Chen Lifu, Tanner Eden E L, Compton Richard G
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
Phys Chem Chem Phys. 2017 Jul 21;19(27):17521-17525. doi: 10.1039/c7cp03261g. Epub 2017 Jun 28.
The adsorption of phenyl hydroquinone (PHQ) on graphene surfaces at the liquid-solid interface is investigated revealing a flat orientation and two different vertically adsorbed states of PHQ on graphene nanoplatelets (GNPs), namely edgewise or endwise adsorption. The transition between these states is driven by increasing concentrations of PHQ in solution leading to increased absolute coverages on the graphene surface. At low adsorbate concentrations (≤21 mM), the adsorption process is also shown to be Langmuirian with an adsorption constant of (9.5 ± 0.2) mM. Independent measurements are conducted using a single particle electrochemical technique to confirm the surface coverage of PHQ on GNPs at low concentrations, showing excellent agreement with the UV-Vis studies.
研究了对苯二酚（PHQ）在液固界面石墨烯表面的吸附情况，结果表明PHQ在石墨烯纳米片（GNPs）上呈现平面取向以及两种不同的垂直吸附状态，即边缘吸附或端部吸附。这些状态之间的转变是由溶液中PHQ浓度的增加驱动的，导致石墨烯表面的绝对覆盖率增加。在低吸附质浓度（≤21 mM）下，吸附过程也表现为符合朗缪尔吸附等温线，吸附常数为（9.5 ± 0.2）mM。使用单粒子电化学技术进行了独立测量，以确认低浓度下PHQ在GNPs上的表面覆盖率，结果与紫外可见光谱研究结果非常吻合。
