Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

James P. Fraser, Pavel Postnikov, Elena Miliutina, Zdenka Kolska, Rashid Valiev, Vaclav Švorčík, Oleksiy Lyutakov, Alexey Y. Ganin, Olga Guselnikova

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional (2D) transition-metal dichalcogenides have become promising candidates for surface-enhanced Raman spectroscopy (SERS), but currently very few examples of detection of relevant molecules are available. Herein, we show the detection of the lipophilic disease marker β-sitosterol on few-layered MoTe2 films. The chemical vapor deposition (CVD)-grown films are capable of nanomolar detection, exceeding the performance of alternative noble-metal surfaces. We confirm that the enhancement occurs through the chemical enhancement (CE) mechanism via formation of a surface-analyte complex, which leads to an enhancement factor of ≈104, as confirmed by Fourier transform infrared (FTIR), UV-vis, and cyclic voltammetry (CV) analyses and density functional theory (DFT) calculations. Low values of signal deviation over a seven-layered MoTe2 film confirms the homogeneity and reproducibility of the results in comparison to noble-metal substrate analogues. Furthermore, β-sitosterol detection within cell culture media, a minimal loss of signal over 50 days, and the opportunity for sensor regeneration suggest that MoTe2 can become a promising new SERS platform for biosensing.

Original languageEnglish
Pages (from-to)47774-47783
Number of pages10
JournalACS applied materials & interfaces
Volume12
Issue number42
DOIs
Publication statusPublished - 21 Oct 2020

Keywords

  • chemical enhancement
  • MoTe2
  • sensing
  • SERS
  • β-sitosterol

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules'. Together they form a unique fingerprint.

Cite this