Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha 2713, Qatar.
Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha 2713, Qatar; Biomedical Research Center, Qatar University, Doha, PO Box 2713, Qatar.
Int J Biol Macromol. 2019 Apr 1;126:151-158. doi: 10.1016/j.ijbiomac.2018.12.213. Epub 2018 Dec 22.
Graphene based materials have attracted huge interest in recent years due to their outstanding properties and applications in various fields including bioengineering, electronics, nanotechnology, composite materials and many more. Despite numerous reports on synthesis of graphene, the mass production of high quality graphene in an inexpensive and eco-friendly method has remained as a challenge. In this work, we present a simple and green method for biosynthesis of graphene by using nontoxic reducing agent from Allium Cepa (onion) extracts. Modified Hummers' method was used to synthesis the Graphene oxide (G0) and extracts from Allium Cepa was used as reducing agent. The prepared graphene was analyzed by Raman spectroscopy, XRD, FTIR, SEM, TEM and XPS. The experimental results showed that GO was successfully reduced to graphene using onion extract. The Raman spectroscopy results, XPS results and XRD results confirmed the reduction of GO to graphene. The SEM and TEM results also reconfirmed the reduction of GO into graphene, where GO exhibited different morphologies, i.e. hexagonal larger sheets than graphene. The antibacterial properties of the graphene were studied against two gram-negative and gram-positive bacteria. Graphene inhibited cell growth, which proves that our prepared graphene can be useful as an antimicrobial agent against different microorganisms. This work thus reports the design of a novel, facile synthetic route for a new production method of graphene.
近年来，由于其在生物工程、电子、纳米技术、复合材料等各个领域的优异性能和应用，基于石墨烯的材料引起了人们的极大兴趣。尽管有大量关于石墨烯合成的报道，但以廉价且环保的方法大规模生产高质量石墨烯仍然是一个挑战。在这项工作中，我们提出了一种使用洋葱提取物中无毒还原剂生物合成石墨烯的简单绿色方法。采用改进的 Hummers 法合成氧化石墨烯（GO），并使用洋葱提取物作为还原剂。通过拉曼光谱、XRD、FTIR、SEM、TEM 和 XPS 对制备的石墨烯进行了分析。实验结果表明，GO 成功地被洋葱提取物还原为石墨烯。拉曼光谱、XPS 和 XRD 结果证实了 GO 被还原为石墨烯。SEM 和 TEM 结果也再次证实了 GO 被还原为石墨烯，其中 GO 表现出不同的形态，即比石墨烯更大的六边形薄片。研究了石墨烯对两种革兰氏阴性菌和革兰氏阳性菌的抗菌性能。石墨烯抑制了细胞生长，这证明我们制备的石墨烯可用作对抗不同微生物的抗菌剂。因此，这项工作报告了一种设计新颖、简便的合成路线，用于生产石墨烯的新方法。
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