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Synthesis of Cu or Cu_2O-polyimide nanocomposites using Cu powders and their optical properties

机译：铜粉合成Cu或Cu_2O-聚酰亚胺纳米复合材料及其光学性能

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摘要

Nanocomposites consisting of Cu or Cu_2O nanoparticles in various polyimide (PI) films were successfully prepared using polyamic acid (PAA) and Cu powders. Cu powders were dissolved into PAA solutions, and the solutions were spin-coated onto the substrates. Cu or Cu_2O nanoparticles were formed in PI film by curing in a reducing or inert atmosphere, respectively. The Cu nanoparticles were transformed to Cu_2O nanoparticles by post-heat treatment in an oxidizing atmosphere after curing in a reducing atmosphere. Transmission electron microscopy showed that uniform, round Cu_2O nanoparticles 6.0 nm in diameter were dispersed in the PI film by post-heat treatment. The addition of Cu_2O nanoparticles in the 4,4′- (hexafluoroisopropylidene)diphthalic anhydride-4,4′-oxydianiline (6FDA-ODA) PI film enhanced the refractive index of the 6FDA-ODA PI film from 1.60 to 1.72 at 633 nm, and the transparency of the nanocomposite film was about 70-90% in the visible region and remained around 90% beyond 550 nm.
机译：使用聚酰胺酸（PAA）和铜粉成功地制备了由各种聚酰亚胺（PI）膜中的Cu或Cu_2O纳米颗粒组成的纳米复合材料。将铜粉溶解到PAA溶液中，然后将溶液旋涂到基材上。通过在还原性或惰性气氛中固化分别在PI膜中形成Cu或Cu_2O纳米粒子。在还原性气氛中固化后，通过在氧化性气氛中进行后热处理将Cu纳米颗粒转变为Cu_2O纳米颗粒。透射电子显微镜显示，通过后热处理将直径为6.0 nm的均匀的圆形Cu_2O纳米颗粒分散在PI膜中。在4,4'-（六氟异亚丙基）二邻苯二甲酸酐-4,4'-氧二苯胺（6FDA-ODA）PI膜中添加Cu_2O纳米颗粒可将6FDA-ODA PI膜在633 nm处的折射率从1.60提高到1.72，纳米复合膜的透明性在可见光区域约为70-90％，在550 nm以上仍保持约90％。

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