High-performance SERS detection of pesticides using BiOCl-BiOBr@Pt/Au hybrid nanostructures on styrofoams as 3D functional substrate
Wabaidur, Ramachandran Balaji & Renganathan Vengudusamy & Shen-Ming Chen & Tse-Wei Chen & Xiaoheng Liu & Mohammad Rizwan Khan & Zeid A. ALOthman & Mohammad Ajmal Ali & Saikh Mohammad . 2020
A 3D flexible domestic waste styrofoam is reported as a surface enhanced Raman scattering (SERS) substrate loaded with
BiOCl-BiOBr@Pt/Au semiconductor-plasmonic composites. The hydrothermally prepared BiOCl-BiOBr nanocomposite is
thoroughly characterized for its crystal structure using X-Ray diffraction, morphology through scanning electron microscopy,
and electronic states of the elements using X-ray photoelectron spectroscopy. The alpha cypermethrin (ACM) is chosen as a model pesticide analyte for SERS investigation. The BiOCl-BiOBr@Pt/Au loaded foam substrate exhibited a high enhancement factor (106) and low limit of detection (10−10 M) upon SERS investigation. The unique architecture of the semiconductorplasmonic composite enables an efficient charge transfer capability and plasmonic hotspots which aids in the enhancement of target analytes. In order to better demonstrate the versatility towards other pesticides, SERS detection of glyphosate and paraquat pesticides are also performed using the fabricated SERS substrate. The stability of the substrate has been investigated in detail for 30 days and the substrate was highly stable. The BiOCl-BiOBr@Pt/Au-based foam substrate also performed well in rapid realtime sensing of alpha cypermethrin on the kiwi fruit exocarp at lower level concentrations.
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