Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany.
Phys Chem Chem Phys. 2012 Apr 14;14(14):4703-12. doi: 10.1039/c2cp40072c. Epub 2012 Feb 29.
Palladium nanoparticles have been deposited electrochemically onto self-assembled monolayers (SAMs) of 4-(4-(4-pyridyl)phenyl)phenylmethanethiol. A pronounced correlation between the kinetics of the complexation between pyridine nitrogens and Pd cations and the sample potential has been observed. The amount of the Pd deposit significantly increases by adjusting the sample potential during the complexation step to values below the point of zero charge. The size of the spherical shaped Pd nanoparticles varies within a certain limit according to the amount of Pd(2+) ions initially coordinated on top of the SAM. The metallic state of these particles was confirmed by X-ray photoelectron spectroscopy and infrared reflection-absorption spectroscopy. Moreover, CO adsorption on the clean Pd deposit revealed further information about the crystallographic orientation of the nanoparticles.
钯纳米粒子已通过电化学沉积在 4-(4-(4-吡啶基)苯基)苯甲硫醇的自组装单层 (SAM) 上。观察到吡啶氮和 Pd 阳离子与样品电势之间的络合动力学之间存在明显的相关性。通过在络合步骤期间将样品电势调节至低于零电荷点的值，可以显著增加 Pd 沉积物的量。根据最初在 SAM 顶部配位的 Pd(2+)离子的量，球形 Pd 纳米粒子的尺寸在一定范围内变化。这些粒子的金属态通过 X 射线光电子能谱和红外反射吸收光谱得到证实。此外，在清洁的 Pd 沉积物上吸附 CO 揭示了有关纳米粒子的结晶取向的更多信息。
