Electrochemical Sensor Applications Of Micro/nanofibers Prepared By Electrospinning Technology

In recent years, electrospinning technology because of its simple and easy to operate, high yield, size-controlled and other characteristics, it gets researchers highly favored in the field of synthesis of nanomaterials. Electrospinning technique has been used as an efficient method to obtain of continuous fibers with diameters down to a few nanometers. The as-prepared fibers possess small fiber diameters, high specific surface area, and porosity. In this paper, we build a functional one-dimensional micro/nanostructures materials, combined with the roasting process or by direct methods such as dispensing micro-nanofiber membrane to modified electrode surface. Then we constructed novel and with highly catalytic electrochemical sensors based on the electrospinning technology, the contents are as follows:1. Ni(Ac)2-PVP fibers were prepared on the gold electrode by electrospinning technology, nickel oxide(Ni O) micro/nanofibers and Ni O/Au modified electrode were obtained by subsequent thermal treatment. Scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD)techniques were performed to the fibers, the fibers remained with net-like structures.A novel electrochemical sensor(Ni O/Au) was fabricated. The electrocatalytic properties of Ni O/Au for sodium nitrite(Na NO2) electro-oxidation were thoroughly investigated by CV and IT. The result indicated that the modified electrode exerts excellent sensitivity, the electrode responded linearly to Na NO2 in a concentration range from 5.25×10-6to 2.36×10-4mol/L, linear correlation coefficient is 0.9996, and the detection limit as low as 2.72×10-6 mol/L.2. The Si WA-Zn O micro/nanofibers were modified on the glassy carbon electrode(GCE) via drip coating method. The electrocatalytic properties of modified GCE for potassium iodate(KIO3) electro-oxidation were studied. Scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD) techniques were performed to the fibers, the fibers remained with net-like structures, the Si WA successfully incorporated into the Zn O fibers, and the characteristic structure of Si WA and Zn O remained unaltered after calcination. The electrochemical properties of Si WA-Zn O were investigated by CV, the catalytic oxidation for neurotransmitter KIO3 was studied using differential pulse voltammetry(DPV). The result indicated that the Si WA-Zn O/GCE electrode showed excellent electrocatalytic activity toward the oxidation of KIO3. The detection range of KIO3 was 5.00×10-9 to 2.00×10-5 mol/L, linear correlation coefficient is 0.9996, limit of detection was 3.67×10-9mol/L.