Electrical Properties and Photoconductivity of Stacked‐Graphene Carbon Nanotubes

Lee, Eduardo J. H.; Zhi, Linjie; Burghard, Marko; Müllen, Kläus; Kern, Klaus

doi:10.1002/adma.200903462

Cited by 36 publications

(24 citation statements)

References 19 publications

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“…The observed linear behavior of P is advantageous to adjust the optoelectronic device characteristics and paves the way for its application. Similar linear enhancement of Pwith the optical power density was also observed in other RGO‐based compounds and carbon nanotubes . Photocurrent generation mechanism of our system is explained through the band diagram and presented in Figure D.When the RGO‐ZnTTBPc film is illuminated, excitons are generated via absorbing photons.…”

Section: Resultssupporting

confidence: 78%

Reduced Graphene Oxide ‐ Zinc Phthalocyanine Composites as Fascinating Material for Optoelectronic and Photocatalytic Applications

et al. 2017

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Reduced graphene oxide‐ zinc tetra tert‐butyl phthalocyanine (RGO‐ZnTTBPc) hybrid material has been synthesized through the reduction of graphene oxide (GO) in presence of ZnTTBPc. As‐prepared RGO‐ZnTTBPc thin film photodetector exhibited stable and reproducible photocurrent responses with a responsivity of 2 A/W under simulated solar light.A detailed study on electrical transport mechanism reveals the occurrence of phonon assisted quantum tunneling of charge carriers among the defect states present in RGO ‐ ZnTTBPc system. The relaxation dynamics of charge carriers in the composite is modulated by a temperature independent universal function. Furthermore, the resulting hybrid material showed an enhanced photocatalytic activity with 3.5 times higher reduction rate constant over controlled ZnTTBPc towards the reduction of 4‐nitrophenol under solar light irradiation. Superior photoresponse property and photocatalytic reduction was attributed to the synergistic effect between favorable matching of the lowest unoccupied molecular orbital (LUMO) level of ZnTTBPc to the work function of conductive RGO. The present work is especially important in the field of RGO‐based next‐generation photocatalysts and light energy harvesting applications.

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Section: Resultssupporting

confidence: 78%

Reduced Graphene Oxide ‐ Zinc Phthalocyanine Composites as Fascinating Material for Optoelectronic and Photocatalytic Applications

et al. 2017

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“…Khan et al [61] used standard four probe method for electrical transport measurements of these multi-walled carbon nanotubes (MWNTs) over the temperature range of 200-4.2 K. From these results, it is found that the variable range hopping (VRH) is responsible for the transport of carriers over the entire temperature range of 200-4.2 K. For the temperature range (200-100 K), three-dimensional VRH is suggested, while twodimensional VRH is observed for the temperature range (100-4.2 K). Lee et al [62] obtained the stacked-graphene carbon nanotubes (SG-CNTs) via pyrolysis of columnar superstructures of polycyclic aromatic hydrocarbons. These SG-CNTs are studied by electrical transport measurements and scanning photocurrent microscopy.…”

Section: Variable Range Hopping In Carbon Nanotubesmentioning

confidence: 99%

Variable Range Hopping in Carbon Nanotubes

Khan¹,

Husain

2010

CNANO

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Carbon nanotubes exhibit exceptional properties that are a consequence of their symmetric structure. Many properties of carbon nanotubes (CNTs) have been explained in the wider context of materials science, thereby highlighting the contribution from different researchers worldwide in this rapidly expanding field. Among various other properties of CNTs studied so far, the electrical transport properties are still unclear and needs a lot of attention. Due to high anisotropy of graphite, the electrical properties are strongly dependent on the structure of the nanotubes. Since, the CNTs can be metallic and semi-conducting in nature, their explanation to electrical conduction mechanism in these two cases would be different. During the last few years, efforts have been made to understand the electrical transport phenomenon in CNTs, aiming at the design of nanoelectronic devices made solely of carbon. Keeping in view the above, it is of great interest to present a state of art on the progress involving the research work on electrical conduction mechanism especially variable range hopping in CNTs. In the present paper, we have presented a review on electrical transport mechanism especially variable range hopping in carbon nanotubes. This review will provide a better understanding of variable range hopping in CNTs.

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“…The motivation for depositing graphene onto the ITO surface relies on its utilization as an acceptor material in the active layer of bulk heterojunction polymeric solar cells 16–18 or as part of a composite material based on a hole‐trapping conducting polymer used for the anode realization of polymeric solar cells 19. The motivation for interfacing nanostructured carbon materials that possess highly specific and widely variable functions to develop a process that is compatible with a variety of materials and device designs was recently under investigation for potential applications 20. Kern and coworkers 20 reported the electrical transport properties of graphene‐carbon nanotubes, as well as their electrical response under illumination, in order to evaluate their use in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

“…The motivation for interfacing nanostructured carbon materials that possess highly specific and widely variable functions to develop a process that is compatible with a variety of materials and device designs was recently under investigation for potential applications 20. Kern and coworkers 20 reported the electrical transport properties of graphene‐carbon nanotubes, as well as their electrical response under illumination, in order to evaluate their use in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of transparent and conducting graphene/carbon nanotube thin films

Bon

Valentini

Kenny

et al. 2010

Physica Status Solidi (a)

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We report the electrophoretic deposition of graphene/singlewalled carbon nanotube hybrid films onto flexible, transparent and conducting indium tin-oxide-coated polyethylene terephthalate substrates. This room-temperature solution process is completely compatible with polymeric substrates and does not require a sophisticated transfer process, allowing uniform and controllable deposition of such carbon thin films with tailored optical and electrical properties over large areas. In particular, the film thickness, optical transparency and electrical conductivity can be modified by the deposition time and the obtained films span several square centimetres in area.

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Electrical Properties and Photoconductivity of Stacked‐Graphene Carbon Nanotubes

Cited by 36 publications

References 19 publications

Reduced Graphene Oxide ‐ Zinc Phthalocyanine Composites as Fascinating Material for Optoelectronic and Photocatalytic Applications

Reduced Graphene Oxide ‐ Zinc Phthalocyanine Composites as Fascinating Material for Optoelectronic and Photocatalytic Applications

Variable Range Hopping in Carbon Nanotubes

Electrodeposition of transparent and conducting graphene/carbon nanotube thin films

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