Huang Y, Zhao Y, Gan L, Huang CH, Wu N
State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871, China
J Colloid Interface Sci. 1998 Aug 15;204(2):277-83. doi: 10.1006/jcis.1997.5406.
The Langmuir films of a fullerene dicarboxylic acid derivative I, C60(HOOCCHNH2CHCOOH)CF3SO3H (FDA), at the air/water interface have been investigated. FDA formed a stable monolayer on pure water when dilute solution (1.04 x 10(-5) mol/L) was used as the spreading solution. The monolayer formation on various subphases was investigated, including solutions containing different monovalent (Na+, Ag+) and divalent (Ca2+, Cd2+, Cu2+) cations. The introduction of these cations makes the monolayer more stable. The limiting molecular area is also dependent on the pH of the subphase. The surface pressure versus area isotherms at different temperature clearly indicate that FDA molecules easily aggregate at high temperature. The monolayer and multilayer LB films of FDA were deposited on quartz and glass substrates from Ca2+, Cd2+, Cu2+, or Cu2+/Phen solution subphase, and their UV-vis and XPS spectra were obtained. The data showed that for Cd2+ and Cu2+/Phen subphase the cation can be transferred onto the substrates together with FDA but not the other two. The photoelectrochemical behavior of FDA on an ITO electrode was investigated, which showed that the photocurrent is cathodic. Oxygen and negative bias are beneficial factors for the photocurrent generation. The external quantum yield is ca. 4%. Copyright 1998 Academic Press.
对富勒烯二羧酸衍生物I，即C60(HOOCCHNH2CHCOOH)CF3SO3H（FDA）在空气/水界面的朗缪尔膜进行了研究。当使用稀溶液（1.04×10⁻⁵mol/L）作为铺展溶液时，FDA在纯水上形成了稳定的单分子层。研究了在各种亚相上的单分子层形成情况，包括含有不同单价（Na⁺、Ag⁺）和二价（Ca²⁺、Cd²⁺、Cu²⁺）阳离子的溶液。这些阳离子的引入使单分子层更稳定。极限分子面积也取决于亚相的pH值。不同温度下的表面压力-面积等温线清楚地表明，FDA分子在高温下容易聚集。FDA的单分子层和多层LB膜从Ca²⁺、Cd²⁺、Cu²⁺或Cu²⁺/Phen溶液亚相沉积在石英和玻璃基板上，并获得了它们的紫外-可见光谱和X射线光电子能谱。数据表明，对于Cd²⁺和Cu²⁺/Phen亚相，阳离子可以与FDA一起转移到基板上，但其他两种情况则不然。研究了FDA在ITO电极上的光电化学行为，结果表明光电流是阴极电流。氧气和负偏压是产生光电流的有利因素。外量子产率约为4%。版权所有1998年学术出版社。
