Chemical Reduction of Graphene Oxide to Graphene by Sulfur-Containing Compounds

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• 作者：Wufeng Chen ; Lifeng Yan ; P. R. Bangal
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 2, 2010
• 年：2010
• 卷：114
• 期：47
• 页码：19885-19890
• 全文大小：318K
• 年卷期：v.114,no.47(December 2, 2010)
• ISSN：1932-7455

文摘

Instead of hydrazine, a series of sulfur-containing compounds such as NaHSO₃, Na₂SO₃, Na₂S₂O₃, Na₂S·9H₂O, SOCl₂, and SO₂, were used as reducing agents to reduce graphene oxide to graphene. Fourier transform infrared spectrometry, atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, elemental analysis, and thermogravimetric analysis confirmed the formation of graphene under chemical reduction at 95 °C. The results reveal that the reducing ability of NaHSO₃ is comparable to that of hydrazine. This newly found reducing agent is of low toxicity and nonvolatile, which makes the reduction much safer than hydrazine. A possible mechanism of the reduction has been suggested. The electrical conductivity of the graphene paper prepared using a NaHSO₃ reducing agent is found to be 6500 S mp>−1p>, while it is observed to be 5100 S mp>−1p> for hydrazine-reduced graphene paper. These studies also confirmed that SOCl₂ can be a good candidate as a reducing agent to compete with hydrazine.