Chemoaffinity-Mediated Synthesis of NaRES2-Based Nanocrystals as Versatile Nano-Building Blocks and Durable Nano-Pigments
2012
Ding, Yi | Gu, Jun | Zhang, Tao | Yin, An-Xiang | Yang, Lu | Zhang, Ya-Wen | Yan, Chun-Hua
In this article, we present a chemoaffinity-mediated synthetic strategy toward trivalent rare earth (RE) sulfides-based nanocrystals with poor affinity between cation and anion (i.e., RE³⁺ and S²–). With the affinity mediation among multiple constituents based on hard and soft acid and base theory, we synthesized a series of monodisperse NaRES₂ nanocrystals (RE = La to Lu, Y). The revelation of the nanocrystal growth mechanism from both experimental evidence and crystal structure modeling has enabled a robust control over the sizes and morphologies of the nanocrystals. This principle of chemoaffinity has also promised the synthesis of well-defined but even more complex RE-based hetero-nanostructures (i.e. NaLaS₂-Au, Au@NaLaS₂, NaLaS₂@Ag₂S, Au@NaLaS₂@Ag₂S) with tunable optical properties. Furthermore, this synthetic method has yielded durable NaCeS₂-based red nano-pigments under ambient conditions, with superior brightness and permeability in polydimethylsiloxane.
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