CHARACTERIZATION OF OCTADECYLTRICHLOROSILANE SELF-ASSEMBLED MULTILAYERS ON PYREX GLASS

In this paper, octadecyltrichlorosilane (OTS) self-assembled multilayer (SAM) films are fabricated on Pyrex glass by dipping method. The hydrophobicity, constituent and surface morphology of OTS SAM at various dipping times in solutions of 1, 2 and 5 mM concentrations are investigated. Characteristic absorption peaks around 2850 and 2920 cm(-1) are observed by FTIR and island-like structures on samples are detected by AFM. After 15 min dipping time for solution of 5 mM, water contact angle of the sample reaches the maximum value of 116.4 degrees with relatively low surface root mean square (Rms) roughness of 0.152 nm. The critical surface tension (gamma(c)) of the analyzed sample is 18.2 dyne/cm. The optimum dipping time in the solution of 5 mM for a complete SAM film is about 30 min. The study of the optimal conditions for the formation of integrated OTS SAM has significant scientific and practical values in modification of solid surfaces.