The anomalous "stiffness" of biphenydimethyldithiol

Authors

• D.Q. Feng, University of Nebraska-LincolnFollow
• Peter A. Dowben, University of Nebraska-LincolnFollow
• R. Rajesh, University of Nebraska-Lincoln
• Jody G. Redepenning, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

5-2-2005

Comments

Published Applied Physics Letters 87 (2005) 181918. Permission to use.

Abstract

Although organic adsorbates and thin films are generally regarded as "soft" materials, the effective Debye temperature, indicative of the dynamic motion of lattice normal to the surface, can be very high. For biphenyldimethyldithiol, the effective Debye temperature, determined from core level photoemission from the all carbon arene rings, is comparable to that of graphite. We associate this rigidity to the stiffness of the benzene rings, and the ordering in the molecular thin film. Measurements on the sulfur of poly(hexylthiophene) show that sulfur in an arene ring is less dominated by soft modes than the pendant sulfur of biphenyldimethyldithiol on the time scale of photoemission. ©2005 American Institute of Physics