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聚甲基丙烯酸甲酯间隔的金纳米立方体与金膜复合结构的表面增强拉曼散射研究

王向贤 白雪琳 庞志远 杨华 祁云平 温晓镭

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聚甲基丙烯酸甲酯间隔的金纳米立方体与金膜复合结构的表面增强拉曼散射研究

王向贤, 白雪琳, 庞志远, 杨华, 祁云平, 温晓镭

Surface-enhanced Raman scattering effect of composite structure with gold nano-cubes and gold film separated by polymethylmethacrylate film

Wang Xiang-Xian, Bai Xue-Lin, Pang Zhi-Yuan, Yang Hua, Qi Yun-Ping, Wen Xiao-Lei
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  • 金属纳米颗粒与金属薄膜的复合结构由于其局域表面等离子体和传播表面等离子体间的强共振耦合作用, 可作为表面增强拉曼散射(SERS)基底, 显著增强吸附分子的拉曼信号. 本文提出了一种聚甲基丙烯酸甲酯(PMMA)间隔的90 nm金纳米立方体与50 nm金膜复合结构的SERS基底, 通过有限元方法数值模拟, 得到PMMA的最优化厚度为15 nm. 实验制备了PMMA间隔层厚度为14 nm的复合结构, 利用罗丹明6G (R6G)为拉曼探针分子, 633 nm的氦氖激光器作为激发光源, 研究了复合结构和单一金纳米立方体的SERS效应, 发现复合结构可以使探针分子产生比单一结构更强的拉曼信号. 在此基础上, 研究了不同浓度金纳米立方体水溶液条件下复合结构中R6G的拉曼光谱. 结果表明, 当金纳米立方体水溶液浓度为5.625 ${\text μ}{\rm g/mL}$的条件下复合结构中R6G的拉曼信号最强, 且可测量R6G的最低浓度达10–11 mol/L.
    The composite structure of metal nanoparticle and metal film can be used as a surface-enhanced Raman scattering (SERS) substrate to significantly enhance the Raman signal of adsorbed molecules due to the strong coupling between local surface plasmons and propagating surface plasmons. An SERS substrate of the composite structure with gold nano-cubes and gold film separated by polymethylmethacrylate (PMMA) film is proposed. The optimum thickness of PMMA is 15 nm obtained by numerical simulation through using finite element method. The composite structure of PMMA spacer with a thickness of 14 nm is prepared experimentally. Using R6G as the Raman probe molecules and He-Ne laser with a wavelength of 633 nm as an excitation source, the SERS effect of the composite structure and single gold nano-cubes are studied. It is found that the composite structure can make the probe molecules produce a stronger Raman signal than the single structure. Furthermore, the SERS spectra of R6G molecules on the composite structure under the condition of aqueous solution of gold nano-cubes with different concentrations are studied. The results show that when the concentration of gold nano-cubes’ aqueous solution is 5.625 ${\text{μ}}{\rm g/mL}$, the SERS signal of the R6G molecules on the composite structure is strongest. The lowest concentration of R6G molecules which can be detected is about 10–11 mol/L.
      通信作者: 王向贤, wangxx869@126.com
    • 基金项目: 国家自然科学基金(批准号: 61505074)和兰州理工大学红柳一流学科建设计划资助的课题.
      Corresponding author: Wang Xiang-Xian, wangxx869@126.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61505074) and the HongLiu First-class Disciplines Development Program of Lanzhou University of Technology, China.
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  • 图 1  (a)金纳米立方体的SEM图; (b)金纳米立方体的吸收谱

    Fig. 1.  (a) SEM image of gold nano-cube; (b) absorption spectrum of gold nano-cube.

    图 2  10−4 mol/L的R6G、不同浓度金纳米立方体混合水溶液条件下玻璃基片上的SERS光谱

    Fig. 2.  SERS spectra of R6G molecules on the glass substrate in the conditions of the mixed aqueous solution of gold nano-cubes with different concentrations and R6G with the concentration of 10−4 mol/L.

    图 3  (a)复合结构中最大电场增强因子与PMMA厚度的关系; (b) 15 nm PMMA厚度下复合结构中的电场分布

    Fig. 3.  (a) Relationship between maximum electric field enhancement factor and the thickness of PMMA in composite structure; (b) electric field distribution of composite structure with a 15-nm-thick PMMA spacer.

    图 4  10−4 mol/L的R6G、不同浓度金纳米立方体混合水溶液条件下复合结构中的SERS光谱

    Fig. 4.  SERS spectra of R6G molecules on the composite structure in the conditions of the mixed aqueous solution of gold nano-cubes with different concentrations and R6G with the concentration of 10−4 mol/L.

    图 5  10−4 mol/L的R6G, 5.625 ${\text {\rm μg/mL}}$的金纳米立方体混合水溶液条件下玻璃基片和复合结构的SERS光谱

    Fig. 5.  SERS spectra of R6G molecules on the glass substrate and composite structure in the condition of the mixed aqueous solution of gold nano-cubes with the concentration of 5.625 ${\text {\rm μg/mL}}$ and R6G with the concentration of 10−4 mol/L.

    图 6  5.625 ${\text {\rm μg/mL}}$的金纳米立方体混合水溶液条件下, 复合结构的SERS光谱 (a)不同R6G浓度; (b) 10−11 mol/L的R6G浓度(1 M = 1 mol/L)

    Fig. 6.  SERS spectra of R6G molecules on the composite structure in the conditions of the mixed aqueous solution of gold nano-cubes with the concentration of 5.625 ${\text{\rm μg/mL}} \!\! :$(a) R6G with different concentrations of 10–6, 10−8, 10−10, 10–11 mol/L; (b) R6G with the concentration of 10−11 mol/L.

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    Liang C P, Niu G, Chen X F, Zhou Z G, Yi Z, Ye X, Duan T, Yi Y, Xiao S Y 2019 Opt. Commun. 436 57Google Scholar

    [2]

    Cen C L, Lin H, Huang J, Liang C P, Chen X F, Tang Y J, Yi Z, Ye X, Liu J W, Yi Y G, Xiao S Y 2018 Sensors 18 4489Google Scholar

    [3]

    Liu C, Su W Q, Liu Q, Lu X L, Wang F M, Sun T, Paul K C 2018 Opt. Express 26 9039Google Scholar

    [4]

    Liu Z, Yu M, Huang S, Liu X, Wang Y, Liu M, Pan P, Liu G 2015 J. Mater. Chem. C 3 4222Google Scholar

    [5]

    Wang X X, Wu X X, Chen Y Z, Bai X L, Pang Z Y, Yang H, Qi Y P, Wen X L 2018 AIP Adv. 8 105029Google Scholar

    [6]

    Yan Y X, Hua Y, Zhao X X, Li R S, Wang X X 2018 Mater. Res. Bull. 105 286Google Scholar

    [7]

    Zheng C X, Yang H 2018 J. Mater. Sci.: Mater. Electron. 29 9291Google Scholar

    [8]

    Zhao X X, Hua Y, Li S H, Cui Z M, Zhang C R 2018 Mater. Res. Bull. 107 180Google Scholar

    [9]

    Di L J, Yang H, Xian T, Chen X J 2018 Micromachines 9 613Google Scholar

    [10]

    Cen C L, Chen J J, Liang C P, Huang J, Chen X F, Tang Y J, Yi Z, Xu X B, Yi Y G, Xiao S Y 2018 Physica E 103 93Google Scholar

    [11]

    Liu Z, Liu X, Huang S, Pan P, Chen J, Liu G, Gu G 2015 ACS Appl. Mater. Inter. 7 4962Google Scholar

    [12]

    Yang L, Wang J C, Yang L Z, Hu Z D, Wu X J, Zheng G G 2018 Sci. Rep. 8 2560Google Scholar

    [13]

    Wang J C, Song C, Hang J, Hu Z D, Zhang F 2017 Opt. Express 25 23880Google Scholar

    [14]

    Zhang X W, Qi Y P, Zhou P Y, Gong H H, Hu B B, Yan C M 2018 Photon. Sens. 8 367Google Scholar

    [15]

    Chen J, Zhang T, Tang C J, Mao P, Liu Y J, Yu Y, Liu Z Q 2016 IEEE Photon. Tech. Lett. 28 1529Google Scholar

    [16]

    Chen J, Tang C J, Mao P, Peng C, Gao D P, Yu Y, Wang Q G, Zhang L B 2016 IEEE Photon. J. 8 4800107Google Scholar

    [17]

    Yang Z J, Zhao Q, He J 2017 Opt. Express 25 15927Google Scholar

    [18]

    Wang X X, Pang Z Y , Tong H , Wu X X, Bai X L, Yang H, Wen X L, Qi Y P 2019 Results Phys. 12 732Google Scholar

    [19]

    Pang Z Y, Tong H, Wu X X, Zhu J K, Wang X X, Yang H, Qi Y P 2018 Opt. Quant. Electron 50 335Google Scholar

    [20]

    Wang X X, Zhang D G, Chen Y K, Zhu L F, Yu W H, Wang P, Yao P J, Ming H, Wu W X, Zhang Q J 2013 Appl. Phys. Lett. 102 031103Google Scholar

    [21]

    Du H M, Zhang L P, Li D A 2018 Plasma Sci. Technol. 20 115001Google Scholar

    [22]

    Li D A, Zhang L P, Du H M 2018 Plasma Sci. Technol.Google Scholar

    [23]

    Shao H Y, Chen C, Wang J C, Pan L, Sang T 2017 J. Phys. D 50 384001Google Scholar

    [24]

    Liu G Q, Yu M D, Liu Z Q, Liu X S, Huang S, Pan P P, Wang Y, Liu M L, Gu G 2015 Nanotechnology 26 185702Google Scholar

    [25]

    Yu M D, Huang Z P, Liu Z Q, Chen J, Liu Y, Tang L, Liu G Q 2018 Sensor. Actuat. B: Chem. 262 845Google Scholar

    [26]

    李志远, 李家方 2011 科学通报 56 2631Google Scholar

    Li Z Y, Li J F 2011 Chin. Sci. Bull. 56 2631Google Scholar

    [27]

    Yi M F, Zhang D G, Wang P, Jiao X J, Blair S, Wen X L, Fu Q, Lu Y H, Ming H 2011 Plasmonics 6 515Google Scholar

    [28]

    Gonçalves R M 2014 J. Phys. D: Appl. Phys. 47 213001Google Scholar

    [29]

    Yan Z D, Du W, Tu L L, Gu P, Huang Z, Zhan P, Liuc F X, Wang Z L 2015 J. Raman Spectrosc. 46 795Google Scholar

    [30]

    Su X D, Ma X B, Wang J, Tu Z Z, Han Y J, Teng Z G 2018 J. Mol. Struct. 1171 202Google Scholar

    [31]

    Li R F, Shi G C, Wang Y H, Wang M L, Zhu Y Y, Sun X, Xu H J, Chang C X 2018 Optik 172 49Google Scholar

    [32]

    Kume T, Hayashiba S, Yamamotobo K 1996 Jpn. J. Appl. Phys. 35 171Google Scholar

    [33]

    Leveque G, Martin O J F 2006 Opt. Lett. 31 2750Google Scholar

    [34]

    Zhou L, Li M Y, Tang L H, He J J 2016 J. Phys.: Conference Series 680 012003Google Scholar

    [35]

    祁云平, 张雪伟, 周培阳, 胡兵兵, 王向贤 2018 物理学报 67 197301Google Scholar

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出版历程
  • 收稿日期:  2019-01-10
  • 修回日期:  2019-01-18
  • 上网日期:  2019-02-01
  • 刊出日期:  2019-02-05

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