Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy

Reynolds, S.; Peasgood, A; Oxley, David; Pritchard, R. G.; Walmsley, D.G.; Tomlin, J.L.; Turner, Robert

doi:10.1088/0022-3719/20/27/009

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…This table brings together the work of two other groups. KH [6,7] investigated the effect on the position of the O H peak at 450 mV of using metals other than lead as a top electrode under forward-bias conditions and Reynolds and co-workers [5], revealed a small, polarity-dependent shift on the position of the 144 mV peak in the benzoate spectrum using a lead top electrode, this result being in agreement with similar work on OH at 450 mV by Adkins and Sleigh [4].…”

Section: Top-metal and Polarity Effects In Undoped Junctionssupporting

confidence: 70%

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions

Line¹,

Pritchard²,

Oxley³

1989

J. Phys.: Condens. Matter

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The shift in position on bias reversal of the 450 meV OH mode in tunnel junctions comprised of aluminium/aluminium oxide/M where M is Pb, Ag and Sn is investigated using inelastic electron tunnelling spectroscopy. Measurements presented here reveal that the peak shift is independent of M within the experimental error of this work. This is consistent with a simple superposition of the three electric fields acting on the hydroxyl group due to the tunnel barrier, the image charge and the external bias respectively. The implication is that as far as the subtle effect of peak shifts on reverse bias is concerned, the tunnel junction environment of the adsorbed species is essentially benign. For certain electrode thicknesses and geometries, peak shifts can arise due to finite electrode resistance even when four-point probe conditions pertain. A simple procedure for treating these is presented.

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Section: Top-metal and Polarity Effects In Undoped Junctionssupporting

confidence: 70%

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions

Line¹,

Pritchard²,

Oxley³

1989

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

show abstract

“…[6,7] investigated the effect on the position of the O H peak at 450 mV of using metals other than lead as a top electrode under forward-bias conditions and Reynolds and co-workers [5], revealed a small, polarity-dependent shift on the position of the 144 mV peak in the benzoate spectrum using a lead top electrode, this result being in agreement with similar work on OH at 450 mV by Adkins and Sleigh [4].…”

Section: Resistive Errorssupporting

confidence: 83%

“…As IETS has progressed and measurements have been refined to the current level (mode energies can now be reproducably measured to within k0.03 meV in 150 meV), subtle effects have emerged. Recent work [5] has highlighted the role of the electric field within the junction, suggesting that it interacts via anharmonic effects to perturb the vibrational frequencies of adsorbed molecules. Other workers have examined the effect of image charges in the metal electrodes of the junction on peak positions [3] and significant peak shifts due to the nature of the metal in the top electrodes have also been 0953-8984/89/386835 + 08 $02.50 @ 1989 IOP Publishing Ltd reported [&SI.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Ribbonlike Carbon Films

Matsumura¹,

Wang

Shinohara

et al. 1995

Jpn. J. Appl. Phys.

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The shift in position on bias reversal of the 450 meV OH mode in tunnel junctions comprised of aluminium/aluminium oxide/M where M is Pb, Ag and Sn is investigated using inelastic electron tunnelling spectroscopy.Measurements presented here reveal that the peak shift is independent of M within the experimental error of this work. This is consistent with a simple superposition of the three electric fields acting on the hydroxyl group due to the tunnel barrier, the image charge and the external bias respectively. The implication is that as far as the subtle effect of peak shifts on reverse bias is concerned, the tunnel junction environment of the adsorbed species is essentially benign.For certain electrode thicknesses and geometries, peak shifts can arise due to finite electrode resistance even when four-point probe conditions pertain. A simple procedure for treating these is presented.

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Study of a zinc chloride in poly(ethylene glycol) layer on an aluminium oxide surface by inelastic electron tunneling spectroscopy

Line

Pritchard

Pynenburg

et al. 1995

Surface & Interface Analysis

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Inelastic electron tunneling spectroscopy is used to compare the adsorption onto aluminium oxide of poly(ethy1ene glycol) of relative molar mass 400 (PEG,,,) with poly(ethy1ene glycol) that has been coordinated with zinc chloride. This work carried out on a low-molecular-weight analogue of a polymer electrolyte reveals that the steric hinderance brought about by the coordination of zinc chloride with poly(ethy1ene glycol) changes the mechanism by which the polymer bonds to an aluminium oxide surface. The zinc bonds both to atmospheric water and to the ether oxygens in the polymer, which restricts the conformational freedom of the polymer. This restriction causes the attachment of the polymer to the aluminium oxide substrate to be primarily by hydrogen bonding, which reveals itself through the appearance of an extra peak in the inelastic electron tunneling spectrum at -440 meV. The implication is that when monolayer coatings of PEG,,,/ZnCl, are adsorbed on aluminium oxide, the Coordination of the zinc with the polymer imposes a structure upon the latter.

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Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy

Cited by 5 publications

References 18 publications

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions

Thermal Conductivity of Ribbonlike Carbon Films

Study of a zinc chloride in poly(ethylene glycol) layer on an aluminium oxide surface by inelastic electron tunneling spectroscopy

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Bias polarity-dependent changes in vibrational mode energy in inelastic electron tunnelling spectroscopy

Cited by 5 publications

References 18 publications

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlOx-metal tunnel junctions

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlOx-metal tunnel junctions

Thermal Conductivity of Ribbonlike Carbon Films

Study of a zinc chloride in poly(ethylene glycol) layer on an aluminium oxide surface by inelastic electron tunneling spectroscopy

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Product

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Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions

Bias-polarity-dependent effects on the OH vibrational mode energy in Al-AlO_x-metal tunnel junctions