The Study of the Electrical Conductivity and Preparation of Reduced Graphene Oxide /Silver Composite Adhesives

• Main Authors: Miao-Yi Hsieh, 謝妙宜
• Other Authors: 陳志恆
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/7df76c

碩士 === 國立臺北科技大學 === 資源工程研究所 === 103 === Reduced graphene oxide (rGO) can be widely applied in various fields, such as transparent electrode, biochemical sensors, capacitors, solar cells, and electrically conductive adhesives (ECAs), due to its tunable surface chemical property, excellent electrical and optical properties. In this study, the rGO was synthesized by using simple solution process. By adding a small amount of silver particles, the conductivity of rGO can be enhanced. The rGO or rGO/Ag was used as filler in the preparation of ECAs. Percolation threshold of the ECAs was reduced due to the high aspect ratio of rGO. There are three parts in the thesis: (1) to discuss the optimal preparation conditions and the structural change of GO during Modified Hummers method with different amount of oxidants, (2) to discuss the optimal reduction conditions by Vitamin C for the better conductivity of rGO and rGO/Ag by using Taguchi experimental design, and (3) to prepare the ECAs with rGO/Ag composite by two-step and one-step method. From the results, the oxygen-containing functional groups onto the GO surface were increased with increasing the amount of oxidant when using Modified Hummers method to synthesize GO. The optimized ratio of oxidant/graphite was at 4. The rGO and rGO/Ag were successfully prepared by using the nontoxic Vitamin C to reduce the majority oxygen-containing functional groups of graphene oxide at the optimal reduction conditions. The conductivity of the rGO and the rGO /Ag were 57.8 and 123.0 S/cm, respectively. For the reduction of GO, the Vitamin C (a green reductant) had a good ability to reduce GO to prepare rGO in this study. In addition, from the results of the preparation of electrically conductive adhesives, the loading content of rGO and rGO/Ag were low than that of silver-based electrically conductive adhesives at the same conductivity. Therefore, the rGO/Ag prepared in this study can be used as filler, which reveals good potential to replace the Ag particles in the ECAs.