The Preparation And Electrochemical Sensor Performance Of The NiHCF/PANI/CNTs Electroactive Hybrid Film

The research of electrochemical sensor attracts the widespread attention of people as one of main research direction of electroanalysis field. The focus of the study of electrochemical sensor is the improvement and enhance of the modified material. Organic/inorganic composite materials have both advantages of organic materials and inorganic materials, and its application in electrochemical sensors have a good development prospects. Synergistic effects exist in between organic component and inorganic component of NiHCF/PANI/CNTs composite material, and that improve the stability and the electrochemical sensor performance of materials. So, the electrochemical sensor performance of this composite material was researched. The main work of this research includes below two sections:First of all, electroactive NiHCF/PANI/CNTs composite film was prepared on Pt electrode by a one-step copolymerization using cyclic voltammetry. The molecular structure and morphology of this composite film was investigated by scanning electron microscopy (SEM) and FT-IR. The stability and electrochemical sensor performance of this composite film was researched by using cyclic voltammetry and chronoamperometry. Results show that the composite film has the excellent electrocatalytical response to the oxidation of AA; in the solution containing0.1mol/L PBS and0.1mol/L KNO3, there is a good current responses of composite films to AA with the linear range from1×10-5to1.4×10-4mol/L, with the correlation coefficient of0.9966, a detection limit of6.09×10-6mol/L and a sensitivity of754.8mA·M-1·cm-2. And then, the electrocatalytic activity of this composite film on hydrogen peroxide was researched in the solution containing0.05mol/L KCl and0.05mol/L PBS (pH6.5) by chronoamperometry, the detection sensitivity of the composite films is2288mA·M-1·cm-2, the detection limit is1.24×10-7mol/L. There is good linear relationship between the the current responses of hydrogen peroxide and the concentration of hydrogen peroxide from1.25×10-5to1.25×10-4mol/L. In addition, we can control the detection sensitivity of the composite films by controlling preparation time.Secondly, NiHCF/PANI/CNTs composite film was prepared by a one-step copolymerization using double-pulse. Relaxation of pulse was utilized to prepare the composite film with uniform distribution and consistent partical size. The molecular structure and morphology of this composite film was investigated by scanning electron microscopy (SEM) and FT-IR. The stability and electrochemical sensor performance of this composite film was researched by using cyclic voltammetry and chronoamperometry. Results show that in the solution containing0.05mol/L KC1and0.05mol/L PBS (pH6.5) at-0.2V, the composite film has the high sensitivity to electrocatalytical activity on hydrogen peroxide, here is good linear relationship between the the current responses of hydrogen peroxide and the concentration of hydrogen peroxide from1.25×10"6-2.95×10-3mol/L, with the correlation coefficient of0.9980, a detection limit of1.25×10-6mol/L(30) and a sensitivity of3119mA·M-1·cm-2. Compared with the composite film prepared by a one-step copolymerization using cyclic voltammetry, the linear range was wide and the sensitivity was higher.