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Mixed Organic Ligand Shells: Controlling the Nanoparticle Surface Morphology toward Tuning the Optoelectronic Properties.
Small ( IF 13.0 ) Pub Date : 2019-11-28 , DOI: 10.1002/smll.201903729 Christian Henkel 1 , Judith E Wittmann 2 , Johannes Träg 3 , Johannes Will 4, 5 , Lisa M S Stiegler 6 , Peter Strohriegl 7 , Andreas Hirsch 6 , Tobias Unruh 4, 5 , Dirk Zahn 3 , Marcus Halik 2 , Dirk M Guldi 1
Small ( IF 13.0 ) Pub Date : 2019-11-28 , DOI: 10.1002/smll.201903729 Christian Henkel 1 , Judith E Wittmann 2 , Johannes Träg 3 , Johannes Will 4, 5 , Lisa M S Stiegler 6 , Peter Strohriegl 7 , Andreas Hirsch 6 , Tobias Unruh 4, 5 , Dirk Zahn 3 , Marcus Halik 2 , Dirk M Guldi 1
Affiliation
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Precise control over the ratio of perylene bisimide (PBI) monomers and aggregates, immobilized on alumina nanoparticle (NP) surfaces, is demonstrated. Towards this goal, phosphonic acid functionalized PBI derivatives (PA-PBI) are shown to self-assemble into stoichiometrically mixed monolayers featuring aliphatic, glycolic, or fluorinated phosphonic acid ligands, serving as imbedding matrix (PA-M) to afford core-shell NPs. Different but, nevertheless, defined PBI monomer/aggregate composition is achieved by either the variation in the PA-PBI to PA-M ratios, or the utilization of different PA-Ms. Various steady-state as well as time-resolved spectroscopy techniques are applied to probe the core-shell NPs with respect to changes in their optical properties upon variations in the shell composition. To this end, the ratio between monomer and excimer-like emission assists in deriving information on the self-assembled monolayer composition, local ordering, and corresponding aggregate content. With the help of X-ray reflectivity measurements, accompanied by molecular dynamics simulations, the built-up of the particle shells, in general, and the PBI aggregation behavior, in particular, are explored in depth.
中文翻译：
混合有机配体壳：控制纳米粒子的表面形态，以调整光电性能。
证明了精确控制固定在氧化铝纳米颗粒（NP）表面的bi双酰亚胺（PBI）单体和聚集体的比例。为了实现这一目标，已证明膦酸官能化的PBI衍生物（PA-PBI）可自组装为具有脂肪族，乙醇酸或氟化膦酸配体的化学计量混合单层，用作嵌入基质（PA-M）以提供核-壳NP 。通过改变PA-PBI与PA-M的比例或利用不同的PA-M，可实现不同但定义的PBI单体/骨料组成。应用各种稳态和时间分辨光谱技术来探测核-壳NP在壳组成变化时其光学性质的变化。为此，单体和受激准分子发射之间的比率有助于获得有关自组装单分子层组成，局部有序化和相应聚集体含量的信息。在X射线反射率测量的帮助下，伴随分子动力学模拟，通常深入研究了颗粒壳的形成，特别是PBI聚集行为。
更新日期：2020-01-16
中文翻译：
混合有机配体壳：控制纳米粒子的表面形态，以调整光电性能。
证明了精确控制固定在氧化铝纳米颗粒（NP）表面的bi双酰亚胺（PBI）单体和聚集体的比例。为了实现这一目标，已证明膦酸官能化的PBI衍生物（PA-PBI）可自组装为具有脂肪族，乙醇酸或氟化膦酸配体的化学计量混合单层，用作嵌入基质（PA-M）以提供核-壳NP 。通过改变PA-PBI与PA-M的比例或利用不同的PA-M，可实现不同但定义的PBI单体/骨料组成。应用各种稳态和时间分辨光谱技术来探测核-壳NP在壳组成变化时其光学性质的变化。为此，单体和受激准分子发射之间的比率有助于获得有关自组装单分子层组成，局部有序化和相应聚集体含量的信息。在X射线反射率测量的帮助下，伴随分子动力学模拟，通常深入研究了颗粒壳的形成，特别是PBI聚集行为。
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