Tunnelling conductance of vectorial porphyrin monolayers

Xi, Wang, Zhang, Wei, An, Byeong-Kwan, Burn, Paul L. and Davis, Jason J. (2008) Tunnelling conductance of vectorial porphyrin monolayers. Journal of Materials Chemistry, 18 26: 3109-3120. doi:10.1039/b802824a

Author Xi, Wang
Zhang, Wei
An, Byeong-Kwan
Burn, Paul L.
Davis, Jason J.
Title Tunnelling conductance of vectorial porphyrin monolayers
Journal name Journal of Materials Chemistry   Check publisher's open access policy
ISSN 0959-9428
Publication date 2008-07-14
Sub-type Article (original research)
DOI 10.1039/b802824a
Open Access Status Not Open Access
Volume 18
Issue 26
Start page 3109
End page 3120
Total pages 12
Place of publication Cambridge, U.K.
Publisher Royal Society of Chemistry
Collection year 2009
Language eng
Subject C1
030503 Organic Chemical Synthesis
030604 Electrochemistry
970103 Expanding Knowledge in the Chemical Sciences
Formatted abstract
A method for antipodal attachment of sulfur linkers to a nickel chelated porphyrin has been developed to facilitate robust chemisorption at goldelectrodes. At sufficiently high molecular coverage ellipsometric, infrared and electroanalytical data are supportive of a close-to-vertical molecular orientation with respect to the substrate. Molecular conductance was assessed both within neat porphyrin monolayer films and on individual molecules isolated within an ordered saturated alkyl thiol (1-tetradecanethiol) self-assembled monolayer and then capped with chemisorbed gold nanoparticles. In the former, three distinct groups of current–voltage (IV) curves were observed both by scanning tunnelling microscopy (STM) and conductive probeatomic force microscopy (CP-AFM), corresponding to the conductance of one, two, and three molecules, which were quantizable as integer multiples of a fundamental molecular conductance (1.37 ± 0.25 nS). This value compares well with that obtained on isolated molecules and is significantly higher than the host matrix. In all cases IV trends are well described by a non-resonant tunnelling model.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemistry and Molecular Biosciences
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Created: Mon, 09 Mar 2009, 14:15:33 EST by Jennifer Falknau on behalf of School of Chemistry & Molecular Biosciences