聚(3-己基噻吩)溶液製備銀金屬與成長機制之探討

Abstract

本研究中，我們將聚(3-己基噻吩)以溶液的方式直接浸泡於非溶劑中，待聚(3-己基噻吩)被溶劑膨潤後，再放入含硝酸銀之非溶劑中還原出網狀結構之銀金屬。本論文旨在探討此系統中網狀銀金屬的成長機制及聚(3-己基噻吩)的形貌對於銀金屬還原之影響。 在甲醇/甲苯共溶劑的系統中，聚(3-己基噻吩)經過膨潤後密度並不會小於共溶劑的密度而浮起，因此整個被膨潤的聚(3-己基噻吩)表面就是一個大的模板，提供銀離子在上面還原而得到網狀銀金屬。經XRD及TEM的鑑定發現此網狀銀金屬的晶體方位排列具有高度的一致性，且主要晶面為{111}面族以及<110>的晶面成長方向。預估此種晶體方位排列的特性對銀金屬在導電能力的方面有更優異的表現。 另外我們也以不同比例的甲醇/甲苯共溶劑來調控溶劑對於聚(3-己基噻吩)的膨潤度，因而影響聚(3-己基噻吩)的導電能力。並且以成核和成長的比值的角度，來說明導電度如何控制銀金屬還原的形貌。

In this study, we immersed poly (3-hexylthiophene) solution directly in non-solvent. After the poly (3-hexylthiophene) was swollen by the non-solvent, it was then put into another poor solvent containing silver nitrate to reduce mesh-liked silver. The purpose of this thesis is to investigate the growth mechanism of mesh-liked silver and the effect of poly (3-hexylthiophene) morphology on the reduction of silver in this system. In the methanol/toluene mixed solution system, the density of swollen poly(3-hexylthiophene) is not less than the density of the mixed solution, so the entire swollen poly(3-hexylthiophene) surface is a large template, which provides silver ions to reduce and grow into mesh-liked silver. Through XRD and TEM diffraction pattern, it was found that the structure of the mesh-liked silver has a high degree of crystal orientation consistency, and the main crystal faces are the {111} face family and the <110> crystal face growth direction. The evaluation of the characteristics of such a crystal orientation gives the silver a superior performance in terms of electrical conductivity. In addition, we also adjusted the swelling degree of the solution for poly(3-hexylthiophene) with different ratios of methanol/toluene mixed solution to affect the conductivity of poly(3-hexylthiophene). By the difference in the conductivity of poly(3-hexylthiophene), the relationship between nucleation and growth is adjusted to control the morphology of silver metal reduction.