Nakagawa Fumiko, Saruyama Masaki, Takahata Ryo, Sato Ryota, Matsumoto Kenshi, Teranishi Toshiharu
Graduate School of Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
J Am Chem Soc. 2022 Apr 6;144(13):5871-5877. doi: 10.1021/jacs.1c12456. Epub 2022 Mar 29.
Colloidal crystals (CCs) constructed from inorganic nanoparticle (NP) building blocks exhibit properties that cannot be realized from isolated NPs or corresponding bulk counterparts. Because the arrangement of NPs in CCs is crucial in the CC's collective properties, development of a procedure to modulate the assembly of NP constituents is important. We demonstrate rapid formation of nickel (phosphide) CCs with tunable crystallinity through van der Waals force-driven spontaneous self-assembly of NPs in a facile one-pot colloidal synthesis. The quantity of size-regulating reagent (tri--octylphosphine) modulates the assembly of NPs from ordered close-packed to a disordered configuration in CCs. Synchrotron-based small-angle X-ray scattering revealed that the size uniformity of the NPs determines the crystallinity of CCs, indicating the importance of regulating the growth kinetics of NPs during the synthesis. Our work will be useful for universal scalable preparation of CCs from a variety of materials and structures, with tunable concerted properties.
由无机纳米颗粒构建而成的胶体晶体（CCs）展现出了孤立纳米颗粒或相应块状材料所无法实现的特性。由于纳米颗粒在CCs中的排列对于CCs的集体性质至关重要，因此开发一种调节纳米颗粒成分组装的方法很重要。我们展示了通过在简便的一锅法胶体合成中，纳米颗粒通过范德华力驱动的自发自组装快速形成具有可调结晶度的镍（磷化物）CCs。尺寸调节剂（三辛基膦）的量将CCs中纳米颗粒的组装从有序密堆积调节为无序构型。基于同步加速器的小角X射线散射表明，纳米颗粒的尺寸均匀性决定了CCs的结晶度，这表明在合成过程中调节纳米颗粒生长动力学的重要性。我们的工作将有助于从各种材料和结构通用可扩展地制备具有可调协同性质的CCs。
