High Electromagnetic Field Enhancement of TiO2 Nanotube Electrodes

Oener IH, Querebillo CJ, David C, Gernert U, Walter C, Driess M, Leimkuehler S, Ly KH, Weidinger IM (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Angewandte Chemie International Edition Wiley

Book Volume: 57

Pages Range: 7225-7229

Journal Issue: 24

DOI: 10.1002/anie.201802597

Abstract

We present the fabrication of TiO2 nanotube electrodes with high biocompatibility and extraordinary spectroscopic properties. Intense surface-enhanced resonance Raman signals of the heme unit of the redox enzyme Cytochrome b5 were observed upon covalent immobilization of the protein matrix on the TiO2 surface, revealing overall preserved structural integrity and redox behavior. The enhancement factor could be rationally controlled by varying the electrode annealing temperature, reaching a record maximum value of over 70 at 475 °C. For the first time, such high values are reported for non-directly surface-interacting probes, for which the involvement of charge-transfer processes in signal amplification can be excluded. The origin of the surface enhancement is exclusively attributed to enhanced localized electric fields resulting from the specific optical properties of the nanotubular geometry of the electrode.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Technische Universität Berlin DE Germany (DE) IMDEA-Nanociencia ES Spain (ES) Universität Potsdam DE Germany (DE) University of Cambridge GB United Kingdom (GB)

How to cite

APA:

Oener, I.H., Querebillo, C.J., David, C., Gernert, U., Walter, C., Driess, M.,... Weidinger, I.M. (2018). High Electromagnetic Field Enhancement of TiO2 Nanotube Electrodes. Angewandte Chemie International Edition, 57(24), 7225-7229. https://doi.org/10.1002/anie.201802597

MLA:

Oener, Ibrahim Halil, et al. "High Electromagnetic Field Enhancement of TiO2 Nanotube Electrodes." Angewandte Chemie International Edition 57.24 (2018): 7225-7229.

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