A Nonenzymatic Glucose Sensor Based on Layer by layer Self-assembly of NiAl-layered Double Hydroxide and Polyelectrolyte

KeyWord:nickel aluminium layered double hydroxide  nonenzymatic method  glucose  layer by layer self-assembly  electrode

Abstract:

      The nickel aluminium layered double hydroxides(NiAl-LDH) were synthesized by coprecipitation method.With the layer by layer(LBL) self-assembly of polystyrene sulfonate sodium(PSS) and NiAl-LDH£¬the PSS/NiAl-LDH multilayer electrode was constructed£¬and applied in the determination of glucose.The X-ray diffraction£¬Infrared and SEM spectra of NiAl-LDH showed that it had the typical LDH characteristic peaks and morphology.The UV-Vis spectrum was used to monitor the uniform LBL self-assembly of PSS and NiAl-LDH.Electrochemical study showed that glucose could be effectively catalyzed oxidation with NiAl-LDH mutlitlayer electrode.Under the optimal conditions£¬the sensor showed a good linear relationship in the range of 5.0¡Á10-7-6.6¡Á10-4 mol/L for glucose with a sensitivity of 8.9¡Á10-4A?L?mol-1 and a detection limit(S/N=3) of 2.8¡Á10-7 mol/L.