Characterization Of Metal Nanowires Array And PANI-metal Nanocables Array

The purpose of this dissertation is to study the electrochemical preparation, characterization of metal （Cu, Co, and Ag） nanowire arrays and Polyaniline （PANI）-metal nanocable arrays. Metal nanowire arrays and PNAI-metal coaxial nanocable arrays of different longth, diameter and thickness of PANI are prepared, and the formation mechanism are studied. We studied the field emission properties, conductance, and photoelectrode characterization of metal nanowire arrays. The supercapacitor, field emission properties, and sensor characteriazations of PANI-metal nanocable arrays are investigated. The photoelectrode characterization of TiO₂/PNAI-Ag is also researched.Anodic aluminum oxide （AAO） membranes with diameter of 80nm, 120nm and 160nm are prepared by two-step oxidation, and then equipped to be AAO electrode. Co, Cu, and Ag nanowire arrays with different length （2μm,5μm,10μm and 20μm respectively） and diameters （80nm, 120nm, and 160nm respectively） are obtained, and the field immision properties are subsequently investigated. The above metal nanowire arrays all show excellent field immsion properties. As the increase of the longth and the decrease of diameters of the nanowire arrays, the properties increased. Co nanowire arrays with diameter of 60nm length of 20μm showed a turn-on field of 1.66 V/μm, and a field enhancement factor ofβ=3054.PANI nanowire arrays with different diameters （80nm, 120nm, and 160nm respectively） the same length 20μm, and PANI-Ag, PANI-Cu, and PANI-Co coaxial nanocable arrays with different thickness of PANI （2, 5, 10, 15, 25, and 35nm） are prepared by electrodeposition. The conductance research showed that as the diameters of the metal nanowires increasing, the conductance increased. On the contrary, for the PANI-Co, PANI-Cu, PANI-Ag nanocable arrays of the same diameter, the conductance reduced as the thickness of PANI increased.After Ag nanowire arrays and PANI-Ag nanocable arrays, of the same length and diameters while the thickness of PANI is 25nm, are prepared,the field emission property was tested respectively and compared. Ag nanowire arrays showed showed a turn-on field of 1.74 V/μm, a field enhancement factor ofβ=2967, while PANI-Ag nanocable arrays showed a turn-on field of 1.69 V/μm, a field enhancement factor ofβ=827. The result comes to a conclusion that the field emision properties of PANI-Ag nanocable arrays is abvisible lower than Ag nanowires.After the preparation of TiO₂/PANI-Ag nanocable arrays by electrodeposition, the photoelectrode characterization was investigated. The photoelectric measurement result shows the signal of open-circuit potential curve conversed obviously.PANI-Ag coaxial nanocable arrays with different length （1.5μm, 5μm, and 10μm respectively）and different thickness （1, 5, 10, 25 and 35nm respectively） of PANI were obtained, and equiped to be supercapacitor. The length of nanocable arrays shows insignificant effect on the change of specific capacitance. The specific capacitance of nanocable arrays 10μm long is maximal, up to 283F/g. The specific capacitance droped dramatically, while the thickness of PANI increased. Nanocable arrays capacitor is mostly redox capacitor。PANI-Ag nanocable with different length （1.5μm, 5μm, and 10μm respectively） and the same diameter– 80nm were prepared, and subsequent testing of dopamine and Vitamin C in phosphate buffer was carried out. The results showed that the sensitivity was improved while the increase of length of nanocable arrays.