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Charge transport in nitro substitute...

Cabassi, Marco Alberto.

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Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules./
Author:	Cabassi, Marco Alberto.
Description:	152 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3256.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266080
ISBN:	9780549044420

Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules.
Cabassi, Marco Alberto.

Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules. - 152 p.

Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3256.

Thesis (Ph.D.)--The Pennsylvania State University, 2007.

This thesis presents research aimed at tackling two issues in the field of molecular electronics. The first issue is the large range of molecular conductance values reported by various research groups for identical molecules. This is addressed by studying the same molecule in dissimilar environments. The second issue is experimental uncertainty---whether the observed effects are inherent to the molecule or due to external causes. This is addressed by performing in-situ spectroscopy of the molecule as part of its electrical characterization.

ISBN: 9780549044420Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules.
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020 $a 9780549044420
035 $a (UMI)AAI3266080
035 $a AAI3266080
040 $a UMI $c UMI
100 1 $a Cabassi, Marco Alberto. $3 1285435
245 1 0 $a Charge transport in nitro substituted oligo(phenylene-ethynylene) molecules.
300 $a 152 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3256.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2007.
520 $a This thesis presents research aimed at tackling two issues in the field of molecular electronics. The first issue is the large range of molecular conductance values reported by various research groups for identical molecules. This is addressed by studying the same molecule in dissimilar environments. The second issue is experimental uncertainty---whether the observed effects are inherent to the molecule or due to external causes. This is addressed by performing in-situ spectroscopy of the molecule as part of its electrical characterization.
520 $a Oligo(phenylene-ethynylene)s are a well studied class of molecules in the field of molecular electronics, and this work focuses on charge transport through nitro substituted oligo(phenylene-ethynylene) molecules. The electrical characterization of these molecules was performed utilizing two testbeds. An electromigrated break-junction testbed was used to probe individual molecules, while a nanowire molecular junction testbed was used to probe self-assembled monolayers of the molecule.
520 $a Experiments performed on individual molecules revealed a temperature dependent transition in the dominant charge transport mechanism. Above 50K, hopping is the dominant charge transport mechanism, while below 50K direct tunneling is the dominant charge transport mechanism. Experiments performed on self-assembled monolayers did not reveal any temperature dependent transitions. The dominant charge transport mechanism appears to be direct tunneling throughout the temperature range investigated.
520 $a The results also indicate that molecules embedded in a self-assembled monolayer have significantly lower conductance than individual molecules. This is primarily due to a second charge transport mechanism (hopping) that opens up above 50K that is available only to individual molecules, and secondarily due to better potential screening properties of the self-assembled monolayers. Inelastic electron tunneling spectra obtained for the molecules in a self-assembled monolayer show a characteristic three-peak structure. Each of the peaks can be associated with a specific vibrational mode of an oligo(phenylene-ethynylene) molecule.
520 $a The results presented here directly address two issues in the field of molecular electronics. Firstly, the discrepancy in the reported molecular conductance values was addressed by establishing the important role played by the molecular environment in determining molecular conductance. Secondly, confidence in the results was established by obtaining an in-situ inelastic tunneling spectrum of the molecule under study.
590 $a School code: 0176.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Molecular. $3 1018648
690 $a 0544
690 $a 0609
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 68-05B.
790 $a 0176
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266080