Document Detail

Measurement of the conductance of single conjugated molecules.
MedLine Citation:
PMID:  16079841     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Electrical conduction through molecules depends critically on the delocalization of the molecular electronic orbitals and their connection to the metallic contacts. Thiolated (- SH) conjugated organic molecules are therefore considered good candidates for molecular conductors: in such molecules, the orbitals are delocalized throughout the molecular backbone, with substantial weight on the sulphur-metal bonds. However, their relatively small size, typically approximately 1 nm, calls for innovative approaches to realize a functioning single-molecule device. Here we report an approach for contacting a single molecule, and use it to study the effect of localizing groups within a conjugated molecule on the electrical conduction. Our method is based on synthesizing a dimer structure, consisting of two colloidal gold particles connected by a dithiolated short organic molecule, and electrostatically trapping it between two metal electrodes. We study the electrical conduction through three short organic molecules: 4,4'-biphenyldithiol (BPD), a fully conjugated molecule; bis-(4-mercaptophenyl)-ether (BPE), in which the conjugation is broken at the centre by an oxygen atom; and 1,4-benzenedimethanethiol (BDMT), in which the conjugation is broken near the contacts by a methylene group. We find that the oxygen in BPE and the methylene groups in BDMT both suppress the electrical conduction relative to that in BPD.
Tali Dadosh; Yoav Gordin; Roman Krahne; Ilya Khivrich; Diana Mahalu; Veronica Frydman; Joseph Sperling; Amir Yacoby; Israel Bar-Joseph
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  436     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-08-04     Completed Date:  2005-08-22     Revised Date:  2005-09-09    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  677-80     Citation Subset:  -    
Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.
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Erratum In:
Nature. 2005 Aug 25;436(7054):1200

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