配体对功能自组装薄膜的光致电子转移特性的影响

0 Introduction The strategy for fabrication of functionalized self- assembled films has been developing rapidly in recent years. Fujihara and his coworkers[1,2] first reported the dehydrative coupling of a carboxyl group of rhodamine B with a surface hydroxyl group to form a presumed ester linkage. Sustained photocurrents from ester- linked tin oxide electrodes were 2 orders of magnitude higher than those obtained from amide-linked silane- pretreated tin oxide surfaces. Soon after, Goodenough…

Effects of Connecting Ligands on Photoinduced Electron Transfer Properties of Functionalized Self-assembled Solid Films

A strategy for fabricating the functionalized self-assembled films is proposed. Through the comparison of three self-assembled films of 3,4,9,10-perylene tetracarboxylic acid (PTA) with different connecting ligands, i.e. oxalic acid (Ox), succinic acid (Su), or terephthalic acid (Tp), it was found that the optimal system was composed of oxalic acid, Ce⁴⁺ and 3,4,9,10-perylene tetracarboxylic acid,which was much better than simple covalent connecting PTA films and the connecting ligands played an important role for the properties of self-assembled (SA) films. All these films were characterized by contact angle, UV spectra, cyclic voltammetry and XPS. The photocurrent generation of the best system were 5 706, 7 345 nA·cm^-2, respectively, being among the highest values of dye-sensitized indium tin oxide (ITO) systems. The effects of light intensity, bias voltage, and electron donor on photoinduced electron transfer properties were also studied. The possible mechanism of electron transfer is proposed.