Title

A surface charge induced order-disorder phase transition in organic monolayers

Document Type

Thesis

Degree

Master of Science (MS)

Department

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

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