CUED Publications database

Photoconductive hybrid films via directional self-assembly of C 60 on aligned carbon nanotubes

Meshot, ER and Patel, KD and Tawfick, S and Juggernauth, KA and Bedewy, M and Verploegen, EA and De Volder, MFL and Hart, AJ (2012) Photoconductive hybrid films via directional self-assembly of C 60 on aligned carbon nanotubes. Advanced Functional Materials, 22. pp. 577-584. ISSN 1616-301X

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Abstract

Hybrid nanostructured materials can exhibit different properties than their constituent components, and can enable decoupled engineering of energy conversion and transport functions. Novel means of building hybrid assemblies of crystalline C 60 and carbon nanotubes (CNTs) are presented, wherein aligned CNT films direct the crystallization and orientation of C 60 rods from solution. In these hybrid films, the C 60 rods are oriented parallel to the direction of the CNTs throughout the thickness of the film. High-resolution imaging shows that the crystals incorporate CNTs during growth, yet grazing-incidence X-ray diffraction (GIXD) shows that the crystal structure of the C 60 rods is not perturbed by the CNTs. Growth kinetics of the C 60 rods are enhanced 8-fold on CNTs compared to bare Si, emphasizing the importance of the aligned, porous morphology of the CNT films as well as the selective surface interactions between C 60 and CNTs. Finally, it is shown how hybrid C 60-CNT films can be integrated electrically and employed as UV detectors with a high photoconductive gain and a responsivity of 10 5 A W -1 at low biases (± 0.5 V). The finding that CNTs can induce rapid, directional crystallization of molecules from solution may have broader implications to the science and applications of crystal growth, such as for inorganic nanocrystals, proteins, and synthetic polymers. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Item Type: Article
Uncontrolled Keywords: carbon nanotubes fullerenes hybrid materials photoconductivity self-assembly
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:42
Last Modified: 08 Dec 2014 02:22
DOI: 10.1002/adfm.201102393