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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1021/la702811t
|2 doi
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|a pubmed24n0591.xml
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|a (DE-627)NLM177259191
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|a (NLM)18237208
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Kiani, Abolfazl
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Scanning electrochemical microscopy. 59. Effect of defects and structure on electron transfer through self-assembled monolayers
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 14.05.2008
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|a Date Revised 16.11.2017
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Electron transfer (ET) rate kinetics through n-alkanethiol self-assembled monolayers (SAMs) of alkanethiols of different chain lengths [Me(CH2)nSH; n=8, 10, 11, 15] on Au and Hg surfaces and ferrocene (Fc)-terminated SAMs (poly-norbornylogous and HS(CH2)12CONHCH2Fc) on Au were studied using cyclic voltammetry and scanning electrochemical microscopy (SECM). The SECM results allow determination of the ET kinetics of solution-phase Ru(NH3)63+/2+ through the alkanethiol SAMs on Au and Hg. A model using the potential dependence of the measured rate constants is proposed to compensate for the pinhole contribution. Extrapolated values of koML for Ru(NH3)63+/2+ using the model follow the expected exponential decay (beta is 0.9) for different chain lengths. For a Fc-terminated poly-norbornyl SAM, the standard rate constant of direct tunneling (ko is 189+/-31 s(-1)) is in the same order as the ko value of HS(CH2)12CONHCH2Fc. In blocking and Fc SAMs, the rates of ET are demonstrated to follow Butler-Volmer kinetics with transfer coefficients alpha of 0.5. Lower values of alpha are treated as a result of the pinhole contribution. The normalized rates of ET are 3 orders of magnitude higher for Fc-terminated than for blocking monolayers. Scanning electron microscopy imaging of Pd nanoparticles electrochemically deposited in pinholes of blocking SAMs was used to confirm the presence of pinholes
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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| 650 |
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|a Alkanes
|2 NLM
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| 650 |
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|a Ferrous Compounds
|2 NLM
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|a Membranes, Artificial
|2 NLM
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|a Metallocenes
|2 NLM
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|a Sulfhydryl Compounds
|2 NLM
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|a Gold
|2 NLM
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| 650 |
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|a 7440-57-5
|2 NLM
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| 650 |
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|a Mercury
|2 NLM
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| 650 |
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|a FXS1BY2PGL
|2 NLM
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| 650 |
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|a ferrocene
|2 NLM
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| 650 |
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|a U96PKG90JQ
|2 NLM
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| 700 |
1 |
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|a Alpuche-Aviles, Mario A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Eggers, Paul K
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jones, Michael
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gooding, J Justin
|e verfasserin
|4 aut
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| 700 |
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|a Paddon-Row, Michael N
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bard, Allen J
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 24(2008), 6 vom: 18. März, Seite 2841-9
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:24
|g year:2008
|g number:6
|g day:18
|g month:03
|g pages:2841-9
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|u http://dx.doi.org/10.1021/la702811t
|3 Volltext
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|h 2841-9
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