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標題: | 製備含金屬奈米粒子之穩定乳液導電墨水 Encapsulated Metallic Nanoparticles in Water/Oil Emulsion for Stable Conductive Inks |
作者: | Chia-Wei Chang 張家維 |
指導教授: | 廖英志(Ying-Chih Liao) |
關鍵字: | 噴墨印刷,導電墨水,奈米銀粒子,奈米乳液,長期穩定性, Inkjet printing,Conductive ink,Silver nanoparticles,Nanoemulsion,Long-term stability, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 印刷電子是近年來快速發展的明星產業。噴墨印刷技術是其中相當被看好的ㄧ項製程,因其具有良好的解析度,適合印製精細的導電圖樣。奈米銀粒子墨水是目前被廣泛使用的導電噴墨墨水,然而其在長期存放下會產生團聚與沉降的現象,導致印刷時圖樣出現缺陷,甚至造成噴頭堵塞。銀粒子墨水穩定性不佳的原因在於粒子間強烈的凡德瓦吸引力。為了改善這個問題,本研究發展了ㄧ個新穎方法來增進墨水的穩定性。利用乳化的方式將銀粒子裝入液滴中,使銀粒子周圍產生ㄧ層保護液層以減少銀粒子之間的吸引力。本研究中以油包水之奈米乳液作為水性銀粒子之載體。為了使所有銀粒子能完全被液滴包覆,檢視了不同乳化劑濃度的影響。我們發現只有在液滴與銀粒子粒徑分布相差夠大時,所有銀粒子才能完全被包入液滴中。冷凍電鏡的觀察也證實了銀粒子被包裹在奈米乳液的液滴裡。含銀粒子乳液的沉降速度低於銀粒子懸浮原液且其沉降特性符合理論預期,顯示在適當的液滴大小下,含銀粒子液滴密度下降的幅度能彌補粒徑增大的影響,使銀粒子乳液墨水具有與原墨水相近之懸浮性。在一個月的儲存測試下,銀粒子懸浮原液在存放兩個禮拜後出現變質情況而乳液墨水仍保持良好之均勻狀態,顯示降低銀粒子間的凡德瓦力有效地增進了墨水之穩定性。最後,含銀粒子乳液經可噴印性分析後證實為可噴印之穩定墨水,其Z值為11.2,介於4-14的可噴印範圍內。在適當噴墨參數的調控下,能形成穩定而單獨的墨滴,可於紙上噴印出線寬約170 μm,電阻率4.92 μΩ-cm的長直銀粒子導線,顯示其在導電噴墨墨水上的應用潛力。 Silver nanoparticle (AgNP) inks are currently the most commonly used conductive ink for printed conductive tracks. However, the ink stability against aggregation and sedimentation is poor and results in short shelf life, severe nozzle clogging, and bad printing qualities. Herein, a new method is developed to improve the stability of AgNP inks. In this work, a water-in-oil type emulsion is used as a carrier for water-based silver nanoparticles. Different water/surfactant ratio are examined for the complete AgNP uptake in water nano droplets. The morphology of AgNP after emulsification is carefully examined with electro-microscopy to elucidate the particle engulfment in water. The encapsulated AgNP show a much lower sedimentation rate due to the greatly reduced overall density of encapsulated AgNPs/water droplets. Moreover, the water/oil interfaces around AgNPs prevent aggregations, and thus leads to better long-term ink stability. The physical properties of AgNP emulsion meet the requirement of the printer and stable inkjet droplet can be produced. Conductive tracks with electrical resistance 4.92 μΩ-cm and line width 170 μm can be printedon photo papers, which demonstrates the potential of the emulsion for inkjet printing application. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77744 |
DOI: | 10.6342/NTU201702526 |
全文授權: | 未授權 |
顯示於系所單位: | 化學工程學系 |
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