title: Au dotted magnetic network nanostructure and its application for on-site monitoring femtomolar level pesticide.
abstract: A novel magnetically responsive and surface-enhanced Raman spectroscopy (SERS) active nanocomposite is designed and prepared by direct grafting of Au nanoparticles onto the surface of magnetic network nanostructure (MNN) with the help of a nontoxic and environmentally friendly reagent of inositol hexakisphosphate shortly named as IP6. The presence of IP6 as a stabilizer and a bridging agent could weave Fe3O4 nanoparticles (NPs) into magnetic network nanostructure, which is easily dotted with Au nanoparticles (Au NPs). It has been shown firstly that the huge Raman enhancement of Au-MNN is reached by an external magnetic collection. Au-MNN presenting the large surface and high detection sensitivity enables it to exhibit multifunctional applications involving sufficient adsorption of dissolved chemical species for enrichment, separation, as well as a Raman amplifier for the analysis of trace pesticide residues at femtomolar level by a portable Raman spectrometer. Therefore, such multifunctional nanocomposites can be developed as a smart and promising nanosystem that integrates SERS approach with an easy assay for concentration by an external magnet for the effective on-site assessments of agricultural and environmental safety.
authors.affiliation: The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials and Department of Chemistry, Shanghai Normal University, Shanghai, 200234, P. R. China.
authors.forename: Tianxi
authors.initials: T
authors.lastname: Yang
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Guo
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Shuyue
authors.initials: S
authors.lastname: Fu
authors.forename: Jie
authors.initials: J
authors.lastname: Yu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wen
authors.forename: Haifeng
authors.initials: H
authors.lastname: Yang
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D060328:Magnetic Phenomena; D049329:Nanostructures / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D014675:Vegetables / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D010575:Pesticides; C000499:ferric oxide; D006046:Gold
keywords: Au nanoparticles; inositol hexaphosphate; magnetic network nanostructure; portable Raman; thiram