Defective graphene as a high-efficiency Raman enhancement substrate
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：Tong Zhao Zhibo Liu Xing Xin Hui-Ming Cheng Wencai Ren
文章页码：1996 - 2002
摘 要：Pristine graphene（PG）has been demonstrated to be an excellent substrate for Raman enhancement,which is called graphene-enhanced Raman scattering.However,the chemically inert and hydrophobic surface of PG hinders the adsorption of molecules especially in aqueous solutions,and consequently limits the Raman enhanced efficiency.Here,we synthesized defective graphene（DG）films by chemical vapor deposition on Au,which has a defect density of ～2.0×1011cm-2.The DG shows a much better wettability than PG towards dye solution.Combining with the strong adsorption ability of defects to molecules,DG shows greatly enhanced efficiency than PG with perfect lattice.For example,the detection limit for rhodamine B can reach 2×10-9M for DG while it is on the order of 10-7M for PG.In addition,DG has high enhancement uniformity and the Au substrate can be reused after electrochemical bubbling transfer.These advantages suggest the great potential of the DG grown on Au for practical applications in environmental monitoring.
Tong Zhao1,2，Zhibo Liu1，Xing Xin1,3，Hui-Ming Cheng1,2,4，Wencai Ren1,2
1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences2. School of Material Science and Engineering, University of Science and Technology of China3. University of Chinese Academy of Sciences4. Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University
摘 要：Pristine graphene（PG）has been demonstrated to be an excellent substrate for Raman enhancement,which is called graphene-enhanced Raman scattering.However,the chemically inert and hydrophobic surface of PG hinders the adsorption of molecules especially in aqueous solutions,and consequently limits the Raman enhanced efficiency.Here,we synthesized defective graphene（DG）films by chemical vapor deposition on Au,which has a defect density of ～2.0×1011cm-2.The DG shows a much better wettability than PG towards dye solution.Combining with the strong adsorption ability of defects to molecules,DG shows greatly enhanced efficiency than PG with perfect lattice.For example,the detection limit for rhodamine B can reach 2×10-9M for DG while it is on the order of 10-7M for PG.In addition,DG has high enhancement uniformity and the Au substrate can be reused after electrochemical bubbling transfer.These advantages suggest the great potential of the DG grown on Au for practical applications in environmental monitoring.
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