Self-sorted photoconductive xerogels.
Self-sorted photoconductive xerogels.
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DOI：
10.1039/c6sc02644c
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发表时间：
2016-10-01
期刊：
影响因子：
8.4
通讯作者：
Adams DJ
中科院分区：
文献类型：
--
作者：
Draper ER;Lee JR;Wallace M;Jäckel F;Cowan AJ;Adams DJ
n型和p型胶凝因子之间的自分选导致有效的可见光活性光导干凝胶。我们表明，一个基于二萘嵌苯双酰亚胺（PBI）的胶凝剂形成自分类的混合物与基于芪的胶凝剂。为了形成自分选凝胶，我们使用由α-δ-内酯（GdL）水解为葡萄糖酸诱导的缓慢pH变化。我们证明，使用NMR光谱，紫外-可见光谱，流变学和粘度发生自分选。相应的干凝胶是光导的。重要的是，光电导膜的波长依赖性不同于仅由二萘嵌苯双酰亚胺形成的膜。的干凝胶的瞬态吸收光谱揭示了PBI的光谱中的变化在皮秒的时间尺度上的存在下，与PBI自由基阴离子被形成在10 ps内，当存在的芪。在可见光下形成PBI自由基阴离子的能力导致多组分凝胶的增强的光谱响应。因此，这些系统具有潜在的有用的可见光有源光电子学。
Self-sorting between n-type and p-type gelators results in effective visible-active photoconductive xerogels. We show that a perylene bisimide (PBI)-based gelator forms self-sorted mixtures with a stilbene-based gelator. To form the self-sorted gels, we use a slow pH change induced by the hydrolysis of glucono-δ-lactone (GdL) to gluconic acid. We prove that self-sorting occurs using NMR spectroscopy, UV-Vis spectroscopy, rheology, and viscometry. The corresponding xerogels are photoconductive. Importantly, the wavelength dependence of the photoconductive films is different to that of the films formed from the perylene bisimide alone. Transient absorption spectroscopy of the xerogels reveals changes in the spectrum of the PBI on the picosecond timescale in the presence of stilbene with a PBI radical anion being formed within 10 ps when the stilbene is present. The ability to form the PBI radical anion under visible light leads to the enhanced spectral response of the multicomponent gels. These systems therefore have potential as useful visible-active optoelectronics.