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Rapid Time Domain Molecular Conductance Measurement of Alkanedithiols Using STM

Published online by Cambridge University Press:  14 July 2014

James Ma ,
Shuai Chang  and
Roger Howe
James Ma
Affiliation:
Stanford University, Palo Alto, CA
Shuai Chang
Affiliation:
Stanford University, Palo Alto, CA
Roger Howe
Affiliation:
Stanford University, Palo Alto, CA
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Abstract

Molecules such as dithiols are of significant interest for potential molecular electronics applications. To investigate their properties, an efficient method for measuring their electrical conductance is crucial. This research focuses on the time domain measurement, a novel technique capable of measuring hundreds of molecules within a matter of seconds. Measurements were conducted using STM with the tip positioned within tunneling distance over a SAM of 1,8-octanedithiol on Au(111)-mica substrate submerged in toluene. Bonding/debonding events between the tops of molecules and the tip were observed through jumps in the time domain current waveform. A new time-spent histogram data analysis technique was developed to extract conductance values from complex waveforms. Conductance of 2.6 nS was obtained for a single 1,8-octanedithiol molecule, consistent with results obtained from wellestablished but time consuming break junction technique, validating the new STM based time domain technique for fast measurement of molecular conductance.

Keywords

scanning tunneling microscopy (STM)Pdelectrical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1712: Symposium ZZ/AAA/BBB – Recent Advances in the Structural Characterization of Materials , 2014 , mrss14-1712-bbb09-04
Copyright
Copyright © Materials Research Society 2014 

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References

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