Finely designed arrangements and photoelectronic properties of supramolecular nanocarbons composed of fullerenes and cyclic porphyrin dimers

CARBON

6 9 ( 2 0 1 4 ) 6 4 1 –6 4 2

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Tanso 260 Abstracts Preparation and structure analysis of double-wall carbon

dimers (M2-CPDPy, M = Ni, 2H) and fullerenes (C60, C70, PCBM

nanotubes encapsulating gadolinium trichloride nanowires

([6,6]-phenyl-C61-butyric acid methyl ester) and Li+@C60). The por-

a

b

c

Hiroyuki Muramatsu , Takuya Hayashi , Yoong Ahm Kim ,

phyrin dimers have self-assembling 4-pyridyl groups at the meso

Shingo Morimotod, Shuji Tsuruokad, Morinobu Endod

positions and include fullerenes in their cavities with high affin-

a

ities (Kassoc  105M 1). In crystals, C60  Ni2-CPDPy and PCBM  Ni2-

Department of Materials Science and Technology, Nagaoka University

of Technology, Japan b

Faculty of Engineering, Shinshu University, Japan

c

Department of Polymer & Fiber System Engineering, Chonnam

National University, South Korea d

Research Center for Exotic Nanocarbons, Shinshu University, Japan

CPDPy give self-assembled porphyrin nanotubes containing the linear arrays of fullerene molecules. These self-assemblies are induced mainly by the non-classical hydrogen bonds between pyridyl nitrogens and porphyin b C–H groups. On the other hand, in the crystals of C60  H4-CPDPy and C70  H4-CPDPy, the included fullerene molecules show zigzag chains through van der Waals contacts with each other. Due to these well-ordered arrays of C60, both crystals of C60 Ni2-CPDPy and C60  H4-CPDPy have high

We report the synthesis of high purity double-wall carbon nanotubes encapsulating GdCl3 nanowires (GdCl3@DWCNTs). The obtained GdCl3@DWCNTs were characterized by transmission electron microscopy (TEM), Raman spectroscopy, UV–VisNIR spectroscopy, and fluorescence spectroscopy. TEM measurements show that GdCl3 impurities were absent on the exterior of the tubes and bundles. Furthermore, significant changes of the optical properties of the inner tubes were not triggered by being filled with GdCl3 nanowires, which suggests that significant charge transfer does not occur between the encapsulated GdCl3

charge mobilities (l > 0.1 cm2 V

1

s 1). C60  H4-CPDPy shows

photoinduced electron transfer from the porphyrin moieties to C60 and photovoltaic activity with IPCEmax = 17% in photoelectrochemical cells. Moreover, the inclusion complexes of lithiumion-encapsulated C60(Li+@C60) and M2-CPDPy exhibit photoinduced charge separation with very long lifetimes reaching submillisecond order. [TANSO 2013 (No. 260) 284–91.] doi:10.1016/j.carbon.2013.12.008

and the inner tubes. Our results indicate that GdCl3@DWCNTs could be useful for various applications using the expected mag-

Synthesis of one-dimensional metallic sulfur inside the

netic properties of GdCl3 and almost unchanged optical proper-

nano-confined spaces of carbon nanotubes

ties of DWCNTs.

Toshihiko Fujimori, Katsumi Kaneko

[TANSO 2013 (No. 260) 279–83.] Research Center for Exotic Nanocarbons (JST), Shinshu University, Japan doi:10.1016/j.carbon.2013.12.007

Finely designed arrangements and photoelectronic properties of

Elemental sulfur, one of the most important natural resources

supramolecular nanocarbons composed of fullerenes and cyclic

in the chemical industry, has been used mainly for the production

porphyrin dimers

of sulfuric acid, vulcanization of rubber, and fertilizers. Despite its

Fumito Tania, Hirofumi Nobukunib, Takuya Kamimuraa,c

importance, sulfur has been regarded as an abundant resource

a

due to the fact that its use is limited to being an inexpensive

Institute for Materials Chemistry and Engineering, Kyushu University,

Japan b

Graduate School of Science, Osaka University, Japan

c

Graduate School of Science, Kyushu University, Japan

reagent. Here we report the synthesis of one-dimensional crystals of sulfur using the quasi one-dimensional channels of carbon nanotubes. This one-dimensional phase is confirmed by high resolution transmission electron microscopy and X-ray diffraction, revealing monatomic zigzag and linear sulfur chains inside the constrained volume of the carbon nanotubes. In addition, X-ray

We have studied the supramolecular structures and photo-

diffraction exhibits asymmetric Bragg peaks, indicating the for-

electronic properties of inclusion complexes of cyclic porphyrin

mation of one-dimensional sulfur “crystals”. Most importantly,

doi:10.1016/S0008-6223(13)01148-2