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Functionalization of gold and graphene electrodes by p-maleimido-phenyl towards thiol-sensing systems investigated by EQCM and IR ellipsometric spectroscopy

机译：EQCM和红外椭偏光谱法研究对马来酰亚胺基苯基对巯基传感系统对金和石墨烯电极的功能

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Highlights • Gold and graphene electrodes can be functionalized using the diazonium route. • Reductive electrografting enables maleimido-functionalization of the electrodes. • Nanoscale layers are characterized by EQCM and IR ellipsometric spectroscopy. • EQCM shows less electrostatic interaction of ions on graphene compared to Au surface. • Immobilization of terminal thiol containing molecules was proven by IR ellipsometric spectroscopy. Abstract Electrografting of gold and graphene surfaces by functional p‐(N‐maleimido)phenyl groups was performed by reduction of p‐(N‐maleimido)phenyldiazonium tetrafluoroborate. The reduction was carried out using cyclic voltammetry coupled with micro-gravimetric measurements by means of electrochemical quartz crystal microbalance (EQCM). The overall deposited mass on gold was higher than on graphene. However, the Faradaic efficiency was lower on Au (14%) compared to graphene (22%) after the first potential scan. Subsequently, the maleimide functional groups have been tested for immobilization of terminal thiols using (4-nitrobenzyl)mercaptan for the functionalized graphene surface and a cysteine-modified peptide for the functionalized gold surface. The functionalization by p‐(N‐maleimido)phenyl groups and the following thiol coupling of the particular surface was proven by infrared spectroscopic ellipsometry (IRSE). In addition, the interaction of the tetrabutylammonium and tetrafluoroborate ions present in the electrolyte with the Au and graphene electrodes was investigated by EQCM and revealed less electrostatic interaction of graphene with these ions in solution compared to the metal (Au) surface.
机译： 突出显示 • 可以使用重氮途径对金和石墨烯电极进行功能化。 • 还原性电接枝能够使电极进行马来酰亚胺官能化。 • 纳米尺度的层由EQCM和红外椭偏光谱法表征。 • EQCM显示，与Au表面相比，石墨烯上离子的静电相互作用较小。 < / ce：list-item> • 固定末端硫醇红外椭偏光谱法证实了其中包含的分子。 摘要 金和石墨烯表面的电接枝通过对-（N-马来酰亚胺基）苯基重氮四氟硼酸盐的还原来进行功能性对-（N-马来酰亚胺基）苯基的反应。还原是通过循环伏安法结合电化学石英微天平（EQCM）进行微重力测量而进行的。金的总沉积质量高于石墨烯。但是，在第一次电势扫描之后，与石墨烯（22％）相比，法拉第效率在Au（14％）上要低。随后，已经使用（4-硝基苄基）硫醇对官能化的石墨烯表面和半胱氨酸改性的肽对官能化的金表面测试了马来酰亚胺官能团对末端硫醇的固定。红外光谱椭圆偏光法（IRSE）证明了对-（N-马来酰亚胺基）苯基的官能团和特定表面的以下硫醇偶联作用。此外，通过EQCM对电解质中存在的四丁基铵和四氟硼酸根离子与Au和石墨烯电极的相互作用进行了研究，发现与金属（Au）表面相比，石墨烯与溶液中的这些离子之间的静电相互作用较小。

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  • 来源
    《Applied Surface Science》 |2017年第ptab期|755-760|共6页
  • 作者

    Tilmann J. Neubert; Felix Rösicke; Guoguang Sun; Silvia Janietz; Marc A. Gluba; Karsten Hinrichs; Norbert H. Nickel; Jörg Rappich;

  • 作者单位

    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik;

    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik,Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA);

    Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V., ISAS-Berlin;

    Fraunhofer-Institut für Angewandte Polymerforschung;

    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik;

    Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V., ISAS-Berlin;

    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik;

    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik;

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  • 正文语种 eng
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  • 关键词

    Maleimido functionalization; Thiol-coupling; Bio-sensing; Graphene; EQCM; IR ellipsometric spectroscopy;

    机译：马来酰亚胺基官能化;硫醇偶联;生物传感;石墨烯;EQCM;红外椭偏光谱法;

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