Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00275 : Analysis of Self-Assembled Monolayers in Nanoscale Switching Elements
Author:
Molecular junctions consisting of gold and silver electrodes and a
self-assembled monolayer (SAM) have been shown to act as voltage-controlled
electrical two-state switches due to the electrochemical migration of silver
ions. In these junctions the SAM is sandwiched between the two metal
electrodes. When a certain bias voltage is applied across the metal
electrodes, atoms on the silver electrode surface are electrochemically
oxidized, and the resulting silver ions are drawn by the local electric
field toward the gold electrode. Upon deposition onto the gold electrode the
silver ions are reduced to silver atoms. As more silver atoms are deposited
onto the gold electrode, a metallic connection is formed between the
electrodes resulting in a closed-circuit state between the two electrodes.
The silver metallic bridges are metastable in these junctions, and they are
dissolved when the voltage between the electrodes is swept back toward zero
volts. When the silver filaments retract, the switch returns to an
open-circuit state. Varying the functional group of the SAMs induces
different switching characteristics in the junctions. We are analyzing the
transition voltages at which this switching occurs for different SAMs under
different temperature and humidity, and plotting the data to observe trends
in order to isolate the key factors involved in this switching.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.275
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