以具有拉曼散射表面活性的金纳米棒(AuNRs)与氧化石墨烯(GO)溶液混合。通过控制AuNRs的尺寸、用量,抽滤制得氧化石墨烯/金纳米棒(GO/AuNRs)复合薄膜。利用紫外-可见分光光度计、透射电子显微镜(TEM)对制得的GO/AuNRs进行了表征和分析,并且采用拉曼光谱研究GO/AuNRs基底的表面增强散射(SERS)效应。结果表明,GO/AuNRs基底的SERS性能能够对芳香烃类大分子物质起到信号增强的作用。以罗丹明B(RhB)为探针分子验证其拉曼增强效应,在超微量浓度时依然具有较强的拉曼信号,增强因子达到2250。
The gold nanorods (AuNRs) owned the surface activity of Raman scattering was mixed with the graphene oxide (GO) solution.A variety of GO/AuNRs hybrid substrate was able to achieve by alter the size and dosage of AuNRs.The prepared GO decorated with AuNRs was characterized and analyzed by UV-Vis spectrometer and transmission electron microscopy (TEM),meanwhile the surface enhanced Raman scattering (SERS) was researched by Raman spectrometer.The results showed that combined with the advantages of GO and AuNRs respectively in the research and application about SERS,the performance of GO/AuNRs can enhance the signal enhancement of aromatic hydrocarbon macromolecules.A verification method by using Rhoda mine B (RhB) was adopted for SERS performance,the strong Raman signal was still existed when the concentration was ultramicro,the average enhancement factor was up to 2250.
[1] Xu W,Mao N N,Zhang J.Graphene:a platform for surface-enhanced raman spectroscopy[J].Small,2013,9(8):1206-1224.
[2] Polavarapu L,Liz-Marzan L M.Towards low-cost flexible substrates for nanoplasmonic sensing[J].Physical Chemistry Chemical Physics,2013,15(15):5288-5300.
[3] Kanchanapally R,Sinha S S,Fan Z,et al.Graphene oxide-gold nanocage hybrid platform for trace level identification of nitro explosives using a raman fingerprint[J].Journal of Physical Chemistry C,2014,118(13):7070-7075.
[4] Ding G,Xie S,Liu Y,et al.Graphene oxide-silver nanocomposite as SERS substrate for dye detection:effects of silver loading amount and composite dosage[J].Applied Surface Science,2015,345:310-318.
[5] Ye X,Zheng C,Chen J,et al.Using binary surfactant mixtures to simultaneously improve the dimensional tunability and monodispersity in the seeded growth of gold nanorods[J].Nano Letters,2013,13(2):765-771.
[6] Daniele N,Valeria A,Roberta S,et al.The production of concentrated dispersions of few-layer graphene by the direct exfoliation of graphite in organosilanes[J].Nanoscale Research Letters,2012,7(1):1-7.
[7] Venugopal G,Krishnamoorthy K,Mohan R,et al.An investigation of the electrical transport properties of graphene-oxide thin films[J].Materials Chemistry & Physics,2012,132(1):29-33.
[8] 吴娟霞,徐华,张锦.拉曼光谱在石墨烯结构表征中的应用[J].化学学报,2014,72(3):301-318.
[9] Yu X,Cai H,Zhang W,et al.Tuning chemical enhancement of SERS by controlling the chemical reduction of graphene oxide nanosheets[J].Acs Nano,2011,5(2):952-960.
基金资助
国家自然科学基金项目(61575139,51602213,11604236)
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