Adsorption kinetics of organ-ophosphonic acids on plasma-modified oxide-covered aluminum surfaces
Adsorption kinetics of organ-ophosphonic acids on plasma-modified oxide-covered aluminum surfaces
复制标题
DOI：
10.1021/la8000619
复制
发表时间：
2008-08-19
期刊：
影响因子：
3.9
通讯作者：
Grundmeier, G.
中科院分区：
文献类型：
--
作者：
Giza, M.;Thissen, P.;Grundmeier, G.
采用低压水和Ar等离子体对铝表面进行氧化化学修饰，以影响十八烷基膦酸单分子膜自组装过程的动力学。用原位傅里叶变换红外反射吸收光谱(IRRAS)研究了等离子体诱导的表面化学。采用非原位红外光谱和X射线光电子能谱对吸附的自组装单分子膜进行了分析。用石英晶体微天平测定，等离子体引起的氢氧化物比的变化导致了稀乙醇溶液中磷酸的不同吸附动力学。与经Ar等离子体处理的表面相比，水等离子体处理后的表面羟基密度显著增加。富含羟基的表面显著加快了磷酸的吸附动力学，形成单层的时间不到1min。相反，降低表面羟基密度会减缓吸附动力学。
Tailoring of oxide chemistry on aluminum by means of low-pressure water and argon plasma surface modification was performed to influence the kinetics of the self-assembly process of octadecylphosphonic acid monolayers. The plasma-induced surface chemistry was studied by in situ FTIR reflection-absorption spectroscopy (IRRAS). Ex situ IRRAS and X-ray photoelectron spectroscopy were applied for the analysis of the adsorbed self-assembled monolayers. The plasma-induced variation of the hydroxide to oxide ratio led to different adsorption kinetics of the phosphonic acid from dilute ethanol solutions as measured by means of a quartz crystal microbalance. Water plasma treatment caused a significant increase in the density of surface hydroxyl groups in comparison to that of the argon-plasma-treated surface. The hydroxyl-rich surface led to significantly accelerated adsorption kinetics of the phosphonic acid with a time of monolayer formation of less than 1 min. On the contrary, decreasing the surface hydroxyl density slowed the adsorption kinetics.