A multi-step reduction process was developed to produce reduced graphene oxide (rGO) paper for electromagnetic interference (EMI) shielding. First step reduction was achieved by hydroiodic acid to remove most of the oxygen-containing functional groups, and sodium borohydride was used in the second step reduction to reduce carbonyl group which is the most difficult functional group to remove. In the last step reduction, hydroiodic acid was used as reducing agent again to remove the remaining oxygen-containing functional groups. The results show that this method can greatly improve the conductivity and EMI shielding performance of rGO paper. The resulting rGO paper with a C/O ratio of 19.38 and a thickness of 9.1[Formula: see text][Formula: see text]m exhibited high conductivity of 1084[Formula: see text]S/cm and excellent average EMI shielding efficiency of 45.84[Formula: see text]dB in the X-band, better than that reduction by other chemical methods.

中文翻译：

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多步法合成用于EMI屏蔽的还原氧化石墨烯纸

开发了一种多步还原工艺来生产用于电磁干扰 (EMI) 屏蔽的还原氧化石墨烯 (rGO) 纸。第一步还原采用氢碘酸去除大部分含氧官能团，第二步还原采用硼氢化钠还原最难去除的官能团羰基。在最后一步还原中，再次使用氢碘酸作为还原剂以去除剩余的含氧官能团。结果表明，该方法可以大大提高rGO纸的导电性和EMI屏蔽性能。所得 rGO 纸的 C/O 比为 19.38，厚度为 9.1[公式：见正文][公式：见正文]m 表现出 1084 的高电导率[公式：