the National Key Basic Research Program of China (973)(2013CB733503);National Natural Science Foundation of China(21490581);Project of Priority Academic Program Development of Jiangsu Higher Education Institutions, China(PAPD)
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China
Abstract:
In this work, 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS) self-assembled monolayers (SAMs) were prepared using liquid-phase deposition. To prepare the FDTS SAMs, the FDTS solution was first hydrolyzed for 15 min at room temperature, and then mica was immersed into the FDTS solution for self-assembly for 30 min. It was confirmed that the new method can effectively prevent aggregation of FDTS in the liquid phase deposition using atomic force microscopy (AFM). The FDTS SAMs were successfully prepared with a high surface coverage of (85% ± 2%) and low root mean square surface roughness (0.58 nm). The growth process of the SAMs can be described using the Langmuir first-order adsorption kinetics model. However, if hydrolysis and assembly occur at the same time and these processes last more than 30 min, the FDTS would be aggregated in the liquid-phase deposition process, which would greatly reduce the quality of the SAMs.
