銀金屬在聚(3,4-二氧乙烯基噻吩)-聚苯乙烯磺酸的成長機制與形態探討

Investigation of Growth Mechanism and Silver Morphology in the PEDOT-PSSA

劉峻宏(Jyun-Hong Liou)

指導教授 ： 廖文彬

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.01915

摘要

本論文利用聚(3,4-二氧乙烯基噻吩)-聚苯乙烯磺酸(PEDOT-PSSA)具有氧化還原性質與硝酸銀進行還原反應，將其還原成銀金屬。並且透過反應參數的調控，探討銀金屬的形態變化。首先在還原時將PEDOT-PSSA大量稀釋的情況下，將導電度降低而藉由奈米銀顆粒的生成做為PEDOT的分布情形及尺寸之標定；接著在不稀釋時進行PEDOT-PSSA與硝酸銀的還原反應，比較不同濃度的PEDOT-PSSA對導電度的影響，並利用隨時間動態取樣的TEM鑑定，以澄清銀金屬的成長機制；最後在PEDOT-PSSA中加入過硫酸銨與硝酸銀進行還原反應，過硫酸銨同時破壞PEDOT的共軛結構，降低其導電度，也同時幫助銀金屬的成核及成長，且過硫酸銨是決定樹枝狀銀金屬結構生成的主要因素。

關鍵字

聚(3,4-二氧乙烯基噻吩)-聚苯乙烯磺酸 ； 形態 ； 導電度 ； 樹枝狀銀金屬

並列摘要

In this research, we have utilized the redox property of PEDOT-PSSA to conduct the reducing reaction of silver nitrate, and produced metallic silver. Through modifying the experimental parameters, we have investigated different silver morphologies. First, we have confirmed the distribution and size of PEDOT segments with lowering the conductivity in diluted PEDOT-PSSA. In order to compare the effect on the conductivity with different concentration of PEDOT-PSSA, we reduced silver nitrate to silver in the pristine concentration, and clarified the growth mechanism of silver with in-situ TEM observation. In the end, PEDOT-PSSA reacted with silver nitrate in additional ammonium persulfate (APS) solution. APS decomposed the conjugated structure of PEDOT, lowered the conductivity of PEDOT-PSSA and assisted both the nucleation and growth of the silver reduction simultaneously. Furthermore, APS is the major factor of generating the dendritic silver structure.

並列關鍵字

PEDOT-PSSA ； morphology ； conductivity ； dendritic silver

參考文獻

[54] 張智堯, “聚苯乙烯/銀之複合材料之製備,” 國立台灣大學碩士論文, 2010.

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