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Issue 19, 2020
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Biomolecular sensing by surface-enhanced Raman scattering of monolayer Janus transition metal dichalcogenide

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Abstract

In this work, we demonstrate that monolayer Janus MoSSe is an effective and universal platform for enhancing Raman signal and detecting biomolecules for the first time. The out-of-plane dipoles in monolayer Janus MoSSe redistribute charges of adsorbed biomolecules, polarize biomolecules and enhance their Raman vibrational intensity. The estimated Raman enhancement factor is higher than 105, which is comparable with the highest reported enhancement factor for 2D substrates. The C–C stretching Raman peak around 1360 cm−1 is used to indicate the glucose concentration, and its peak-integrated intensity increases linearly with the glucose concentration in the range of 1–10 mM. DFT calculations also confirm that charge redistribution in glucose induced by dipole interactions can enhance Raman intensity significantly when glucose molecules are adsorbed onto monolayer Janus MoSSe.

Graphical abstract: Biomolecular sensing by surface-enhanced Raman scattering of monolayer Janus transition metal dichalcogenide

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Article information


Submitted
10 Jan 2020
Accepted
16 Apr 2020
First published
16 Apr 2020

Nanoscale, 2020,12, 10723-10729
Article type
Paper

Biomolecular sensing by surface-enhanced Raman scattering of monolayer Janus transition metal dichalcogenide

S. Jia, A. Bandyopadhyay, H. Kumar, J. Zhang, W. Wang, T. Zhai, V. B. Shenoy and J. Lou, Nanoscale, 2020, 12, 10723
DOI: 10.1039/D0NR00300J

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