Fabrication And Catalytic Property Towards Glucose Oxidation Of Nanostructured Materials From Zr-based Amorphous Alloys

Glucose is an important substance in food industry,medical health and pharmacy.So far,glucose sensors have been developed for four generations.The non-enzymatic glucose sensors are based on the direct oxidation of glucose on the surface of the electrodes avoiding the utilization of enzyme,so they are less affected by the environments.With the development of nanotechnology,the sensing properties of non-enzymatic glucose sensors with nanostructure have been improved significantly.Now the researchers focus on the fabrication of non-enzymatic glucose sensors with different nanostructures and active elements.In this work,nanostructured materials were fabricated from Zr-based amorphous precursors with different Nb addition.Then the catalytic properties to glucose oxidation were investigated.The main contents include:1.Vertical nanotube arrays were fabricated by anodization of Zr₅₆Al₁₆Co_28-xNb_x(x=0,1,3,5 at.%)amorphous precursors.The effects of Nb content in the precursors,anodizing voltage and concentration of NH₄F in solution on the microstructure of nanotube arrays were studied.The experimental results illustrated that the morphology and average diameter of nanotubes could be adjusted effectively which is beneficial to the functional application of the nanotubes.2.Ni-decorated ZrAlCo-O nanotube arrays(Ni/ZAC-O NTAs)have been fabricated via pulse electrodeposition of Ni into ZrAlCo-O nanotube arrays(ZAC-O NTAs)which were obtained by anodization of Zr₅₆Al₁₆Co₂₈ amorphous precursor.Compared with ZAC-O NTAs,the electrocatalytic performance of Ni/ZAC-O NTAs toward glucose oxidation was improved significantly with ultra high sensitivity of 1553.0?AmM^-1cm^-2 and lower detection limit of 1.02?M(S/N=3).In addition,Ni/ZAC-O NTAs demonstrated superior selectivity,reproducibility and could be used in glucose detection in serum sample.3.A unique Ni covered nanotube nanostructure(Ni@ZACN-O NTAs)was fabricated via pulse electrochemical deposition method using Zr₅₆Al₁₆Co₂₃Nb₅-O nanotube arrays(ZACN-O NTAs)as substrate,which can be directly used as electrode for non-enzymatic glucose sensing.The core-shell-like nanostructure exhibited stable electrochemical property under different deformation conditions as well as excellent catalytic properties to glucose catalysis,with the sensitivity of 1539.0?AmM^-1cm^-2,linear range of 0-0.65 mM and a catalytic constant of 603.13M^-1s^-1.4.A highly sensitive and selective nanoporous cobalt/glass carbon electrode(NP Co/GCE)was fabricated by electrochemical dealloying of Zr₅₆Al₁₆Co₂₈ amorphous alloy.After dealloying,a homogeneous and continuous nanoporous structure was obtained with an average pore size of 64 nm and ligament size of 52 nm.The electrochemical performance of NP Co/GCE electrode was evaluated by cyclic voltammetry and amperometric experiment.NP Co/GCE electrode exhibited good electrocatalytic property in the detection of glucose with sensitivities of 223?A mM^-1cm^-2 and 40.5?A mM^-1cm^-2 at wide linear range of 0-9.5 mM,which are much higher than those of bulk Co.In addition,the nanoporous electrode presents great selectivity and fast current response.