運用化學器相沈積法成長奈米碳管需使用金屬為觸媒，其中又以鐵、鈷和鎳三種最常被使用和討論。 然而，研究報導指出，含二種元素所組成的合金觸媒對於控制碳管生長的型態，管徑等具有極佳的效果。 本研究的目的在於使用鎳銅合金來探討成分改變對成長碳管的影響。 選用原因為鎳已知對碳管成長具有活性，而銅則否，藉由加入銅來改變鎳對生長碳管的活性；又二者有相同的結晶結構， 故可排除可能產生介金屬化合物對實驗的影響。 實驗結果顯示，當鎳/銅的成分比例為80/20時，碳管具有極佳的結晶性。 隨著銅含量的增加，碳沈積物也由管狀變成纖維。 若銅含量增加到60%時，將有捲曲的碳纖產生。 這可能是由於形成合金後，觸媒的表面性質和電子組態改變所導致。 從電子組態的觀點而言， 每一個凝態鎳原子含有0.6個電子空缺，每一個凝態銅原子則不含任何的空缺，故合金中的銅含量到達60%時，將不再具有空缺，也意謂著活性的消失。 從表面性質的觀點而言，由於銅的表面自由能小於鎳，使得銅原子在合金中傾向集中於表面，故有可能是這些不具活性的表面銅原子限制了碳析出的區域，而造成碳管型態的改變。

Carbon nanotubes are known to be synthesized by catalytic chemical vapor deposition (CCVD). Catalysts, e.g., Fe, Ni, Co, etc. play an important role in the process of synthesizing. Other elements, e.g., Cu, though showing no effect on the growth, have been used to enhance the catalytic effect of Ni by alloying it with Ni. In this study, microwave plasma enhanced chemical vapor deposition (MPECVD) was used to grow one -dimensional carbon nanostructured materials on silicon. The results showed that the increase of Cu from 20 at% to 40 at% changes the morphology of carbon from tubules to filaments, and the tangled conditions are less observed in this Ni-Cu alloy range. Straight carbon nanotubes were effectively catalyzed at Cu< 40 at%, and interestingly enough the occurrence of spiral carbon nanofibers(~100 nm) at Cu > 60 at%. Therefore, it is not surprising that Ni is a typically effective catalyst for carbon nanotubes. The catalytic effect of Cu-Ni alloys is prominent at Cu<60 at%, where d-band is unfilled and favors the catalysis of carbon nanotubes. Above 60 at% Cu, the filled d-band is less favorable for the growth of one–dimensional carbon nanostructured materials.

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