光催化
磷光
材料科学
自由基聚合
光化学
荧光
化学
物理
催化作用
聚合物
聚合
有机化学
量子力学
作者
Ping Wang,Gao Min,Xiliang Luo,Yingxiang Zhai,Nicolai Meckbach,Veronika Strehmel,Shujun Li,Zhijun Chen,Bernd Strehmel
标识
DOI:10.1002/anie.202402915
摘要
Sustainable carbon dots based on cellulose, particularly carboxymethyl cellulose (CMCCDs), were confined in an inorganic network resulting in CMCCDs@SiO2. This resulted in a material exhibiting long afterglow covering a time frame of several seconds also under air. Temperature-dependent emission spectra gave information on temperature-assisted delayed fluorescence (TADF) and room temperature phosphorescence (RTP) while photocurrent experiments provided a deeper understanding of charge availability in the dark period, and therefore, its availability on the photocatalyst surface. The photo-ATRP initiator, ethyl(bromo)phenyl acetate (EBPA), quenched the emission from the millisecond to the nanosecond time frame indicating participation of the triplet state in photoinduced electron transfer (PET). Both free radical and living radical polymerization based on photo-ATRP protocol worked successfully. Metal-free photo-ATRP resulted in chain extendable macroinitiators based on a reductive mechanism with either MMA or in combination with styrene. Addition of 9 ppm Cu2+ resulted in Mw/Mn of 1.4 while an increase to 72 ppm improved uniformity of the polymers; that is Mw/Mn=1.03. Complementary experiments with kerria laca confined materials, namely KCDs@SiO2, provided similar results. Deposition of Cu2+ (9 ppm) on the photocatalyst surface explains better uniformity of the polymers formed in the ATRP protocol.
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