以複合電鑄製作多孔洞結構之研究

Abstract

隨著生物科技的進步，各種生物晶片不斷的被研發出來，而微過濾晶片是利用各種形狀的過濾通道，過濾出所需要的物質。本研究為了製作出多孔洞結構，將在氨基磺酸鎳電鑄液中以不同的石墨粉濃度及電流密度為參數進行複合電鑄，並且經由加熱處理使石墨氧化成為二氧化碳以製造出多孔結構，根據這些多孔結構的孔徑大小可以獲得各種規格的過濾結構元件。 實驗結果發現，電鑄層結構會隨電流密度的增加而更加緊密，而當石墨粉濃度提高時，鑄層中石墨粉的分佈密度會隨之提高，然而其鑄層組織卻會越來越鬆散。而電鑄最後的結果顯示，石墨粉容易被金屬鎳完全的包覆，很難與氧反應成二氧化碳，必須設法予以改善，否則將無法形成多孔洞結構。

With the progress of bio-technology, bio-chips for various applications have been developed. The microfilter chip is developed to filter the needed substances by various shape of filter channel. In this thesis, the concentration of graphite powder in the liquid nickel sulfamate and current density are chosen as parameters for composite electrodeposition of nickel and graphite powder. In addition, after electrodepositing, the graphite powder is oxidized into carbon dioxide through heating process for obtaining porous structure. Filter devices of various specifications can be made by controlling the hole dimension of the porous structure.

Experimental results revealed that the increasing current density impacted the structure of composite layer. The concentration of graphite powder in the composite layer increased with that in the electroforming solution, resulting in an incompact composite layer. However, the graphite powder was easily covered by nickel which hindered the graphite powder from oxidizing during the subsequent heating process, causing failure in the fabrication of porous structure. Further studies focus on this problem are necessary.