| This paper mainly studied the layered double hydroxides（LDH）-based nonenzymaticglucose sensor constructed by layer-by-layer（LBL） self-assembly method, mainly includingfour parts as follows:（1） This paper synthesized cobalt aluminium layered double hydroxides （CoAl-LDH）and nickel aluminum layered double hydroxides （NiAl-LDH） by co-precipitation, which werecharacterized by using X ray diffraction spectrum, infrared spectrum and SEM.（2） The multilayer film electrode was prepared by electrostatic LBL self-assembly ofnegatively charged polystyrene sulfonate sodium （PSS） and positively charged CoAl-LDH,which can detect glucose due to the reversible Co（III）/Co（II） redox activity center ofCoAl-LDH in alkaline condition. UV–Vis spectroscopy was used to monitor the uniform LBLself-assembly of CoAl-LDH and PSS. Electrochemical study discussed the effects of differentlayers on the sensor electrochemical behaviour, and the performance of electrocatalyticoxidation glucose with the multilayer film electrode was studied. The linear response range ofthe sensor to the glucose is5.0×10–66.63×10–4mol/L, the sensitivity is up to4.96×10–4A.L.mol-1,correlation coefficient is0.9999, detection limit is2.8×10–6mol/L（S/N=3）.（3） The PSS/NiAl-LDH multilayer film electrode was constructed by LBL self-assemblymethod, which can detect glucose due to the reversible Ni（III）/Ni（II） redox activity center ofNiAl-LDH in alkaline condition. UV–Vis spectroscopy was used to monitor the uniform LBLself-assembly of NiAl-LDH and PSS. Electrochemical study discussed the effects of differentlayers on the sensor electrochemical behaviour, and the performance of electrocatalyticoxidation glucose with the multilayer film electrode was studied. The linear response range ofthe sensor to the glucose is5.0×10–76.61×10–4mol/L, the sensitivity is up to8.88×10–4A.L.mol-1, correlation coefficient is0.9999, detection limit is2.78×10–7mol/L.（4） By LBL self-assembly of PSS wrapped carbon anotubes（CNTs@PSS） andCoAl-LDH, the CNTs@PSS/CoAl-LDH multilayer film electrode was constructed. Theelectronic transfer promotion function of CNTs improved the sensor performance for glucose.UV–Vis spectroscopy and Electrochemical impedance spectroscopy was used to monitor theuniform LBL self-assembly of CoAl-LDH and CNTs@PSS. Electrochemical study discussedthe effects of different layers on the sensor electrochemical behaviour, and the performance ofelectrocatalytic oxidation glucose with the multilayer film electrode was studied. The linearresponse range of the sensor to the glucose is3.0×10-64.98×10-4mol/L, the sensitivity is upto1.03×10–3A.L.mol-1, correlation coefficient is0.999, detection limit is1.6×10–6mol/L。... |
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