Multifunctional and Tunable Surfaces Based on Pyrene Functionalized Nanoparticles
Multifunctional and Tunable Surfaces Based on Pyrene Functionalized Nanoparticles
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DOI：
10.1002/admi.201801930
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发表时间：
2019-01
影响因子：
5.4
通讯作者：
Judith E. Wittmann;Lisa M. S. Stiegler;Christian Henkel;Johannes Träg;K. Götz;T. Unruh;D. Zahn;A. Hirsch;D. Guldi;M. Halik
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文献类型：
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作者：
Judith E. Wittmann;Lisa M. S. Stiegler;Christian Henkel;Johannes Träg;K. Götz;T. Unruh;D. Zahn;A. Hirsch;D. Guldi;M. Halik
芘，固定在氧化铝纳米粒子表面的光学性质的调谐，证明。为此，膦酸官能化的芘衍生物显示出自组装成化学计量混合的单层，其特征在于亲水性、疏水性或亲氟性膦酸配体，并根据分子混合比和配体单体、激基缔合物的性质或两者的相互发射形成限定的核-壳杂化物。光谱观测结果由染料分子相对于其固定的特定锚点的相应迁移率以及由此产生的形成准分子的概率来解释，并得到分子动力学模拟、X射线反射率测量和温度依赖性稳态荧光测定的支持。就发射颜色变化和/或荧光的开关切换的额外调谐而言，通过应用两亲物来进行核-壳-壳体系的形成。一般概念完全可转移到纳米颗粒的复员膜，从而实现可切换的固态表面。
The tuning of the optical properties of pyrene, immobilized on alumina nanoparticle surfaces, is demonstrated. To this end, phosphonic acid functionalized pyrene derivatives are shown to self‐assemble into stoichiometrically mixed monolayers featuring hydrophilic, hydrophobic, or fluorophilic phosphonic acid ligands and to form defined core–shell hybrids depending on the molecular mixing ratio and the nature of the ligand monomer, excimer, or mutual emission of both evolved. The spectroscopic observations are explained by the respective mobility of the dye molecules with respect to their fixed, specific anchor points and the resulting probability to form excimers and are supported by molecular dynamic simulations, X‐ray reflectivity measurements, and temperature‐dependent steady‐state fluorescence assays. In terms of an additional tuning of the emission color change and/or the on‐off switching of the fluorescence, the formation of core–shell–shell system is carried out by applying amphiphiles. The general concept is fully transferable to demobilized films of nanoparticles, thereby enabling a switchable solid‐state surface.