Dispersing perylene diimide/SWCNT hybrids: structural insights at the molecular level and fabricating advanced materials.
Dispersing perylene diimide/SWCNT hybrids: structural insights at the molecular level and fabricating advanced materials.
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DOI：
10.1021/jacs.5b03167
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发表时间：
2015-06
影响因子：
15
通讯作者：
Yael Tsarfati;V. Strauss;S. Kuhri;Elisha Krieg;H. Weissman;E. Shimoni;J. Baram;D. Guldi;B. Rybtchinski
中科院分区：
文献类型：
--
作者：
Yael Tsarfati;V. Strauss;S. Kuhri;Elisha Krieg;H. Weissman;E. Shimoni;J. Baram;D. Guldi;B. Rybtchinski
碳纳米管（CNT）的独特性质对于新兴应用是有利的。然而，CNT的不溶性阻碍了它们的潜力。已经测试了基于共价和非共价方法的方法以实现CNT的稳定分散体。非共价方法特别令人感兴趣，因为它们保留了CNT的结构和性质。我们报告的混合动力车，其中，二萘嵌苯二酰亚胺（PDI）的两亲非共价固定到单壁碳纳米管（SWCNT）。在两种不同的PDI衍生物PP 2b和PP 3a的存在下，将所得的杂化物在水和有机溶剂中分散和剥离。使用低温透射电子显微镜（cryo-TEM）的分散体进行了研究，提供了独特的结构的剥离的见解。在水分散液中，PP 2b在单壁碳纳米管上的组装呈螺旋状排列，而在有机分散液中，PP 2b和PP 3a在单壁碳纳米管上呈单层排列。通过稳态和时间分辨光谱探测分散体，揭示了在基态的可观的电荷重新分配，和在激发态的有效的电子转移从单壁碳纳米管到PDIs。我们还从PP 2b/SWCNT分散体制备了杂化材料。采用水分散液制备了超分子膜，并将其用于金纳米粒子的尺寸选择性分离。由有机分散体制备杂化巴克纸膜。在后者中，高导电性源于混合材料内增强的电子通信和有利的形态。我们的研究结果揭示了单壁碳纳米管/分散剂分子的相互作用，并介绍了一种通用的单壁碳纳米管基材料的溶液加工的通用方法。
The unique properties of carbon nanotubes (CNT) are advantageous for emerging applications. Yet, the CNT insolubility hampers their potential. Approaches based on covalent and noncovalent methodologies have been tested to realize stable dispersions of CNTs. Noncovalent approaches are of particular interest as they preserve the CNT's structures and properties. We report on hybrids, in which perylene diimide (PDI) amphiphiles are noncovalently immobilized onto single wall carbon nanotubes (SWCNT). The resulting hybrids were dispersed and exfoliated both in water and organic solvents in the presence of two different PDI derivatives, PP2b and PP3a. The dispersions were investigated using cryogenic transmission electron microscopy (cryo-TEM), providing unique structural insights into the exfoliation. A helical arrangement of PP2b assemblies on SWCNTs dominates in aqueous dispersions, while a single layer of PP2b and PP3a was found on SWCNTs in organic dispersions. The dispersions were probed by steady-state and time-resolved spectroscopies, revealing appreciable charge redistribution in the ground state, and an efficient electron transfer from SWCNTs to PDIs in the excited state. We also fabricated hybrid materials from the PP2b/SWCNT dispersions. A supramolecular membrane was prepared from aqueous dispersions and used for size-selective separation of gold nanoparticles. Hybrid buckypaper films were prepared from the organic dispersions. In the latter, high conductivity results from enhanced electronic communication and favorable morphology within the hybrid material. Our findings shed light onto SWCNT/dispersant molecular interactions, and introduce a versatile approach toward universal solution processing of SWCNT-based materials.