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Controllable MXene nano-sheet/Au nanostructure architectures for the ultra-sensitive molecule Raman detection

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Abstract

Surface-enhanced Raman scattering (SERS) spectroscopy aims to augment the relatively weak molecular vibrations based on electromagnetic enhancement (EE) and chemical enhancement (CE) mechanisms, and offers a potential way for material identification, even up to the single-molecule level, under atmospheric conditions. We have subtly combined the advantages of EE and CE, and propose new MXene (Ti3C2TX) nano-sheet/Au nanostructure architectures to break through the limitations of the Raman detection with long-time stability. The MXene nanosheets with excellent biocompatibility can effectively prevent structural distortion from the interaction with the Au NSs, and can also guarantee a high enhancement effect owing to the spatially extended electromagnetic field distribution and electron injection into the molecules. The self-assembled Au nanostructures are aggregated based on the Volmer–Weber growth model, and the electromagnetic field distribution radically evolves depending on the morphologies of the resultant Au nanostructures, leading to a drastic compensation for the limited EE of the MXene nano-sheets. Consequently, the intensified Raman vibrational signals of R6G molecules lead to a high enhancement factor of 2.9 × 107, even at an ultra-low concentration of 10−10 M. Similarly, the Raman signals of the methylene blue (MB) and crystal violet (CV) molecules can also be detected at low concentrations below 10−8 M, manifesting universal applications of the MXene/Au architectures for ultra-sensitive molecular detection under atmospheric conditions.

Graphical abstract: Controllable MXene nano-sheet/Au nanostructure architectures for the ultra-sensitive molecule Raman detection

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Publication details

The article was received on 27 Sep 2019, accepted on 28 Oct 2019 and first published on 29 Oct 2019


Article type: Communication
DOI: 10.1039/C9NR08340E
Nanoscale, 2019, Advance Article

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    Controllable MXene nano-sheet/Au nanostructure architectures for the ultra-sensitive molecule Raman detection

    M. Yu, S. Liu, D. Su, S. Jiang, G. Zhang, Y. Qin and M. Li, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR08340E

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