Fabrication of Au decorated MoS2 Langmuir Blodgett film as SERS sensing scaffold for detection of thiram in aqueous solution and in carrot peels

• Published in: Materials letters 2024-10, Vol.372, p.137033, Article 137033
• Main Authors: Kumar Mitra, Chayan, Devi Sharma, Mamta, Ghosh, Manash, Pande, Surojit, Chowdhury, Joydeep
• Format: Article
• Language: English
• Subjects: Nanoparticles; Optical materials and properties; Raman; Sensors; Spectroscopy; Thin films
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2024.137033

[Display omitted] •Fabricating robust and reproducible SERS active Gold decorated MoS2 substrate.•Efficacy in detecting molecules at ultralow concentrations of 4-Mpy.•Detection of thiram in aqueous solution and carrot peels at trace concentrations.•Cost effective SERS active scaffold with long shelf life yet easy to fabricate. This paper is focused on simple fabrication of robust and reproducible SERS active substrate through self-assembly of gold nanoparticles (AuNps) entrapped in the Langmuir Blodgett (LB) film of MoS2 flakes. The as prepared Au-MoS2 substrate can detect SERS signals of 4-Mercapto Pyridine (4-Mpy) molecules at trace concentrations down to 10-12 M. The substrate has been further employed in detecting thiram (TH) both in aqueous solution and in carrot peels (CPls). The limit of detection (LOD) of TH in aqueous medium and in CPls have been estimated to be ∼ 5.18 and 10.16 pM respectively. We believe that the applicability of this SERS active substrate may be extended in the trace detections of explosives, drugs and in diagnostic applications.