Electron-induced dynamics of heptathioeter ß-cyclodextrin molecules

Avijit Kumar, Rene Heimbuch, K.S. Wimbush, H. Atesci, Adil Acun, David Reinhoudt, Aldrik Velders, Henricus J.W. Zandvliet

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Variable-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are performed on heptathioether β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) on Au. The β-CD molecules exhibit very rich dynamical behavior, which is not apparent in ensemble-averaged studies. The dynamics are reflected in the tunneling current–time traces, which are recorded with the STM feedback loop disabled. The dynamics are temperature independent, but increase with increasing tunneling current and sample bias, thus indicating that the conformational changes of the β-CD molecules are induced by electrons that tunnel inelastically. Even for sample biases as low as 10 mV, well-defined levels are observed in the tunneling current–time traces. These jumps are attributed to the excitations of the molecular vibration of the macrocyclic β-CD molecule. The results are of great importance for a proper understanding of transport measurements in SAMs.
Original languageEnglish
Pages (from-to)317-322
Number of pages6
JournalSmall
Volume8
Issue number2
DOIs
Publication statusPublished - 2012

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Scanning Tunnelling Microscopy
Cyclodextrins
Scanning tunneling microscopy
Self assembled monolayers
Electrons
Molecules
Temperature
Vibration
Molecular vibrations
Spectrum Analysis
Tunnels
Spectroscopy
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Keywords

  • IR-84668
  • METIS-286053

Cite this

Kumar, Avijit ; Heimbuch, Rene ; Wimbush, K.S. ; Atesci, H. ; Acun, Adil ; Reinhoudt, David ; Velders, Aldrik ; Zandvliet, Henricus J.W. / Electron-induced dynamics of heptathioeter ß-cyclodextrin molecules. In: Small. 2012 ; Vol. 8, No. 2. pp. 317-322.
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abstract = "Variable-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are performed on heptathioether β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) on Au. The β-CD molecules exhibit very rich dynamical behavior, which is not apparent in ensemble-averaged studies. The dynamics are reflected in the tunneling current–time traces, which are recorded with the STM feedback loop disabled. The dynamics are temperature independent, but increase with increasing tunneling current and sample bias, thus indicating that the conformational changes of the β-CD molecules are induced by electrons that tunnel inelastically. Even for sample biases as low as 10 mV, well-defined levels are observed in the tunneling current–time traces. These jumps are attributed to the excitations of the molecular vibration of the macrocyclic β-CD molecule. The results are of great importance for a proper understanding of transport measurements in SAMs.",
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Electron-induced dynamics of heptathioeter ß-cyclodextrin molecules. / Kumar, Avijit; Heimbuch, Rene; Wimbush, K.S.; Atesci, H.; Acun, Adil; Reinhoudt, David; Velders, Aldrik; Zandvliet, Henricus J.W.

In: Small, Vol. 8, No. 2, 2012, p. 317-322.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Electron-induced dynamics of heptathioeter ß-cyclodextrin molecules

AU - Kumar, Avijit

AU - Heimbuch, Rene

AU - Wimbush, K.S.

AU - Atesci, H.

AU - Acun, Adil

AU - Reinhoudt, David

AU - Velders, Aldrik

AU - Zandvliet, Henricus J.W.

PY - 2012

Y1 - 2012

N2 - Variable-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are performed on heptathioether β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) on Au. The β-CD molecules exhibit very rich dynamical behavior, which is not apparent in ensemble-averaged studies. The dynamics are reflected in the tunneling current–time traces, which are recorded with the STM feedback loop disabled. The dynamics are temperature independent, but increase with increasing tunneling current and sample bias, thus indicating that the conformational changes of the β-CD molecules are induced by electrons that tunnel inelastically. Even for sample biases as low as 10 mV, well-defined levels are observed in the tunneling current–time traces. These jumps are attributed to the excitations of the molecular vibration of the macrocyclic β-CD molecule. The results are of great importance for a proper understanding of transport measurements in SAMs.

AB - Variable-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are performed on heptathioether β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) on Au. The β-CD molecules exhibit very rich dynamical behavior, which is not apparent in ensemble-averaged studies. The dynamics are reflected in the tunneling current–time traces, which are recorded with the STM feedback loop disabled. The dynamics are temperature independent, but increase with increasing tunneling current and sample bias, thus indicating that the conformational changes of the β-CD molecules are induced by electrons that tunnel inelastically. Even for sample biases as low as 10 mV, well-defined levels are observed in the tunneling current–time traces. These jumps are attributed to the excitations of the molecular vibration of the macrocyclic β-CD molecule. The results are of great importance for a proper understanding of transport measurements in SAMs.

KW - IR-84668

KW - METIS-286053

U2 - 10.1002/smll.201101484

DO - 10.1002/smll.201101484

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VL - 8

SP - 317

EP - 322

JO - Small

JF - Small

SN - 1613-6810

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