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Electrochemical Synthesis, Characterization and Influencing Factors of Dendritic Micro-/Nano-materials

Author: ZhangYongMei
Tutor: NiYongHong
School: Anhui Normal University
Course: Materials Physics and Chemistry
Keywords: Micro / nano materials Electrodeposition method Influencing factors Morphology Evolution
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


Dendritic micro / nano-structure compared with other structures, usually with a large surface area, allows the hetero structure, and easy to form a continuous network structure characteristics. Therefore, the preparation of the dendritic structure may nanodevices in future applications provide new opportunities. This paper mainly uses a simple, fast, energy-saving electrodeposition route the successful synthesis of the dendritic metal and metal telluride micro-and nano-materials, phase and morphology of the product by the X-ray powder diffraction analyzer (XRD), energy dispersive spectrum (EDS), (high-resolution) transmission electron microscopy (HR / TEM), selected area electron diffraction (SAED) and scanning electron microscopy (SEM) were characterized. The systematic study of factors, such as the starting amount of the reactants, complexing agent, a surface active agent, a deposition current or voltage, etc. affect the dendrimer nanomaterials morphology formed and investigated the product morphology evolution. The main research contents are as follows: 1. Using a simple constant current electrodeposition route, Bi (NO 3 ) 3 · 5H 2 O as the starting material, 4 mA deposition current deposited under 5min, in air at room temperature under succeeded in synthesizing dendrimers Bi nanostructures. Morphology evolution dendritic nanostructures is proved by the irregular nanoparticles evolved. The experiments show that the state of presence of the Bi (III) in the system, the deposition time and some of the complexing reagent can strongly influence the morphology of the final product. Furthermore, it was found that the obtained product has the potential value of the detected in the aqueous solution of Cd. 2 using the same electrochemical route to Pb (NO 3 ) 2 mixed system and tartaric acid as the electrolyte, copper as the working electrode, at 4mA current deposition the 5min, successful synthesis of the micro-structure of a large number of dendritic grading the lead. The system studied the influence of various parameters such as the deposition current and the deposition time and additives Pb micro-structure is formed on the classification. Found that tartaric acid and Pb (NO 3 ) 2 essential for the formation of hierarchical Pb microstructures. The experiments also show that the anionic surfactant SDBS can be strongly affected by the morphology of the final product; the time-dependent morphological evolution experiments show fractal Pb micro-structure is grown irregular particles from the original orientation. A simple potentiostatic electrochemical method, deposition voltage of -0.2 V deposition 5min successfully synthesized a dendritic PbTe microstructures. The systematic study of the deposition time, voltage ligand reagents and Pb 2 ion source factors on the the dendritic the PbTe micro structure formed. The results show that the ligand reagent, Pb 2 ion source and the deposition voltage and other parameters have a great impact on the formation of the final product morphology. Wherein, disodium ethylenediaminetetraacetate (EDTA), and the ratio of tartaric acid and the amount of tartaric acid was significantly affect the morphology of the PbTe. The time-dependent morphology evolution: feathery of PbTe dendritic structure by approximately spherical nanoparticles, the three steps of the flower-like structure and feathery branches evolved; bush-like nanosheets superimposed PbTe microstructures is experienced irregular nano-particles, approximately spherical particles, nano sheet to build a flower-shaped particles, immature bushes like micro-structure and the mature bushes like micro-structure process. At room temperature, Cu (CH 3 COO) 2 , Na2TeO3 and nitric acid as the electrolyte deposited at 5 min 16 mA deposition current successfully prepared a polycrystalline Cu 7 Te 4 dendritic micro-structure. Deposition current, the ligand reagent surfactant, Cu (CH 3 COO) 2 the starting amount and the Cu 2 source factors 4 formed the dendrimers of Cu 7 Te. Experimental results show that the low deposition current and Cu (CH 3 COO) 2 concentration not easy to generate the nano-particles consisting of dendrimers of Cu 7 Te < sub> 4 micro-structure. The morphology evolution experiments showed that the polycrystalline Cu 7 Te 4 dendritic structure of self-assembled nanoparticles grown.

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