Abstract

We have demonstrated that indium tin oxide (ITO) can be used as contact electrodes to form molecular junctions via ITO-carboxylic acid bonds. We measured the conductance of n -alkane terminated with dicarboxylic acids using conducting atomic force microscope break junction. The conductance decreases exponentially with molecular length with a decay constant of ∼0.80 Å-1, which is similar to that of Au-carboxylic acid junctions. However, the contact conductance of ITO-carboxylic acid is smaller than that of Au-carboxylic acid, reflecting different electronic couplings between the linker group and electrodes. From the average breakdown force and stretching length, we estimated the binding energy of ITO-carboxylic acid.

Original languageEnglish (US)
Article number162106
JournalApplied Physics Letters
Volume91
Issue number16
DOIs
StatePublished - 2007

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carboxylic acids
indium oxides
tin oxides
electrodes
dicarboxylic acids
alkanes
breakdown
binding energy
microscopes
conduction
decay
electronics

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Forming single molecular junctions between indium tin oxide electrodes. / Chen, Fang; Huang, Zhifeng; Tao, Nongjian.

In: Applied Physics Letters, Vol. 91, No. 16, 162106, 2007.

Research output: Contribution to journalArticle

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AB - We have demonstrated that indium tin oxide (ITO) can be used as contact electrodes to form molecular junctions via ITO-carboxylic acid bonds. We measured the conductance of n -alkane terminated with dicarboxylic acids using conducting atomic force microscope break junction. The conductance decreases exponentially with molecular length with a decay constant of ∼0.80 Å-1, which is similar to that of Au-carboxylic acid junctions. However, the contact conductance of ITO-carboxylic acid is smaller than that of Au-carboxylic acid, reflecting different electronic couplings between the linker group and electrodes. From the average breakdown force and stretching length, we estimated the binding energy of ITO-carboxylic acid.

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