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In this study, a series of trifluoromethyl-terminated alkanethiols with different chain length (CF 3 (CH 2 ) n SH, n=5, 6, 10, 11, 12 and 13), were used to form self-assembled monolayers(SAMs) on silver and gold surfaces. The SAM modulates the metal work function as a result of the different orientation of the terminal dipolar CF 3 group due to different chain tilt...