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Molecular tilt-dependent and tyrosine-enhanced electron transfer across ITO/SAM/[DPPC–Au NP–Tyrosine] Janus nanoparticle junction
Published in Springer Netherlands
2016
Volume: 18
   
Issue: 9
Abstract
Abstract: Enhanced interfacial electron transfer (ET) across the otherwise insulating indium tin oxide/alkanethiol self-assembled monolayer (SAM)/redox molecule junction was accomplished when a Janus gold nanoparticle (JNP) protected by bioinspired phosphatidylcholine (DPPC) lipid and tyrosine amino acid ligands was anchored on it. In addition to the most theoretical and experimental investigations on the distance-dependent ET across Metal–Organic SAM–Nanoparticle (NP) architectures, the current results succinctly illustrate molecular tilt angle of the SAM and the characteristic of JNP as key factors in expediting the ET rate via electron tunneling. In the absence of JNP, electron tunneling with a tunneling factor β = 1.1 Å−1 across the SAM was the rate-limiting step, evidenced from electrochemical impedance spectroscopy (EIS). The apparent electron transfer rate constant (kapp 0) for anchored SAM was enhanced by at least one order of magnitude than the DPPC-only protected nanoparticle, suggesting the potential role of tyrosine towards the enhanced ET. The asymmetric and biogenic nature of the construct sheds light on a potential bioelectronic device for novel electronic attributes. Graphical abstract: Entry of TOC [Figure not available: see fulltext.]. © 2016, Springer Science+Business Media Dordrecht.
About the journal
JournalData powered by TypesetJournal of Nanoparticle Research
PublisherData powered by TypesetSpringer Netherlands
ISSN13880764
Open AccessNo
Concepts (41)
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    Amino acids
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    Electrochemical impedance spectroscopy
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    Electron transitions
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    Electron transport properties
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    Electron tunneling
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    Electrons
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    Gold
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    Metal nanoparticles
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    Molecular orientation
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    Monolayers
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    Nanoparticles
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    Organic polymers
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    Rate constants
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    TIN OXIDES
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    BIOELECTRONIC DEVICE
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    Electron transport
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    ELECTRON-TRANSFER RATE CONSTANTS
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    Experimental investigations
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    FT-IRRAS
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    INTERFACIAL ELECTRON TRANSFER
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    Janus nanoparticles
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    Phosphatidylcholine
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    Self assembled monolayers
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    Gold nanoparticle
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    Indium tin oxide
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    JANUS GOLD NANOPARTICLE
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    Self assembled monolayer
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    Tyrosine
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    Unclassified drug
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    Article
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    Chemical structure
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    Electrochemistry
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    Molecular interaction
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    MOLECULAR TILT
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    Nanoanalysis
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    Nanofabrication
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    Oxidation reduction reaction
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    Priority journal
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    Process optimization
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    Semiconductor
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    Tilting