云母片上单层石墨烯的制备及拉曼光谱研究
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摘要
采用拉曼表征技术研究了平铺到云母片上单层石墨烯的性质.首先,将单晶白云母暴露在辐照量为1×10~6个/cm~2的重离子中进行辐照,用HF溶液对辐照后的云母片进行蚀刻.之后将CVD(化学气相沉积)法制得的单层石墨烯转移平铺到云母片上,利用SEM、Raman技术对悬空(孔洞之上)及非悬空区域的石墨烯进行分析表征.实验结果表明,辐照后的云母片在HF(体积分数40%)中置于30℃水浴超声蚀刻20 min后产生孔径约为3μm的菱形孔洞.而平铺在云母上的单层石墨烯样貌完整,部分悬空区域处的石墨烯有所破裂,且破裂面积随孔径增大而增多.利用拉曼电镜对悬空区域进行探测,可以得到仅有单层石墨烯的拉曼信号.采用石墨烯/云母基底对生物探针分子进行拉曼表征,结果显示该基底对探针分子的拉曼信号有增强作用.
Raman characterization technique was used to study the properties of a single layer of graphene laid on mica sheet.Single crystal white mica was exposed to heavy ions with irradiation amount of1×10~6/cm~2 for irradiation.HF solution was used to etch the irradiated mica sheet.Hung(holes)and the impending area of graphene was characterized by SEM,and Raman.The experimental results show that after irradiation the mica sheet in HF(40%)with 30℃water bath ultrasonic etching after 20minutes produces with diamond holes aperture size of about 3micron.Tile on mica assumes a complete monolayer graphene,graphene partly on the impending area of has cracks,and crack increased with the increase of the aperture and the area.Through Raman microscope detection of monolayer graphene dangling without crack,Raman signals ofthe single layer graphene were obtained.Raman characterization of the biological probe molecules by using graphene/mica substrate showed that the substrate enhanced Raman signals of the probe molecules.
Raman characterization technique was used to study the properties of a single layer of graphene laid on mica sheet.Single crystal white mica was exposed to heavy ions with irradiation amount of1×10~6/cm~2 for irradiation.HF solution was used to etch the irradiated mica sheet.Hung(holes)and the impending area of graphene was characterized by SEM,and Raman.The experimental results show that after irradiation the mica sheet in HF(40%)with 30℃water bath ultrasonic etching after 20minutes produces with diamond holes aperture size of about 3micron.Tile on mica assumes a complete monolayer graphene,graphene partly on the impending area of has cracks,and crack increased with the increase of the aperture and the area.Through Raman microscope detection of monolayer graphene dangling without crack,Raman signals ofthe single layer graphene were obtained.Raman characterization of the biological probe molecules by using graphene/mica substrate showed that the substrate enhanced Raman signals of the probe molecules.
引文
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[3]GAO Y W,HAO P.Mechanicalproperties of monolayer graphene under tensile and compressive loading[J].Mechanical Properties of Monolayer Graphene under Tensile and Compressive,2009(41):1561-1566.DOI:10.1016/j.physe.2009.04.033.
[4]BALANDINA A,GHOSH S,BAOW Z,et al.Superior thermal conductivity of single-layer graphene[J].Nano Letters,2008,8(3):902-907.DOI:10.1021/nl0731872.
[5]LI D,KANER R B.Materials Science-graphene-based materials[J].Science,2008,320(5880):1170-1171.DOI:10.1126/science.1158180.
[6]ZHANG L Y,ZHANG L,ZHAN J,et al.In situ growth of three-dimensional graphene coatings on arbitrary-shaped micronano materials and its mechanism studies[J].Carbon,2011(92):84-95.DOI:10.1016/j.carbon.2015.03.033.
[7]JIANG J W.Buckled graphene for efficient energy harvest,storage and conversion[J].Nanotechnology,2016,27(40):476-482.DOI:10.1088/0957-4484/27/40/405402.
[8]FOOM E,GOPINATH S.Feasibility of graphene in biomedical application[J].Biomedicine&Pharmacotherapy,2017(94):354-361.DOI:10.1016/j.biopha.2017.07.122.
[9]GEIMA K.Graphenestatus and prospects[J].Science,2009,324(5934):1530-1534.DOI:10.1126/science.1158877.
[10]ANS J,ZHU Y W,LEES H,et al.Thin film fabrication and simultaneous anodic reduction of deposited graphene oxide platelets by electrophoretic deposition[J].JournalofPhusical Chemistry Letters,2010,1(8):1259-41263.DOI:10.1021/jz100080c.
[11]VO-VAN C,KIMOUCHE-RESERBATPA,FRUCHART O,et al.Epitaxial graphene prepared by chemical vapor deposition on single crystal thin iridium films on sapphire[J].Applied Physics Letters,2011,98(18):181903.DOI:10.1063/1.3585126.
[12]SUTTER P W,AIBRECHT P M,SUTTER E A.Graphene growth on epitaxial ru thin films on sapphire[J].Applied Physics Letters,2010,97(21):213101.DOI:10.1063/1.3518490.
[13]YOUY M,NIZ H,YU T,et al.Edge chirality determination of graphene by Raman spectroscopy[J].Applied Physics Letters,2008,93(16):163112.DOI:10.1063/1.3005599
[14]RYUS M,LIU L,BERCIAUD S,et al.Atmospheric oxygen binding and hole doping in deformed graphene on a SiO2substrate[J].Nano Letters,2010,10(12):4944-4951.DOI:10.1021/nl1029607.