Possible One-Dimensional Helical Conductor: Hexa-<i>peri</i>-hexabenzocoronene Nanotube

Hara, Toshifumi; Furukawa, Ko; Nakamura, Toshikazu; Yamamoto, Yohei; Kosaka, Atsuko; Jin, Wusong; Fukushima, Takanori; Aida, Takuzo

doi:10.1143/jpsj.77.034710

Cited by 12 publications

(14 citation statements)

References 16 publications

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“…Intersystem crossing in 3 ZnP* (k 1 in Figs 5 and 7) accelerates because of the heavy atom effect of the AgNPs. The magnitude of the MFE increases in the presence of AgNPs because of photoinduced intramolecular electron-transfer from 3 ZnP* to V 2+ (k 2 in Figs 5 and 7) and this may be enhanced by LSPR in the AgNPs.…”

Section: Mfes On the Photocurrents Of The Znp(6)v-agnp Composite Filmmentioning

confidence: 99%

“…Using covalently bonded D-A systems, a number of modified electrodes have been designed for use as photosensitive electrodes [2]. Well-defined self-assembled coaxial nanowires consisting of D-A linked compounds are expected to become next generation photofunctional nanodevices [3,4]. However, the reaction mechanism of the photoelectrochemical process of modified electrodes or self-assembled nanostructures has not yet been determined.…”

Section: Introductionmentioning

confidence: 99%

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Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Yonemura

Niimi

Yamada

2015

J. Porphyrins Phthalocyanines

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Zinc-porphyrin(ZnP)-viologen(V 2+ ) linked compound containing six methylene group (ZnP(6)V)-silver nanoparticle (AgNP) composite films was fabricated by combining electrostatic layerby-layer adsorption and the Langmuir-Blodgett method. The incident photo to photocurrent efficiency (IPCE) values of the ZnP(6)V-AgNP composite films are higher than those of the ZnP(6)V films and much higher than those of ZnP derivative films without V 2+ moiety as a reference. The large increase in the IPCE values of the ZnP(6)V-AgNP composite films likely comes from a combination of localized surface plasmon resonance (LSPR) from AgNPs and photoinduced intramolecular electron-transfer upon linking to a V 2+ moiety. The photocurrents of the ZnP(6)V-AgNP composite films and the ZnP(6)V films increase upon application of a magnetic field. Magnetic field effects (MFEs) were clearly observed for both ZnP(6)V-AgNP composite films and the ZnP(6)V films. Photocurrents increase with magnetic field under low magnetic fields (B ≤ 150-300 mT) and are constant under high magnetic fields (B > 150-300 mT). MFEs can be explained by a radical pair mechanism. The magnitude of the MFEs in the ZnP(6)VAgNP composite films is higher than that in the ZnP(6)V films. A remarkable increase in photocurrent for the ZnP(6)V-AgNP composite films was observed because of LSPR from the AgNPs in the presence of a magnetic field when compared with the ZnP(6)V films in the absence of a magnetic field. KEYWORDS: photocurrent, magnetic field effect, silver nanoparticle, localized surface plasmon resonance, photoinduced intramolecular electron-transfer, radical pair mechanism.

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Section: Mfes On the Photocurrents Of The Znp(6)v-agnp Composite Filmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Yonemura

Niimi

Yamada

2015

J. Porphyrins Phthalocyanines

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“…Whereas the intact nanotube is an insulator, after oxidation with NOBF 4 , it shows an ohmic I -V profile. The conductivity decreases upon cooling, indicating that the oxidized nanotube is a semiconductor with a resistance of 2.5 M at 285 K. The nanotubes show a clearly anisotropic conduction [16], where the resistivities at 298 K of the oriented macroscopic fiber of 3b along (ρ ) and across (ρ ⊥ ) the fiber axis are 20 and 140 cm, respectively, and the ratio ρ ⊥ /ρ increases from 7 to 35 upon cooling from 298 to 55 K. The anisotropy of charge transport is confirmed by flash-photolysis time-resolved microwave conductivity (FP-TRMC) [16] and electron spin resonance (ESR) measurements [17].…”

Section: Hexabenzocoronenesmentioning

confidence: 83%

Programmed self-assembly of largeπ-conjugated molecules into electroactive one-dimensional nanostructures

Yamamoto

2012

Science and Technology of Advanced Materials

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Electroactive one-dimensional (1D) nano-objects possess inherent unidirectional charge and energy transport capabilities along with anisotropic absorption and emission of light, which are of great advantage for the development of nanometer-scale electronics and optoelectronics. In particular, molecular nanowires formed by self-assembly of π-conjugated molecules attract increasing attention for application in supramolecular electronics. This review introduces recent topics related to electroactive molecular nanowires. The nanowires are classified into four categories with respect to the electronic states of the constituent molecules: electron donors, acceptors, donor-acceptor pairs and miscellaneous molecules that display interesting electronic properties. Although many challenges still remain for practical use, state-of-the-art 1D supramolecular nanomaterials have already brought significant advances to both fundamental chemical sciences and technological applications.

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“…1 (2011)g-value and linewidth (¦H pp ) exhibit angular dependencies on the direction of the magnetic field, clearly indicating that the motion of the charge carriers in the nanotubes is anisotropic. 13 The anisotropic conduction was further confirmed by flash photolysis time-resolved microwave conductivity (FP-TRMC) measurements.…”

Section: Award Accountsmentioning

confidence: 84%

Electroactive Nanotubes from π-Conjugated Discotic Molecules

Yamamoto¹

2010

Bulletin of the Chemical Society of Japan

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Self-assembly of ³-conjugated molecules is attractive for construction of well-defined, nanometer-scale electroactive materials. This account describes our developments on self-assembled nanotubes from Gemini-shaped hexa-peri-hexabenzocoronenes (HBCs). At first, detailed molecular arrangement in the nanotube is presented, which is perfectly revealed by a synchrotron radiation X-ray diffraction analysis of a macroscopic fiber consisting of highly aligned HBC nanotubes. Next, electroconductive properties of the HBC nanotubes are investigated. By means of direct current and noncontact methods, anisotropic charge-transport properties in the nanotubes are confirmed. The effect of the surface oligoether chains on intertubular conduction is also examined by field-effect transistor measurements. Finally, optoelectronic applications are developed by constructing newly designed nanotubes. These nanotubes possess a coaxial configuration, where an electron-donating graphitic bilayer of ³-stacked HBC arrays is laminated by an electronaccepting molecular layer. Due to the molecular-layer donor/acceptor heterojunction, the nanotubes exhibit remarkable photoconduction and photovoltaic outputs. Furthermore, the optoelectronic properties are modulated by changing the density of electron acceptors on the nanotube surfaces by coassembly of multiple components or utilizing photochromism. These results will advance to electronic and optoelectronic applications of supramolecular nanomaterials.

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Possible One-Dimensional Helical Conductor: Hexa-peri-hexabenzocoronene Nanotube

Cited by 12 publications

References 16 publications

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Programmed self-assembly of largeπ-conjugated molecules into electroactive one-dimensional nanostructures

Electroactive Nanotubes from π-Conjugated Discotic Molecules

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