Electron tunneling through a self-adsorbed monolayer of fatty acids on Al/AlOx substrate

Serge Gauvin, Roger Leblanc

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Electron tunneling through saturated fatty acids acids sandwiched between metallic electrodes was studied. The components of the junction were Al/AlOx/Cn/Pb, where Cn is a fatty acid self-adsorbed monomolecular film containing n carbon atoms (n = 6, ..., 24). Our investigation is original compared to previous work because the quality parameter (Q) was defined to ascertain that electron tunneling is the dominating conduction mechanism between the electrodes. Our results indicate that for n > 10, electron tunneling dominates only if metallic paths are present through the monolayer. Moreover, the conductivity for monolayers with n > 10, without metallic paths is independent of electrode spacing. Thus, bulk conduction mechanisms through fatty acid self-adsorbed monolayers with n > 10 are not dominated by electron tunneling. By extrapolation to Q = 0, the maximum aluminium oxide thickness through which tunneling can be detected is estimated to be 66 ± 12 Å. Inelastic electron tunneling spectroscopic investigations suggest that short chain fatty acid self-adsorbed monolayers are disorderd whereas for long chain molecules, the attractive intermolecular interaction CH2···CH2 is large, leading to the formation of highly ordered monolayers.

Original languageEnglish
Pages (from-to)508-511
Number of pages4
JournalThin Solid Films
Volume210-211
Issue numberPART 2
DOIs
StatePublished - Apr 30 1992
Externally publishedYes

Fingerprint

Electron tunneling
fatty acids
electron tunneling
Fatty acids
Monolayers
Fatty Acids
Substrates
electrodes
Electrodes
conduction
monomolecular films
Saturated fatty acids
Volatile Fatty Acids
Aluminum Oxide
extrapolation
Extrapolation
aluminum oxides
spacing
Carbon
conductivity

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Electron tunneling through a self-adsorbed monolayer of fatty acids on Al/AlOx substrate. / Gauvin, Serge; Leblanc, Roger.

In: Thin Solid Films, Vol. 210-211, No. PART 2, 30.04.1992, p. 508-511.

Research output: Contribution to journalArticle

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abstract = "Electron tunneling through saturated fatty acids acids sandwiched between metallic electrodes was studied. The components of the junction were Al/AlOx/Cn/Pb, where Cn is a fatty acid self-adsorbed monomolecular film containing n carbon atoms (n = 6, ..., 24). Our investigation is original compared to previous work because the quality parameter (Q) was defined to ascertain that electron tunneling is the dominating conduction mechanism between the electrodes. Our results indicate that for n > 10, electron tunneling dominates only if metallic paths are present through the monolayer. Moreover, the conductivity for monolayers with n > 10, without metallic paths is independent of electrode spacing. Thus, bulk conduction mechanisms through fatty acid self-adsorbed monolayers with n > 10 are not dominated by electron tunneling. By extrapolation to Q = 0, the maximum aluminium oxide thickness through which tunneling can be detected is estimated to be 66 ± 12 {\AA}. Inelastic electron tunneling spectroscopic investigations suggest that short chain fatty acid self-adsorbed monolayers are disorderd whereas for long chain molecules, the attractive intermolecular interaction CH2···CH2 is large, leading to the formation of highly ordered monolayers.",
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N2 - Electron tunneling through saturated fatty acids acids sandwiched between metallic electrodes was studied. The components of the junction were Al/AlOx/Cn/Pb, where Cn is a fatty acid self-adsorbed monomolecular film containing n carbon atoms (n = 6, ..., 24). Our investigation is original compared to previous work because the quality parameter (Q) was defined to ascertain that electron tunneling is the dominating conduction mechanism between the electrodes. Our results indicate that for n > 10, electron tunneling dominates only if metallic paths are present through the monolayer. Moreover, the conductivity for monolayers with n > 10, without metallic paths is independent of electrode spacing. Thus, bulk conduction mechanisms through fatty acid self-adsorbed monolayers with n > 10 are not dominated by electron tunneling. By extrapolation to Q = 0, the maximum aluminium oxide thickness through which tunneling can be detected is estimated to be 66 ± 12 Å. Inelastic electron tunneling spectroscopic investigations suggest that short chain fatty acid self-adsorbed monolayers are disorderd whereas for long chain molecules, the attractive intermolecular interaction CH2···CH2 is large, leading to the formation of highly ordered monolayers.

AB - Electron tunneling through saturated fatty acids acids sandwiched between metallic electrodes was studied. The components of the junction were Al/AlOx/Cn/Pb, where Cn is a fatty acid self-adsorbed monomolecular film containing n carbon atoms (n = 6, ..., 24). Our investigation is original compared to previous work because the quality parameter (Q) was defined to ascertain that electron tunneling is the dominating conduction mechanism between the electrodes. Our results indicate that for n > 10, electron tunneling dominates only if metallic paths are present through the monolayer. Moreover, the conductivity for monolayers with n > 10, without metallic paths is independent of electrode spacing. Thus, bulk conduction mechanisms through fatty acid self-adsorbed monolayers with n > 10 are not dominated by electron tunneling. By extrapolation to Q = 0, the maximum aluminium oxide thickness through which tunneling can be detected is estimated to be 66 ± 12 Å. Inelastic electron tunneling spectroscopic investigations suggest that short chain fatty acid self-adsorbed monolayers are disorderd whereas for long chain molecules, the attractive intermolecular interaction CH2···CH2 is large, leading to the formation of highly ordered monolayers.

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