期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 42, 页码 47774-47783出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11231
关键词
MoTe2; SERS; sensing; chemical enhancement; beta-sitosterol
资金
- Tomsk Polytechnic University Competitiveness Enhancement Program [VIU-RSCABS-194/2020]
- RFBR [19-43-703002]
- Grant Agency of Czech Republic [ACR 19-24603Y]
- University of Glasgow
- EPSRC [EP/P001653/1, EP/N509668/1]
- Carnegie Trust [RIG007428]
- EPSRC [EP/P001653/1] Funding Source: UKRI
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 beta-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 approximate to 10(4), 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, beta-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.
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