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Issue 31, 2017
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Photocurrent spectroscopy of dye-sensitized carbon nanotubes

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Abstract

Monochiral (7,5) single walled carbon nanotubes (SWCNTs) are integrated into a field effect transistor device in which the built-in electric field at the nanotube/metal contact allows for exciton separation under illumination. Variable wavelength spectroscopy and 2D surface mapping of devices consisting of 10–20 nanotubes are performed in the visible region and a strong correlation between the nanotube's second optical transition (S22) and the photocurrent is found. After integration, the SWCNTs are non-covalently modified with three different fluorescent dye molecules with off-resonant absorption maxima at 532 nm, 565 nm, and 610 nm. The dyes extend the absorption properties of the nanotube and contribute to the photocurrent. This approach holds promise for the development of photo-detectors and for applications in photovoltaics and biosensing.

Graphical abstract: Photocurrent spectroscopy of dye-sensitized carbon nanotubes

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Publication details

The article was received on 06 Jun 2017, accepted on 18 Jul 2017 and first published on 20 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR04022A
Citation: Nanoscale, 2017,9, 11205-11213
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    Photocurrent spectroscopy of dye-sensitized carbon nanotubes

    A. Alam, S. Dehm, F. Hennrich, Y. Zakharko, A. Graf, M. Pfohl, I. M. Hossain, M. M. Kappes, J. Zaumseil, R. Krupke and B. S. Flavel, Nanoscale, 2017, 9, 11205
    DOI: 10.1039/C7NR04022A

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