分散在高极性溶剂中，并且缺乏形成长程有序NC超晶格的能力。在这里，我们报告了一个简单的和一般的方法，基于主-客体协调MCC封端的NC与大环醚（冠醚和穴状配体），使无机封端的NC在任何极性的溶剂中的溶解，并提高形成NC超晶格的能力。有机分子的电晕也可以作为一个方便的旋钮，用于微调的电荷传输和光电导的薄膜的纳米碳。特别是，高红外光子探测率高达3.3 × 1011琼斯与快速响应（3分贝截止在3 kHz）在1,200 nm的波长下获得与PbS/K3 AsS 4/癸基-18-冠-6 NC的薄膜。 胶体无机配体官能化纳米晶体的高极性对于它们的加工可能是有问题的，限制了它们的光电应用。在这里，通过与大环化合物的络合，作者使这种纳米晶体具有广泛的两亲性，并从各种溶剂中进行加工。
Colloidal inorganic nanocrystals (NCs), functionalized with inorganic capping ligands, such as metal chalcogenide complexes (MCCs), have recently emerged as versatile optoelectronic materials. As-prepared, highly charged MCC-capped NCs are dispersible only in highly polar solvents, and lack the ability to form long-range ordered NC superlattices. Here we report a simple and general methodology, based on host–guest coordination of MCC-capped NCs with macrocyclic ethers (crown ethers and cryptands), enabling the solubilization of inorganic-capped NCs in solvents of any polarity and improving the ability to form NC superlattices. The corona of organic molecules can also serve as a convenient knob for the fine adjustment of charge transport and photoconductivity in films of NCs. In particular, high-infrared-photon detectivities of up to 3.3 × 1011 Jones with a fast response (3 dB cut-off at 3 kHz) at the wavelength of 1,200 nm were obtained with films of PbS/K3AsS4/decyl-18-crown-6 NCs. The high polarity of colloidal inorganic-ligand-functionalized nanocrystals can be problematic for their processing, limiting their optoelectronic applications. Here, by complexation with macrocycles, the authors enabled broad amphiphilicity of such nanocrystals and processing from a variety of solvents.