Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices

Erica DeIonno; Hsian Rong Tseng; Desmond D. Harvey; J. Fraser Stoddart; James R. Heath

doi:10.1021/jp0607723

Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices

Erica DeIonno, Hsian Rong Tseng, Desmond D. Harvey, J. Fraser Stoddart, James R. Heath^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

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Abstract

Langmuir-Blodgett monolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 Å²/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 Å²/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 Å²/molecule) exhibit nonspecific damage and poor switching behavior following Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.

Original language	English (US)
Pages (from-to)	7609-7612
Number of pages	4
Journal	Journal of Physical Chemistry B
Volume	110
Issue number	15
DOIs	https://doi.org/10.1021/jp0607723
State	Published - Apr 20 2006

ASJC Scopus subject areas

Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical Chemistry

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title = "Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices",

abstract = "Langmuir-Blodgett monolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 {\AA}2/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 {\AA}2/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 {\AA}2/molecule) exhibit nonspecific damage and poor switching behavior following Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.",

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T1 - Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices

AU - DeIonno, Erica

AU - Tseng, Hsian Rong

AU - Harvey, Desmond D.

AU - Stoddart, J. Fraser

AU - Heath, James R.

PY - 2006/4/20

Y1 - 2006/4/20

N2 - Langmuir-Blodgett monolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 Å2/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 Å2/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 Å2/molecule) exhibit nonspecific damage and poor switching behavior following Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.

AB - Langmuir-Blodgett monolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 Å2/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 Å2/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 Å2/molecule) exhibit nonspecific damage and poor switching behavior following Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.

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Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices

Abstract

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