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Fullerene

About: Fullerene is a research topic. Over the lifetime, 12723 publications have been published within this topic receiving 359173 citations.


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Journal ArticleDOI
11 Feb 1994-Science
TL;DR: A method is proposed that could increase the efficiency of the process of noble gas insertion into C60 and provide a more general means to create endohedral fullerene compounds.
Abstract: On the basis of semiempirical and high-level ab initio calculations, theoretical evidence is presented of a "window" mechanism operable on the surface of C60 and other fullerenes. Through this mechanism, large holes may be formed in fullerenes excited to their triplet state, openings through which atoms and small molecules can pass. This work provides a theoretical foundation for experiments that have prepared endohedral noble gas compounds of C60 under thermal excitation. A method is proposed that could increase the efficiency of the process of noble gas insertion into C60 and provide a more general means to create endohedral fullerene compounds.

128 citations

Journal ArticleDOI
TL;DR: Two 2D supramolecular structures of macrocycle 1 and 1/C60 obtained on HOPG by self-assembly under ambient conditions and investigated by high-resolution STM show that the donor-acceptor interaction between C60 and the electron-rich units of the ring is the dominant factor for the structure formation.
Abstract: Two 2D supramolecular structures of macrocycle 1 and 1/C60 have been obtained on HOPG by self-assembly under ambient conditions and investigated by high-resolution STM. The monolayers of 1 are characterized by structures with perfect ordering over relatively large areas. In the case of 1/C60, the size of the macrocycle 1 and the presence of two individual bithiophene units per ring lead in the final superstructure to a 1:2 stoichiometry. The fullerenes are not trapped at the graphite surface inside the macrocyclic holes but are located around the periphery of the bithiophene units. This clearly shows that the donor−acceptor interaction between C60 and the electron-rich units of the ring is the dominant factor for the structure formation.

128 citations

Journal ArticleDOI
TL;DR: This work introduces a new strategy for improving the conductivity of solution-processed n-type organic thermoelectrics by adapting the polarity of fullerene derivatives to enhance the miscibility of the host/dopant system at a nanoscale level and the high electrical conductivity.
Abstract: In this contribution, for the first time, the polarity of fullerene derivatives is tailored to enhance the miscibility between the host and dopant molecules. A fullerene derivative with a hydrophilic triethylene glycol type side chain (PTEG-1) is used as the host and (4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl)dimethylamine n-DMBI) as the dopant. Thereby, the doping efficiency can be greatly improved to around 18% (<1% for a nonpolar reference sample) with optimized electrical conductivity of 2.05 S cm-1 , which represents the best result for solution-processed fullerene derivatives. An in-depth microstructural study indicates that the PTEG-1 molecules readily form layered structures parallel to the substrate after solution processing. The fullerene cage plane is alternated by the triethylene glycol side chain plane; the n-DMBI dopants are mainly incorporated in the side chain plane without disturbing the π-π packing of PTEG-1. This new microstructure, which is rarely observed for codeposited thin films from solution, formed by PTEG-1 and n-DMBI molecules explains the increased miscibility of the host/dopant system at a nanoscale level and the high electrical conductivity. Finally, a power factor of 16.7 µW m-1 K-2 is achieved at 40% dopant concentration. This work introduces a new strategy for improving the conductivity of solution-processed n-type organic thermoelectrics.

128 citations

Journal ArticleDOI
TL;DR: In this article, the interaction of small copper clusters with polycyclic aromatic hydrocarbons (PAHs) was shown to form carbon nanotubes and encapsulated copper nanowires.
Abstract: A method using a hydrogen arc for synthesizing large quantities of carbon nanotubes filled with pure copper is reported. The interaction of small copper clusters with polycyclic aromatic hydrocarbons (PAHs) is shown to form carbon nanotubes and encapsulated copper nanowires. The effectiveness of this model is demonstrated by showing that no copper filled nanotubes are formed in a helium arc that does not generate PAHs. A direct proof of this model is demonstrated by using pyrene, a PAH molecule, to grow carbon nanotubes and encapsulated copper nanowires.

128 citations

Journal ArticleDOI
TL;DR: In this article, a chimney-type phase diagram was identified in the MWNT/E7 mixture over a narrow range of ∼ 0.1 − 0.2% MWNT concentration.
Abstract: Phase diagrams of multi‐wall carbon nanotube (MWNT)/nematic liquid crystal (E7) and buckminsterfullerene (C60‐I h)/nematic liquid crystal (E7) binary systems have been investigated by means of polarizing optical microscopy and differential scanning calorimetry. It was found that the isotropic–nematic phase transition temperature (T NI) of the liquid crystal component was enhanced by the incorporation of MWNT within a small composition gap. A chimney‐type phase diagram can be identified in the MWNT/E7 mixture over a narrow range of ∼0.1–0.2% MWNT concentration. Upon substituting the nanotubes with isotropic fillers such as fullerene, the (C60‐I h)/E7 blend showed no discernible change of T NI in the same concentration range of the chimney of the MWNT/E7 mixture, suggesting a significant contribution of anisotropy (or the aspect ratio) of the nanotubes to the entropy of the system containing liquid crystal molecules. This enhanced T NI phenomenon may be attributed to anisotropic alignment of liquid crystal ...

127 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023542
20221,244
2021366
2020346
2019411
2018420