We report on the first case of the use of nonstoichiometric ternary (Ag–In–Zn–S) semiconductor nanocrystals as photoinitiators and photocatalysts of methyl methacrylate (MMA) polymerization. Two types of nanocrystals were tested, differing in their composition and characterized by red (λ_max = 731 nm) and green (λ_max = 528 nm) photoluminescence, respectively. Exploiting their reducing properties and capability of free radical generation we demonstrate that under ultraviolet (UV) radiation they effectively photoinitiate radical polymerization of MMA whereas under visible light (blue or green) they act as photocatalysts of living radical polymerization.

中文翻译：

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Ag-In-Zn-S合金纳米晶作为受控光介导自由基聚合的光催化剂

我们报告了第一个使用非化学计量三元（Ag-In-Zn-S）半导体纳米晶体作为甲基丙烯酸甲酯（MMA）聚合的光引发剂和光催化剂的案例。测试了两种类型的纳米晶体，它们的成分不同，并且分别具有红色（λ _max = 731 nm）和绿色（λ _max = 528 nm）光致发光的特征。利用它们的还原特性和产生自由基的能力，我们证明在紫外线 (UV) 辐射下，它们可以有效地光引发 MMA 自由基聚合，而在可见光（蓝色或绿色）下，它们可以充当活性自由基聚合的光催化剂。