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Issue 45, 2019
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Remarkable surface-enhanced Raman scattering on self-assembled {201} anatase

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Semiconductors exhibit great potential as a surface-enhanced Raman scattering (SERS) substrate due to their low cost, stability, and biocompatibility. However, their application has been essentially restricted by their intrinsically low SERS sensitivity (10–102). Herein, sea urchin-like TiO2 was obtained by a self-assembled growth of crystals enclosed with the {201} facet. The high-symmetric spiny spheres exhibited appreciable Raman enhancement factors (EFs) of 1.6 × 106, three orders of magnitude higher than those asymmetric TiO2 with exposed {101}, {001}, and {100} facets. The greatest charge transfer upon dopamine adsorption occurred on {201} TiO2 due to its high density of unoccupied t2g orbitals, partly contributing to the excellent SERS performance. More importantly, the sea urchin-like spheres created high-density hotspots evenly distributed in the vicinity of sharp tips and at narrow gaps between the spines, enabling a strong electromagnetic field enhancement (1.4 × 104). Benefiting from the specific electronic and morphologic properties, the self-assembled {201} TiO2 exhibited superior SERS performance in terms of both intensity and reproducibility. The insights gained from this study open a new avenue to improve the SERS performance of semiconductors for applications in biomedical analysis, food detection, and toxicity tests.

Graphical abstract: Remarkable surface-enhanced Raman scattering on self-assembled {201} anatase

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The article was received on 13 Sep 2019, accepted on 19 Oct 2019 and first published on 22 Oct 2019

Article type: Paper
DOI: 10.1039/C9TC05062K
J. Mater. Chem. C, 2019,7, 14239-14244

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    Remarkable surface-enhanced Raman scattering on self-assembled {201} anatase

    Y. Yu, J. Du and C. Jing, J. Mater. Chem. C, 2019, 7, 14239
    DOI: 10.1039/C9TC05062K

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