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Nano-materials synthesis and quantization capacitor charging

Author: ZhouPei
Tutor: HuXiaoYa；GuoRong
School: Yangzhou University
Course: Physical and chemical
Keywords: Capacitor charging Quantization Nano-materials Copper nanoparticles Micro - platinum electrode Dithizone Scanning electron microscope Electron microscopy Monolayer cluster
CLC: TB383
Type: Master's thesis
Year: 2004
Downloads: 76
Quote: 0
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Abstract


1 Quantized Capacitance Charging of Monolayer-protected Clusters with a Pt UltramicroelectrodeThe behavior of quantized capacitance charge of the monolayer protected clusters (MFCs) with the diameter of 1.5nm in tetrahydrofuran (THF) solution with the Ultramicroelectrode have been investigated. The results showed that many advantages over the bulk Pt electrode were achieved in characteristics of MPCs with a Pt Ultramicroelectrode. The microelectrode exhibited six pairs of quantized capacitance charging peaks in 0.1mol/L THF solution of hexanethiolate monolayer protected gold clusters in the absence of electrolyte by the differential pulse voltammetry. The fine electrochemical reversible of quantized capacitance charging peaks was observed even under higher scan rate of cyclic voltammetry. The experiments of one potential step chronocoulometrydisplayed that each peak of differential pulse voltammetry corresponded to an electron transfer across the interface of the MPCs.2 Synthesis and characteristics of monolayer-protected clustersof Au clusters modified with diphenyl thiocarbazoneA new method for synthesis of monolayer-protected clusters (MPCs) was described. In the new two-phase system of tetrahydrofuran/saturated electrolyte, the Cu2+ anion was reduced quickly by sodium borohydride in the presence of diphenyl thiocarbazone from which the uniform smaller size of MPCs were obtained. TEM and UV-vis were carried out to investigate the particle. A new PVC membrane of AuCl4- ion selective electrode was prepared by mixing the powder of CuMPCs into PVC membrane. This electrode was used to detect AuCl4- in water and good stability and reproducibility were acquired with the good Nernst response and the slope and fine detection limit.3 Synthesis and characteristics of water-soluble cysteine protected Cu clustersCysteine was chosen as the protector to synthesize the monolayer-protected copper clusters, and sodium borohydride was used as the reducing agent. The synthesis of colloidal copper and capping with cysteine were described in the aquatic environment. The functionalized nanoparticles were characterized by transmission electron microscopy, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and so on. Different synthesis conditions were discussed. The results showed that dimensions controllable of copper nanoparticles were successfully synthesized.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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