| Summary: | 碩士 === 中原大學 === 物理研究所 === 102 === In this research, the carbon aerogels were prepared by sol-gel sythesis, in which resorcinol and formaldehyde monomers were used as the precursors. Deionized water was used as the solvent. Sodium carbonate was used as the catalyst. We analyzed the influences on the structures and the electrical characteristics of the carbon aerogels by changing the parameters, including the concentrations of the precursors and the catalyst, the temperature of the carbonation process, and whether the carbon aerogels were activated or not.
In our experiments, we used the Thermo Gravimetric Analysis (TGA) to observe the changes of the carbon aerogels through the pyrolysis process. Scanning Electron Microscope (SEM) was used to analyze the surface morphology. Surface Area and Pore Analysis (BET) was used to measure the specific surface and the pore characteristics. Lastly, we used the Four-Point Probe method and the Impedance Analyzer for the electrical measurements.
As the result of this experiment, we have obtained the sample of the specific surface area of 805.3 m2/g and the pore diameter of 10.2 nm. In the sample, the molar ratio of resorcinol to formaldehyde (R/F) was fixed at 0.5 and the molar ratio of resorcinol to sodium carbonate (R/C) was at 1000. After added with the deionized water, the sample was treated through the carbonation at 800 ℃ and the activation. Moreover, the above parameters, but without adding the deioized water, have contributed to the highest electrical conductivity of the carbon aerogel which was 4.3×10-3 S/cm.
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