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    Gold–Silver Bimetallic Alloy Nanoparticles in a Covalent Organic Framework for Real-Time Monitoring of Hydrogen Peroxide from Live Cells

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    Embargo End Date:
    2023-04-18
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    Type
    Article
    Authors
    Arul, Ponnusamy cc
    Huang, Sheng Tung cc
    Mani, Veerappan cc
    Huang, Chih-Hung
    KAUST Department
    Sensors Lab, Advanced Membranes & Porous Materials Center (AMPMC), Computer Electrical Mathematical Science and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Advanced Membranes and Porous Materials Research Center
    Date
    2022-04-18
    Embargo End Date
    2023-04-18
    Permanent link to this record
    http://hdl.handle.net/10754/676312
    
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    Abstract
    An efficient and simple way has been described to prepare gold and silver bimetallic alloy nanoparticles (Au-AgNPs) in an organic framework with a metal-free core. The growth of alloy Au-AgNPs was monitored by UV–visible spectroscopy (UV–vis) and confirmed using various spectral, microscopy, and electrochemical techniques. The field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) results revealed that the covalent organic framework (COF) had a uniform flake-like morphology, and the alloy-based Au-AgNPs had a flower-like structure. The results of X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) indicated that Au-AgNPs are metallic in nature and highly crystalline. The surface of a glassy carbon electrode (GCE) was then modified with Au-AgNPs-COF, which was subsequently employed for enzyme-free electrochemical reduction of H2O2. The electrocatalytic cyclic voltammetry performance of the different modified electrodes was in the following order: COF (−14.82 μA) < AgNPs-COF (−26.95 μA) < AuNPs-COF (−31.78 μA) < Au-AgNPs-COF (−46.15 μA). The Au-AgNPs-COF/GCE displayed an excellent electrocatalytic activity toward reduction of H2O2, over a dynamic range of 2.0 nM–1.0 mM with a limit of detection (LOD) of 0.44 nM (S/N = 3). Furthermore, the present sensor showed appreciable selectivity, stability, and reproducibility against the reduction of H2O2. Practicality was demonstrated in fetal bovine serum (FBS), cat blood serum (CBS), and living cells (RAW 264.7)
    Citation
    Arul, P., Huang, S.-T., Mani, V., & Huang, C.-H. (2022). Gold–Silver Bimetallic Alloy Nanoparticles in a Covalent Organic Framework for Real-Time Monitoring of Hydrogen Peroxide from Live Cells. ACS Applied Nano Materials. https://doi.org/10.1021/acsanm.2c00435
    Sponsors
    The authors are grateful for the financial support from the Ministry of Science and Technology, Taiwan (MOST-107-2113-M-027-006 and MOST-108-2113-M-027-001). Ponnusamy Arul would like to thank the National Taipei University of Technology for the Post-Doctoral Fellowship
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Nano Materials
    DOI
    10.1021/acsanm.2c00435
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsanm.2c00435
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsanm.2c00435
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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