Fabrication of versatile fe3o4/go/au composite nanomaterial as sers-active substrate for detection of pesticide residue




HIGHLIGHTS
  • What: In the study, a three-layer of multifunctional Fe3O4/GO/Au composite nanomaterial with high hot spot was designed and prepared as a reinforced matrix.
  • Who: Mancozeb et al. from the Shaanxi University of Technology https://orcidorg/0000-0002-0195, have published the research work: Fabrication of Versatile Fe3O4/GO/Au Composite Nanomaterial as SERS-active Substrate for Detection of Pesticide Residue, in the Journal: (JOURNAL)
SUMMARY

    Compared with ordinary metal NPs, magnetic nanoparticles (MNPs) can achieve rapid and efficient separation and enrichment by applying an external magnetic_field after adsorbing the target material (Zheg et_al 2021). To achieve rapid and sensitive detection of pesticide residues in food, the project designed and constructed a three-layer of multi-functional SERS composite substrate, Fe3O4/GO/Au, as depicted in Scheme 1. Based on the excellent properties of Fe3O4/GO/Au above, mancozeb in aqueous solution was directly detected. Compared with the synthesized composite nanomaterial Fe3O4/GO/Au, the absorption peak of Fe3O4/GO/Au shows a slight red shift. To better analyse the composite of GO and Au NPs, the authors put the Raman spectra peak of GO and Fe3O4/GO/Au together for comparison, as shown in Fig 4. High signal-to-noise ratio SERS spectra of R6G were obtained with Fe3O4/GO/Au nanocomposite material as substrate. The above results demonstrate that Fe3O4/GO/Au composite materials enhance the SERS activity of metals. The prepared Fe3O4/GO/Au composite material can serve as a SERS active substrate for rapid detection. The obtained Fe3O4/GO/Au composite material was used as SERS active substrate, and Raman spectra of different concentrations of mancozeb in pyridine solution were collected, and the spectra of pyridine were given as control. In the study, a three-layer of multifunctional Fe3O4/GO/Au composite nanomaterial with high hot spot was designed and prepared as a reinforced matrix. The Fe3O4/GO/Au and Au NPs was experimentally investigated using R6G as the probing molecule.The results demonstrated that the prepared composite nanomaterials exhibited excellent performance than single Au NPs for SERS assay. The Fe3O4/GO/Au composite was successfully applied to detect mancozeb, showing linear correlations ranging from 0.25 to 25 ppm at 1320 cm- 1. @@

LAY DEFINITIONS
  • Ethylene thiourea: A degradation product of ethylenebis(dithiocarbamate) fungicides. It has been found to be carcinogenic and to cause THYROID hyperplasia
  • Substrate: A wafer (slice or substrate) is a thin slice of semiconductor material, such as a crystalline silicon, used in electronics for the fabrication of integrated circuits and in photovoltaics for conventional, wafer-based solar cells. The wafer serves as the substrate for microelectronic devices built in and over the wafer and undergoes many microfabrication process steps such as doping or ion implantation, etching, deposition of various materials, and photolithographic patterning
  • Pesticide: Chemicals used to destroy pests of any sort. The concept includes fungicides (FUNGICIDES, INDUSTRIAL); INSECTICIDES; RODENTICIDES; etc
  • Transmission electron microscopy: Electron microscopy in which the ELECTRONS or their reaction products that pass down through the specimen are imaged below the plane of the specimen.
  • Graphene oxide: Graphite oxide (GO), formerly called graphitic oxide or graphitic acid, is a compound of carbon, oxygen, and hydrogen in variable ratios, obtained by treating graphite with strong oxidizers and acids for resolving of extra metals. The maximally oxidized bulk product is a yellow solid with C:O ratio between 2.1 and 2.9, that retains the layer structure of graphite but with a much larger and irregular spacing.The bulk material spontaneously disperses in basic solutions or can be dispersed by sonication in polar solvents to yield monomolecular sheets, known as graphene oxide by analogy to graphene, the single-layer form of graphite
  • Nanomaterial: Materials which have structured components with at least one dimension in the range of 1 to 100 nanometers. These include NANOCOMPOSITES; NANOPARTICLES; NANOTUBES; and NANOWIRES
  • X-ray diffraction: X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal

Licence: cc-by

Site reference: https://www.researchsquare.com/article/rs-3921869/latest.pdf

DOI reference: https://www.doi.org/10.1007/s11356-024-34191-z

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