Single molecular conductance measurements of molecular junction of Au/1,4-phenylenediamine/Au

Tobita, Junichi; Kato, Yoshitaka; Fujihira, Masamichi

doi:10.1016/j.ultramic.2008.04.033

Cited by 5 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12,27,38,39 Different single molecular conductance sets should correspond to different contacts formed in molecular junctions. [40][41][42] Thus, we believe the different single molecular conductance values observed here can also be attributed to the different preferential contact conformations in the stable Ru(tpy-SH) 2 molecular junctions. 24,43,44 More specically, the 3 conductance sets have been related to the binding congurations of the moleculeelectrode interface 45,46 and accordingly our measured conductance G H should correspond to the hollow-hollow conguration, G M the hollow-top conguration, and G L the top-top conguration.…”

mentioning

confidence: 79%

Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

et al. 2013

View full text Add to dashboard Cite

Negative differential resistance (NDR) behaviors of single molecule junctions composed of a thiol-terminated Ru(ii) bis-terpyridine (Ru(tpy-SH)2) molecule sandwiched between two gold electrodes are measured using a specifically modified scanning probe microscope break junction technique (SPMBJ) at room temperature. The low-bias (0.623 ± 0.135 V) NDR observed for one of the three conductance groups is contact specific and is caused by a bias induced electrode-molecule coupling changes.

show abstract

mentioning

confidence: 79%

Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

et al. 2013

View full text Add to dashboard Cite

show abstract

“…smaller size 0.0091553 nA was to finer in the histogram. 52) By selecting i-s curves having current steps, the effect of the background tunneling currents was clearly reduced in the current range less than 0.4 nA. As a result, several current peaks are seen in the corrected histogram in Fig.…”

Section: Correction Of Conductance Histograms For Sam Of Dab and Assi...mentioning

confidence: 96%

“…This difference has been explained recently by the change in by covering a substrate gold surface with a SAM. 52) The effect of the presence of the SAM on became much more evident by the use of a SAM with a much smaller the highest occupied molecular orbital-the lowest unoccupied molecular orbital (HOMO-LUMO) gap (e.g., 1,4-phenylenediamine).…”

Section: Correction Of Conductance Histograms For Sam Of Dab and Assi...mentioning

confidence: 99%

Three Contact Modes of Amino Terminal Groups on Gold in Single Molecular Junction of Au/1,4-Diaminobutane/Au

Omori

Tobita

Kato

et al. 2007

jjap

View full text Add to dashboard Cite

The effect of the binding modes of two amino terminal groups present on two gold protrusions on currents passing through a single molecular junction of Au/1,4-diaminobutane/Au was studied via the repeated formation of a break junction using a scanning tunneling microscope (STM) under nitrogen at room temperature. In addition to the two reported (high and low) values of the single molecular conductance of diaminobutane, another lower conductance was found through a careful analysis of histograms in a low-current range (0–0.3 nA). The techniques used here to improve the determination of the values of single molecular conductance were the selection of valid i–s curves with current steps and the use of the robust statistical method to correct for the contribution of the background tunneling currents to the current histograms. These three single molecular conductance values are attributed to three different binding modes of the two terminal amino groups giving the three different contact resistances at room temperature. That is, each amino terminal group is likely to be bound to one or the other gold protrusion through a more or a less conductive contact mode. Thus, a single molecular junction between two gold electrodes has three different contact modes, i.e., i) more–more, ii) more–less (or less–more), and iii) less–less conductive contact modes at the two ends.

show abstract

“…molecules was measured while breaking a gold point contact in a solution of the molecules in [18]. A conductance value of BDA in a lower current range was found in [22]. The conductance of individual BDA-Au molecular junctions was measured in different solvent environments using a point contact technique based on a scanning tunneling microscope.…”

Section: Introductionmentioning

confidence: 99%

Activation–relaxation processes and related effects in quantum conductance of molecular junctions

2019

View full text Add to dashboard Cite

We reveal the comparative relationship between small changes in quantum conductivity behavior for molecular junctions. We clarify the mechanisms of acquiring and losing additional thermal activation energy during average current flow in a gold-1,4 benzenediamine (BDA)-gold molecular junction and explain the quantum conductance modulation process. Small changes in working temperature lead to a change in quantum conductivity, which is reflected in random telegraph signal behavior. We demonstrate the high sensitivity of the BDA molecules to small changes in temperature. For BDA molecules, conductance thermo-sensitivity values are relatively high near to 0.8 ÷ 1.6 × 10 − 7 Ω − 1 K − 1 . This advantage can be used to measure weak variations in the ambient temperature. We show that the additional thermal energy arising from the change in temperature can impact on the strength of the electrode-molecule coupling, on the modulation of quantum conductivity. Local changes in quantum conductance of the order of quanta or smaller are conditioned by small random changes in the working regime arising from some of the activation processes. On the basis of the modulation of conductance, we calculate the magnitude of the spring constant of the 1,4 benzenediamine molecule as k s ≈ 7.1 × 10 − 3 N m − 1 at the stretching length of 0.03 nm for the Au−NH2 molecular junction.

show abstract

Single molecular conductance measurements of molecular junction of Au/1,4-phenylenediamine/Au

Cited by 5 publications

References 42 publications

Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

Three Contact Modes of Amino Terminal Groups on Gold in Single Molecular Junction of Au/1,4-Diaminobutane/Au

Activation–relaxation processes and related effects in quantum conductance of molecular junctions

Contact Info

Product

Resources

About