Journal
NANO LETTERS
Volume 18, Issue 12, Pages 7991-7997Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03979
Keywords
Cycloparaphenylene; nanohoop; carbon nanotube; self-assembly; epitaxial growth; vertical alignment
Categories
Funding
- Murdock Charitable Trust
- National Science Foundation (NSF) [CHE-1808791, CHE-1800586]
- NSF [CHE-1531189, DMR-1532225, CHE-1625529]
- University of Oregon
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Extended carbon nanostructures, such as carbon nanotubes (CNTs), exhibit remarkable properties but are difficult to synthesize uniformly. Herein, we present a new class of carbon nanomaterials constructed via the bottom up self-assembly of cylindrical, atomically precise small molecules. Guided by supramolecular design principles and circle packing theory, we have designed and synthesized a fluorinated nanohoop that, in the solid state, self-assembles into nanotube-like arrays with channel diameters of precisely 1.63 nm. A mild solution-casting technique is then used to construct vertical forests of these arrays on a highly ordered pyrolytic graphite (HOPG) surface through epitaxial growth. Furthermore, we show that a basic property of nanohoops, fluorescence, is readily transferred to the bulk phase, implying that the properties of these materials can be directly altered via precise functionalization of their nanohoop building blocks. The strategy presented is expected to have broader applications in the development of new graphitic nanomaterials with g-rich cavities reminiscent of CNTs.
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