以硝酸銀為前驅物，甲醛為還原劑，高分子的PVP 或小分子的硫化去楊酸為保護劑，有機鹼作為還原促進劑，經由化學還原法製備奈米銀懸浮液。反應中使用三乙基胺和吡啶兩種不同鹼度的有機鹼進行反應。

首先使用高分子 PVP 作為保護劑的實驗結果顯示，強鹼性三乙基胺所還原的奈米銀粒子尺寸為 20-30 nm之間。使用弱鹼性的吡啶還原奈米銀粒子形成更小尺寸的奈米粒子，粒徑大小為 10-20nm 。奈米銀懸浮液使用兩種有機鹼可減低金屬離子污染並使溶液安定懸浮。經過低溫燒結後，可以成功形成所需的銀薄膜。

其次使用小分子硫化去楊酸來作為保護劑的實驗結果得知，所還原的奈米銀粒子尺寸為 5-10 nm。加入三乙基胺後，可形成安定的懸浮液。在低溫進行金屬燒結處理，可得到完整的銀薄膜。經由旋轉塗佈並經燒結後，不但可得平整的薄膜，並且經電阻值量測後，電阻值達到 4.29×10-5 Ω-cm。

Silver nanoparticles suspensions were synthesized by chemical reduction reaction of silver nitrate in formaldehyde reductant with polyvinyl pyrrolidone ( PVP ) or thiosalicylic acid ( TSA ) as stabilizer . Two organic bases with different basicity , triethylamine or pyridine , were used in the reaction .

A high molecular weight organic compound, polyvinyl pyrrolidone ( PVP ) , was first used as the protecting agent . Experimental results showed that the sizes of silver particles prepared from the more basic triethylamine were around 20-30 nm. The particles made from the less basic pyridine had smaller particle sizes ( 10-20 nm ) . The suspensions of silver nanoparticles prepared by both methods were free from any metal ion contamination suitable for use in microelectronic application. After low temperature sintering , thin silver films can be formed.

A low molecular weight organic compound , thiosalicylic acid ( TSA ) , was also used as the protecting agent . Experimental results showed that the sizes of silver particles prepared from this method were around 5-10 nm . Adding triethylamine can stabilize silver suspension . After spin-coating and low temperatures sintering , it can form a smooth thin silver film and has a resistivity of 4.29×10-5Ω-cm .

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