Single-Step Process toward Achieving Superhydrophobic Reduced Graphene Oxide
Single-Step Process toward Achieving Superhydrophobic Reduced Graphene Oxide
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DOI：
10.1021/acsami.6b01227
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发表时间：
2016-05-04
影响因子：
9.5
通讯作者：
Khor, Khiam Aik
中科院分区：
文献类型：
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作者：
Li, Zhong;Tang, Xiu-Zhi;Khor, Khiam Aik
我们报告了首次使用放电等离子烧结（SPS）作为单步工艺来实现超疏水性还原氧化石墨烯（rGO）。研究发现，SPS 能够将光滑且电绝缘的氧化石墨烯 (GO) 片转化为高导电性的 rGO，其残留氧量最少，分级粗糙度在长时间超声处理后仍能保持良好状态。在低于常规GO剥离临界温度的500℃温度下，GO成功剥离、还原和分级粗糙化。在1050℃下仅处理1分钟即可制备出超疏水的rGO，其表面粗糙度（R-a）是GO的10倍，并且具有极高的C：O比（83.03（原子％））和水接触角153度。这表明SPS是一种优越的GO还原技术，能够一步快速有效地实现超疏水性rGO。此外，SPS制备的超疏水rGO在水溶液和固态下都对大肠杆菌表现出令人印象深刻的细菌防污和灭活作用。预计本研究中获得的超疏水 rGO 可用于广泛的工业和生物医学应用，例如自清洁和抗菌表面的制造。
We report the first use of spark plasma sintering (SPS) as a Single-step process to achieve superhydrophobic reduced graphene Oxide (rGO). It was found that SPS was capable of converting smooth and electrically insulating graphene oxide (GO) sheets into highly electrically conductive rGO with minimum residual oxygen and hierarchical roughness which could be well retained after prolonged ultrasonication. At a temperature of 500 degrees C, which is lower than the conventional critical temperature for GO exfoliation, GO was successfully exfoliated, reduced, and hierarchically roughened. rGO fabricated by only 1 min of treatment at 1050 degrees C was superhydrophobic with a surface roughness (R-a) 10 times as large as that of GO as well as an extraordinarily high C:O ratio of 83.03 (atom %) and water contact angle of 153 degrees. This demonstrates that SPS is a superior GO reduction technique, which enabled superhydrophobic rGO to be quickly and effectively achieved in one single step. Moreover, the superhydrophobic rGO fabricated by SPS showed an impressive bacterial antifouling and inactivation effect against Escherichia coli in both aqueous solution and the solid state. It is envisioned that the superhydrophobic rGO obtained in this study can be potentially used for a wide range of industrial and biomedical applications, such as the fabrication of self-cleaning and antibacterial surfaces.