Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s

Xiaoyin Xiao; Larry A. Nagahara; Adam M. Rawlett; Nongjian Tao

doi:10.1021/ja050381m

Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s

Xiaoyin Xiao, Larry A. Nagahara, Adam M. Rawlett, Nongjian Tao

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242 Scopus citations

Abstract

We have studied electron transport properties of unsubstituted oligo(phenylene ethynylene) (OPE) (1) and nitro-substituted OPE (2) covalently bound to two gold electrodes. The conductance values of single 1 and 2 are ∼13 and ∼6 nS, respectively. In addition to a decrease in the conductance, the presence of the nitro moiety leads to asymmetric I-V characteristics and a negative differential resistance-like (NDR-like) behavior. We have altered the nitro-substituted OPE by electrochemically reducing the nitro group and by varying the pH of the electrolyte. The conductance decreases linearly with the electron-withdrawing capability (i.e., Hammett substituent values) of the corresponding reduced species. In contrast, the conductance of 1 is independent of the pH and the electrode potential.

Original language	English (US)
Pages (from-to)	9235-9240
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	127
Issue number	25
DOIs	https://doi.org/10.1021/ja050381m
State	Published - Jun 29 2005

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s",

abstract = "We have studied electron transport properties of unsubstituted oligo(phenylene ethynylene) (OPE) (1) and nitro-substituted OPE (2) covalently bound to two gold electrodes. The conductance values of single 1 and 2 are ∼13 and ∼6 nS, respectively. In addition to a decrease in the conductance, the presence of the nitro moiety leads to asymmetric I-V characteristics and a negative differential resistance-like (NDR-like) behavior. We have altered the nitro-substituted OPE by electrochemically reducing the nitro group and by varying the pH of the electrolyte. The conductance decreases linearly with the electron-withdrawing capability (i.e., Hammett substituent values) of the corresponding reduced species. In contrast, the conductance of 1 is independent of the pH and the electrode potential.",

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T1 - Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s

AU - Xiao, Xiaoyin

AU - Nagahara, Larry A.

AU - Rawlett, Adam M.

AU - Tao, Nongjian

PY - 2005/6/29

Y1 - 2005/6/29

N2 - We have studied electron transport properties of unsubstituted oligo(phenylene ethynylene) (OPE) (1) and nitro-substituted OPE (2) covalently bound to two gold electrodes. The conductance values of single 1 and 2 are ∼13 and ∼6 nS, respectively. In addition to a decrease in the conductance, the presence of the nitro moiety leads to asymmetric I-V characteristics and a negative differential resistance-like (NDR-like) behavior. We have altered the nitro-substituted OPE by electrochemically reducing the nitro group and by varying the pH of the electrolyte. The conductance decreases linearly with the electron-withdrawing capability (i.e., Hammett substituent values) of the corresponding reduced species. In contrast, the conductance of 1 is independent of the pH and the electrode potential.

AB - We have studied electron transport properties of unsubstituted oligo(phenylene ethynylene) (OPE) (1) and nitro-substituted OPE (2) covalently bound to two gold electrodes. The conductance values of single 1 and 2 are ∼13 and ∼6 nS, respectively. In addition to a decrease in the conductance, the presence of the nitro moiety leads to asymmetric I-V characteristics and a negative differential resistance-like (NDR-like) behavior. We have altered the nitro-substituted OPE by electrochemically reducing the nitro group and by varying the pH of the electrolyte. The conductance decreases linearly with the electron-withdrawing capability (i.e., Hammett substituent values) of the corresponding reduced species. In contrast, the conductance of 1 is independent of the pH and the electrode potential.

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Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s

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