Plasmon-Enhanced Photocatalysis on Anisotropic Gold Nanorod Arrays

Authors

  • Levent Kubus,

    1. Bio-Inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara (Turkey), Fax: (+90) 312-2122279
    2. Department of Chemical Engineering, Hacettepe University, 06532 Ankara (Turkey)
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  • Hakan Erdogan,

    1. Bio-Inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara (Turkey), Fax: (+90) 312-2122279
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  • Dr. S. Sebnem Cetin,

    1. Photonic Research Laboratory, Department of Physics, Gazi University, 06500 Ankara (Turkey)
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  • Prof. Dr. Erhan Biskin,

    1. Department of Chemical Engineering, Hacettepe University, 06532 Ankara (Turkey)
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  • Prof. Dr. Gokhan Demirel

    Corresponding author
    1. Bio-Inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara (Turkey), Fax: (+90) 312-2122279
    • Bio-Inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara (Turkey), Fax: (+90) 312-2122279
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Abstract

The field of photocatalysis is an active area owing to the possible contributions to solve some challenging problems such as sustainable energy production, environmental pollution control, and even global warming. Unfortunately, traditional photocatalysts, especially semiconductors, suffer from inherent deficiencies, which include high activation barriers, the low mobility of charge carriers, and poor long-term stabilities. Herein, we demonstrate a plasmonic photocatalyst based on unidirectional gold nanorod arrays fabricated by using the oblique-angle deposition (OAD) technique. The fabricated gold nanorod arrays exhibit a remarkable plasmonic anisotropy, which depends on the direction of the incoming light. By employing these arrays as a plasmonic catalyst, a clear improvement and control in the catalytic reduction of o-nitroaniline to 1,2-benzenediamine, depending on the directionalities and anisotropic plasmonic properties of the gold nanorods, was obtained. These results suggest that such unique characteristics of directional gold nanorod arrays could greatly impact several technological areas, not only in plasmon-enhanced photocatalysis but in biosensing and optofluidic applications.

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