期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 24, 页码 7225-7229出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802597
关键词
electromagnetic field enhancement; photonic crystals; spectro-electrochemistry; surface-enhanced Raman spectroscopy; TiO2 nanotubes
资金
- DFG (SALSA Excellence Initiative) [WE 5278/2-1, EXC 314 UniCat]
- European Union via the Horizon 2020 program (Marie Curie Grant) [GAN 701192VSHER]
- Spanish Ministry of Economy, Industry and Competition (MINECO) [SEV-2016-0686]
- Comunidad de Madrid [2017-T2/IND-6092]
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 Cytochromeb(5) 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 degrees 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.
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