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Issue 26, 2016
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Charge transfer at carbon nanotube–graphene van der Waals heterojunctions

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Abstract

Carbon nanotubes and graphene are two most widely investigated low-dimensional materials for photonic and optoelectronic devices. Combining these two materials into all-carbon hybrid nanostructures has shown enhanced properties in a range of devices, such as photodetectors and flexible electrodes. Interfacial charge transfer is the most fundamental physical process that directly impacts device design and performance, but remains a subject less well studied. Here, we complemented Raman spectroscopy with photocurrent probing, a robust way of illustrating the interfacial built-in fields, and unambiguously revealed both static and dynamic (photo-induced) charge transfer processes at the nanotube–graphene interfaces. Significantly, the effects of nanotube species, i.e. metallic as opposed to semiconducting, are for the first time compared. Of all the devices examined, the graphene sheet was found to be p-type doped with (6, 5) chirality-enriched semiconducting SWNTs (s-SWNTs), while n-type doped with highly pure (>99%) metallic SWNTs (m-SWNTs). Our results provide important design guidelines for all-carbon hybrid based devices.

Graphical abstract: Charge transfer at carbon nanotube–graphene van der Waals heterojunctions

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Publication details

The article was received on 16 May 2016, accepted on 29 May 2016 and first published on 07 Jun 2016


Article type: Communication
DOI: 10.1039/C6NR03965K
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Citation: Nanoscale, 2016,8, 12883-12886

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    Charge transfer at carbon nanotube–graphene van der Waals heterojunctions

    Y. Liu, F. Wang, Y. Liu, X. Wang, Y. Xu and R. Zhang, Nanoscale, 2016, 8, 12883
    DOI: 10.1039/C6NR03965K

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