Fullerene oxidation and clustering in solution induced by light.
Fullerene oxidation and clustering in solution induced by light.
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DOI：
10.1016/j.jcis.2015.01.005
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发表时间：
2015-05
影响因子：
9.9
通讯作者：
R. Dattani;Kirsty F. Gibson;S. Few;Aaron J Borg;Peter A. DiMaggio;J. Nelson;S. Kazarian;J. Cabral
中科院分区：
文献类型：
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作者：
R. Dattani;Kirsty F. Gibson;S. Few;Aaron J Borg;Peter A. DiMaggio;J. Nelson;S. Kazarian;J. Cabral
我们通过静态和动态光散射、FTIR、NMR和质谱以及量子化学计算研究了富勒烯溶液的环境稳定性。我们发现，可见光照射的富勒烯溶液中的甲苯，一种良好的溶剂，在环境实验室条件下的结果在C 60氧化形成富勒烯环氧化物，并随后导致富勒烯集群在溶液中。即使在没有进一步照明的情况下，团簇也会随着时间的推移而生长，并且可以在201天内达到从100 nm到μ m的尺度。静态光散射表明，所得的聚集体是分形的，具有特征幂律（DF），在光暴露期间从约1.3增加到2.0。团簇由弱库仑相互作用结合，并且被发现是可逆的，通过机械搅拌和热应力分解，并且随着时间的推移而重整。我们的研究结果是有关的复合材料和有机photoprophics，其再现性和性能的溶液处理需要控制的富勒烯溶液在储存条件下的稳定性。
We investigate the environmental stability of fullerene solutions by static and dynamic light scattering, FTIR, NMR and mass spectroscopies, and quantum chemical calculations. We find that visible light exposure of fullerene solutions in toluene, a good solvent, under ambient laboratory conditions results in C 60 oxidation to form fullerene epoxides, and subsequently causes fullerene clustering in solution. The clusters grow with time, even in absence of further illumination, and can reach dimensions from≈ 100 nm to the μ m scale over≈ 1 day. Static light scattering suggests that resulting aggregates are fractal, with a characteristic power law (d f) that increases from approximately 1.3 to 2.0 during light exposure. The clusters are bound by weak Coulombic interactions and are found to be reversible, disintegrating by mechanical agitation and thermal stress, and reforming over time. Our findings are relevant to the solution processing of composites and organic photovoltaics, whose reproducibility and performance requires control of fullerene solution stability under storage conditions.