微奈米銅粉擁有許多特性如表面活性高、良好的導電及導熱性能、低熔點、非常低的電阻值等，與貴金屬導體相比價格低廉，因此在許多方面極具發展潛力與應用價值，而這些特性都是由於微奈米銅粉的尺寸非常小，使其具有極大的表面積而導致。
本研究以硫酸銅為前驅鹽、次亞磷酸鈉為還原劑，利用化學還原法合成分散性佳、粒徑均一之微奈米銅粉。以Bloom number 300明膠(G1)、Bloom number 75-100明膠(G2)及阿拉伯膠為分散劑，所得銅粉以XRD、BET、SEM及TEM進行分析。分散劑分子量越高所得之銅粉一次粒子及二次粒子越大，其添加量也越多；以連續定量方式加入反應槽進行還原，由於溶液中Cu2+濃度變化較小，可改進銅粉粒徑之均一性。使用明膠(G2)時銅粉有最小一次粒子(20 nm)與二次粒子(100 nm)；添加阿拉伯膠可得均一性及分散性最佳之銅粉，其一次粒子及二次粒子粒徑分別為40 nm與250 nm。

Micro/nano copper particles show a wide variety of unique properties, such as high surface activity, high electrical and thermal conductivity, relatively low melting temperature. Its price is much cheaper than precious metals. Thus they have significant potential for many applications. Such unique properties arise from their small sizes which correspond to their high surface area.
Well dispersed and narrow-sized micro/nano copper particles were prepared using chemical reduction method with CuSO4 as the precursor, NaH2PO2 as the reducing agent, and bloom number 300 gelatin(G1), bloom number 75-100 gelatin(G2) and gum arabic as the dispersants. Characterization of copper particles was performed by XRD, BET, SEM and TEM. For high molecular weight dispersants, the sizes of the primary particles and secondary particles and the dosage of dispersant also increase. When CuSO4 solution was added dropwisely, the size distribution of copper particles was narrowed, which probably is due to small Cu2+ concentration change. The sample of smallest primary particle(20 nm) and secondary particle(100 nm) was obtained when gelatin(G2) was used as dispersant. The best result of well dispersed and narrow-sized copper particles were obtained by using gum arabic as dispersant, the size of primary particle and secondary particle was 40 nm and 250 nm respectively.

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