ADSORPTION OF PHENOL ON GOLD AS STUDIED BY CAPACITANCE AND REFLECTANCE MEASUREMENTS
ADSORPTION OF PHENOL ON GOLD AS STUDIED BY CAPACITANCE AND REFLECTANCE MEASUREMENTS
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DOI：
10.1021/la00054a037
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发表时间：
1991-06-01
期刊：
影响因子：
3.9
通讯作者：
ARVIA, AJ
中科院分区：
文献类型：
--
作者：
LEZNA, RO;DETACCONI, NR;ARVIA, AJ
用电容法和调制反射法研究了苯酚在多晶金电极上的吸附。 检测到两个主要过程。 首先，在电极上的负电荷处观察到吸附-脱附峰，这与通过其π系统结合到表面的分子的平坦构型有关。 在这种情况下，吸附的苯酚和电极之间的相互作用不足以改变金属的固有光学性质。 第二个电容峰，检测到的金属上的正电荷的区域，被发现显示滞后，此外，它扭曲了金的电反射效应到这样的程度，分离的光学效果的电荷和覆盖范围是不可能的。 这种形成强共价键的典型行为，与分子通过其氧原子从平面到垂直附着于金属的重新取向有关。
Adsorption of phenol on a polycrystalline gold electrode has been studied by capacitance and modulated reflectance measurements. Two main processes were detected. First, an adsorption-desorption peak was observed at negative charge on the electrode which was related to a flat configuration of the molecule bonded to the surface through its pi system. In this case the interactions between adsorbed phenol and the electrode are not strong enough to modify the intrinsic optical properties of the metal. A second capacitive peak, detected over a region of positive charge on the metal, was found to show hysteresis and, besides, it distorts the electroreflectance effect of gold to such an extent that separation of the optical effects of charge and coverage was not possible. This behavior, typical of the formation of strong covalent bonds, was associated with the reorientation of the molecule from flat to vertically attached to the metal by means of its oxygen atom.