| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 106 === The main purpose of this study was to use nano-silver of different dimensions mixed styrene thermoplastic elastomer(TPE-SEBS) to make stretchable conductive silver paste. Silver paste uses direct coating / screen printing method to make stretchable conductive circuit. Finally, material properties of high conductivity (〖10〗^(-2)Ω/sq) , high stretchability, and hysteresis resistance were successfully prepared. And the stretchable conductive circuit was applied to the electrodes of the smart clothing sensing component for measuring the signal of the human body.
TPE-SEBS is light weight, high elasticity, environmental protection and safety (Approved by FDA), but TPE-SEBS is an insulating polymer material. Therefore, we use silver powder of different dimensions for blending and adding to the elastic polymer to form a stable three-dimensional network conductive structure. When the amount of conductive filler added reaches the penetration threshold of the composite conductive material, the conductivity will increase sharply and reach electrical stability.The main reason for mixing conductive materials of different dimensions is to make the composite conductive material form a three-dimensional conductive structure and enhance the overall continuous conductive contact. This method can prevent the breakage of the conductive connection point of the composite conductive material in the stretched state, causing the electrical conductivity of the composite material to drop or lose conductivity.
Due to the resilience of the structure of the elastic polymer material, the conductive composite material can be allowed to return to the unstretched state after being stretched to achieve electrical stability after stretching. The conductive network structure doesn’t cause the breakage of the conductive contacts after stretching under the coating of the elastic polymer, and the overall recovery of the conductive circuit structure after stretching provides the composite conductive material with good electrical conductivity stability.
In the end, electrode elements for sensing body signals were successfully prepared. The composite conductive materials themselves have low resistance and therefore can be more effectively and stably used in electrocardiogram (ECG) signal sensing. Future applications can be extended to flexible circuit boards, smart gloves, electronic skin, and devices that require high tensile flex circuits.
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