A surface charge induced order-disorder phase transition in organic monolayers
Document Type
Thesis
Degree
Master of Science (MS)
Major/Program
Physics
First Advisor's Name
Nongjian Tao
First Advisor's Committee Title
Committee Chair
Second Advisor's Name
Xuewen Wang
Third Advisor's Name
Yesim Darici
Fourth Advisor's Name
Mark Hagmann
Date of Defense
11-9-1995
Abstract
Adenine and 2-2' bipyridine monolayer films adsorbed on Au (111) have been studied by Scanning Tunneling Microscopy (STM) in solution as a function of surface charge and bulk concentration. Both molecules form polymer chains. The length of the polymer chains increases as the concentration increases. At low charges they are randomly oriented, but they begin to align in parallel as the charge density reaches a critical value. The transition, which resembles the isotropic-nematic phase transition encountered in liquid-crystals, is fully reversible by lowering the charge below the critical value.
Identifier
FI14061566
Recommended Citation
Cunha, Frederico, "A surface charge induced order-disorder phase transition in organic monolayers" (1995). FIU Electronic Theses and Dissertations. 2690.
https://digitalcommons.fiu.edu/etd/2690
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