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| Abstract Title:
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| Enhanced sensing of trivalent lanthanide ions through covalent linking of malonamides to functional nanomaterials
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| Graduate Student Presenter:
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Carmen E. Lisowski
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| Name of the Author(s) and Affiliation(s):
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Carmen E. Lisowski and James E. Hutchison, Department of Chemistry, Materials Science Institute, University of Oregon
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Significant interest in assessing water quality has emerged through sensing and detection methods that are both sensitive and selective to particular analytes, yet do not require the use of advanced instrumentation. This research reports the synthesis and characterization of functionalized gold (Au) and zinc oxide (ZnO) nanoparticles (NPs) that display selective colorimetric sensing and spectroscopic detection of lanthanide ions. The use of nanoparticles as anchors for analyte-specific molecules not only provides a surface for binding of ligands but also enables simple fabrication of sensing devices. This system takes advantage of both the inherent properties of the particles and the strong binding affinity and preferred ligand-to-metal binding ratio of malonamide ligands for lanthanide ions. Functionalization of malonamides to AuNPs allows for the size-dependant optical properties of large (>10nm) AuNPs to be utilized. The preferred 2:1 binding ratio of the malonamides enables the AuNPs to be brought into close proximity where the surface plasmons interact, and provide the basis for colorimetric sensing. Combining the properties of ZnO, malonamides and lanthanide ions allows for the fabrication of a detector capable of identifying specific ions based on spectroscopic signals. ZnO absorbs strongly, while lanthanides are known for their strong, unique line-like emission. The favorable binding interactions of malonamides for lanthanide ions enable the malonamide to serve as a linker between ZnO and the respective lanthanide ion, resulting in the unique spectroscopic detection of individual lanthanide ions.
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