Functional bisimide dyes bound via electrostatic interactions to oxide nanostructures generated by AFM lithography
Functional bisimide dyes bound via electrostatic interactions to oxide nanostructures generated by AFM lithography
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DOI：
10.1016/j.apsusc.2013.12.094
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发表时间：
2014-11
影响因子：
6.7
通讯作者：
T. Baumgärtel;S. Rehm;F. Würthner;C. Borczyskowski;H. Graaf
中科院分区：
文献类型：
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作者：
T. Baumgärtel;S. Rehm;F. Würthner;C. Borczyskowski;H. Graaf
氧化硅纳米结构已经通过选择性结合带正电荷的双酰亚胺染料衍生物而功能化。该结构是通过AFM纳米光刻通过局部阳极氧化（LAO）的十二烷基封端的硅和负电荷，由于生产过程。因此，阳离子精胺官能化的苝酰亚胺（sf-PBI）分子可以通过静电相互作用结合到结构上。通过AFM高度测量和荧光显微镜手段验证了LAO纳米结构上的sf-PBI单元的组装。从染料官能化的氧化物的发射光谱表明，分子能够形成准分子。这些准分子的特征在于宽且无特征的红移发射带和增加的激发态寿命。与不带电的氧化硅上的sf-PBI膜的发射相反，发现受激准分子发射在低温下强烈降低。这可能是由于分子对LAO氧化物的静电吸引而导致的非常紧密的结合所解释的。
Silicon oxide nanostructures have been functionalized by selective binding of a positively charged bisimide dye derivative. The structures were prepared by AFM nanolithography via local anodic oxidation (LAO) of dodecyl-terminated silicon and are negatively charged due to the production process. Therefore cationic spermine-functionalized perylene bisimide (sf-PBI) molecules can be bound to the structures by electrostatic interactions. The assembly of the sf-PBI units on the LAO nanostructures is verified by AFM height measurements and means of fluorescence microscopy. Emission spectra from the dye-functionalized oxide show that the molecules are able to form excimers. These excimers are characterized by a broad and featureless red-shifted emission band and an increased excited state life time. In contrast to the emission of sf-PBI films on uncharged silicon oxide, the excimer emission was found to decrease strongly low temperatures. This might be explained by a very tight binding due to the electrostatic attraction of the molecules to the LAO oxide.