Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants

Mills, Anna M.; Strzalka, Joseph; Bernat, Andrea; Rao, Qinchun; Hallinan, Jr., Daniel T.

doi:10.3390/nano12081253

Title: Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants

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Abstract

Magnetic-core/gold-shell nanoparticles (MAuNPs) are of interest for enabling rapid and portable detection of trace adulterants in complex media. Gold coating provides biocompatibility and facile functionalization, and a magnetic core affords analyte concentration and controlled deposition onto substrates for surface-enhanced Raman spectroscopy. Iron oxide cores were synthesized and coated with gold by reduction of HAuCl₄ by NH₂OH. MAuNPs were grafted with polyethylene glycol (PEG) and/or functionalized with 4-mercaptobenzoic acid (4-MBA) and examined using a variety of microscopic, spectroscopic, magnetometric, and scattering techniques. For MAuNPs grafted with both PEG and 4-MBA, the order in which they were grafted impacted not only the graft density of the individual ligands, but also the overall graft density. Significant Raman signal enhancement of the model analyte, 4-MBA, was observed. This enhancement demonstrates the functionality of MAuNPs in direct detection of trace contaminants. The magnetic deposition rate of MAuNPs in chloroform and water was explored. The presence of 4-MBA slowed the mass deposition rate, and it was postulated that the rate disparity originated from differing NP-substrate surface interactions. These findings emphasize the importance of ligand choice in reference to the medium, target analyte, and substrate material, as well as functionalization procedure in the design of similar sensingmore » platforms.« less

Authors:

;

; Bernat, Andrea;

;

Publication Date:: Thu Apr 07 00:00:00 EDT 2022

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Org.:: National Science Foundation (NSF); State of Florida; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDA National Institute of Food and Agriculture (NIFA)

OSTI Identifier:: 1862087

Alternate Identifier(s):: OSTI ID: 1901707

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Published Article

Journal Name:: Nanomaterials

Additional Journal Information:: Journal Name: Nanomaterials Journal Volume: 12 Journal Issue: 8; Journal ID: ISSN 2079-4991

Publisher:: MDPI AG

Country of Publication:: Switzerland

Language:: English

Subject:: 36 MATERIALS SCIENCE; food contamination; grafted nanoparticles; hydrophobic; Raman; SERS; core-shell nanoparticles

Citation Formats


                    Mills, Anna M., Strzalka, Joseph, Bernat, Andrea, Rao, Qinchun, and Hallinan, Jr., Daniel T. Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants.  Switzerland: N. p., 2022. 
Web.  doi:10.3390/nano12081253.

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                    Mills, Anna M., Strzalka, Joseph, Bernat, Andrea, Rao, Qinchun, & Hallinan, Jr., Daniel T. Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants.  Switzerland.  https://doi.org/10.3390/nano12081253

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                    Mills, Anna M., Strzalka, Joseph, Bernat, Andrea, Rao, Qinchun, and Hallinan, Jr., Daniel T. Thu .  
"Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants".  Switzerland.  https://doi.org/10.3390/nano12081253.

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@article{osti_1862087,

  title        = {Magnetic-Core/Gold-Shell Nanoparticles for the Detection of Hydrophobic Chemical Contaminants},

  author       = {Mills, Anna M. and Strzalka, Joseph and Bernat, Andrea and Rao, Qinchun and Hallinan, Jr., Daniel T.},

  abstractNote = {Magnetic-core/gold-shell nanoparticles (MAuNPs) are of interest for enabling rapid and portable detection of trace adulterants in complex media. Gold coating provides biocompatibility and facile functionalization, and a magnetic core affords analyte concentration and controlled deposition onto substrates for surface-enhanced Raman spectroscopy. Iron oxide cores were synthesized and coated with gold by reduction of HAuCl4 by NH2OH. MAuNPs were grafted with polyethylene glycol (PEG) and/or functionalized with 4-mercaptobenzoic acid (4-MBA) and examined using a variety of microscopic, spectroscopic, magnetometric, and scattering techniques. For MAuNPs grafted with both PEG and 4-MBA, the order in which they were grafted impacted not only the graft density of the individual ligands, but also the overall graft density. Significant Raman signal enhancement of the model analyte, 4-MBA, was observed. This enhancement demonstrates the functionality of MAuNPs in direct detection of trace contaminants. The magnetic deposition rate of MAuNPs in chloroform and water was explored. The presence of 4-MBA slowed the mass deposition rate, and it was postulated that the rate disparity originated from differing NP-substrate surface interactions. These findings emphasize the importance of ligand choice in reference to the medium, target analyte, and substrate material, as well as functionalization procedure in the design of similar sensing platforms.},

  doi          = {10.3390/nano12081253},

  journal      = {Nanomaterials},

  number       = 8,

  volume       = 12,

  place        = {Switzerland},

  year         = {Thu Apr 07 00:00:00 EDT 2022},

  month        = {Thu Apr 07 00:00:00 EDT 2022}

}

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