高分子型分散劑穩定金屬奈米粒子於複合材料之電子裝置應用

Abstract

本論文主要分為兩部分。第一部分則是將高分子分散劑(PTT1-B1)分散奈米銅粒子並製成高導電膜及銅粉。第二部分則將高分子分散劑(POEM)用於奈米銀粒子分散製成高導電膜及可穿戴技術裝置。一系列高分子分散劑藉由不同比例之溶劑進行合成。此外，高分子分散劑主鏈具備調控官能基及分子結構。反應時其分子量變化與官能基皆用酸價 (Acid Value)、傅里葉轉換紅外光譜 (Fourier Transform InfraRed, FT-IR)及凝膠滲透層析儀 (Gel permeation chromatography, GPC)分析以進行控制。 高分子分散劑(PTT1-B1)分散於奈米銅粒子及添加還原劑NaBH4 在不同溫度緩慢上升至300℃，觀察表面高分子型態及製程導電裝置。研究發現添加其分散劑有助於奈米粒子之分散，及不同濃度之比例可以提升其導電值效益。所製備之奈米銀粒子及銅粒子皆由穿透式電子顯微鏡(Transmission electron microscope, TEM) 觀察評估其分散性。 高分子分散劑(POEM)的部分，經由高分子分散劑溶於不同有機及無機溶劑及脫層之奈米矽片中，觀察奈米銀粒子及奈米矽片之分散性之影響。觀察在不同比例之銀含量製成之奈米銀粒子經由不同的溫度，觀察其導電性變化，最後將其最佳比例，製成以銀為導電的新穎性可穿戴技術裝置結合心電圖(Electrocardiogram)觀察運動間之變化。

The thesis consists of two parts; the first part their application in PTT1-B1 dispersant prepared to form highly conductive copper power and nanohybrid films by chemical methods. The second part is the immobilization of silver nanoparticles in POEM dispersant prepared to form highly conductive nanohybrid films for wearable electronic devices. A family of home-made polymeric dispersant synthesized by different molar ratio. Besides, the products contain structure features including ester linking and molecular structure in branched shape. The structures of the polymeric dispersant were characterized by using acid value (AV), Fourier-Transformed Infrared Spectrometry (FT-IR) and gel permeation chromatography (GPC). High electrical conductivity copper power and films prepared with a PTT1-B1 dispersant. Also they were prepared on a 1-µm-thick film with a low sheet resistance of 6.92×10-2 Ω/sq, achieved through the surface migration of silver nanoparticles and prepared by sintering at 300◦C with NaBH4 as a reductant to form an interconnected network. Eventually, transmission electron microscopy shows that the production of silver nanoparticles and copper nanoparticles were synthesized by the in situ chemical reduction. Our POEM dispersant approach results high electrical conductivity after they were easily prepared from organic/inorganic nanohybrid solutions containing an organic polymeric dispersant and exfoliated clay which shows the performance to silver nanoparticles (AgNPs) etched on Clay substrates. During sintering, the color of the hybrid film changed from gold to milky white, suggesting the migration of silver nanoparticles and the formation of an interconnected network. The results show promise for the fabrication of novel silver-based electrocardiogram electrodes and a flexible wireless electrocardiogram measurement system for wearable electronics. Thin films of silver nanoparticles were prepared on a 1-µm-thick film with a low sheet resistance of 8.24×10−4 Ω/sq.