Semiconductor Quantum Dots as Photocatalysts for Controlled Light-Mediated Radical Polymerization
Semiconductor Quantum Dots as Photocatalysts for Controlled Light-Mediated Radical Polymerization
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DOI：
10.1021/acsmacrolett.7b00968
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发表时间：
2018-02-01
影响因子：
7.015
通讯作者：
Egap, Eilaf
中科院分区：
文献类型：
--
作者：
Huang, Yiming;Zhu, Yifan;Egap, Eilaf
光介导自由基聚合得益于光氧化还原催化剂的快速发展，与传统的热聚合相比具有许多独特的优点。然而，大多数工作依赖于分子光氧化还原催化剂或昂贵的过渡金属。我们利用半导体量子点（QD）作为一种新型的自由基聚合催化剂，可以利用自然光的能力。（甲基）丙烯酸酯，苯乙烯和嵌段共聚物的结构的聚合被证明，连同由光源的聚合的时间控制。光致发光实验表明，光激发量子点对溴代烷引发剂的还原是光介导自由基聚合的关键。
Light-mediated radical polymerization has benefited from the rapid development of photoredox catalysts and offers many exceptional advantages over traditional thermal polymerizations. Nevertheless, the majority of the work relies on molecular photoredox catalysts or expensive transition metals. We exploited the capability of semiconductor quantum dots (QD) as a new type of catalyst for the radical polymerization that can harness natural sunlight. Polymerizations of (meth)acrylates, styrene, and construction of block copolymers were demonstrated, together with temporal control of the polymerization by the light source. Photoluminescence experiments revealed that the reduction of alkyl bromide initiator by photo excited QD is the key to this light-mediated radical polymerization.