title: Fabrication of Highly Sensitive and Stable Hydroxylamine Electrochemical Sensor Based on Gold Nanoparticles and Metal-Metalloporphyrin Framework Modified Electrode.
abstract: This paper describes the immobilization of gold nanoparticles on metal-metalloporphyrin frameworks (AuNPs/MMPF-6(Fe)) through electrostatic adsorption. The composites were characterized by powder X-ray diffraction, zeta potential, transmission electron microscopy, electrochemical impedance spectroscopy, and voltammetric methods. MMPF-6(Fe) exhibited a pair of redox peaks of the Fe(III)TCPP/Fe(II)TCPP redox couple. The AuNPs/MMPF-6(Fe)-based electrochemical sensor demonstrates a distinctly higher electrocatalytic response to the oxidation of hydroxylamine due to the synergic effect of the gold metal nanoparticles and metal-metalloporphyrin matrix. The voltammetric current response exhibits two linear dynamic ranges, 0.01-1.0 and 1.0-20.0 μmol L(-1), and the detection limit was as low as 0.004 μmol L(-1) (S/N = 3). Moreover, the biosensor exhibits high reproducibility and stability in acid solution. Our work not only offers a simple way to achieve the direct electrochemical behavior of metalloporphyrin but also expands the potential applications of MOFs-based composites in bioanalysis.
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University , Yangzhou 225002, PR China.|Department of Chemistry, University of South Florida , 4202 East Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University , Yangzhou 225002, PR China.
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University , Yangzhou 225002, PR China.
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University , Yangzhou 225002, PR China.
authors.forename: Xiaoya
authors.initials: X
authors.lastname: Hu
authors.affiliation: Department of Chemistry, University of South Florida , 4202 East Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Shengqian
authors.initials: S
authors.lastname: Ma
keywords: electrochemical sensor; gold nanoparticles; hydroxylamine; metal−metalloporphyrin frameworks; metal−organic framework