In this work, we bridge the gap between short-range tunneling in molecular junctions and activated hopping bulk organic films, greatly extend distance range of charge transport electronic devices. Three distinct mechanisms were observed for 4.5-22-nm-thick oligo(thiophene) layers carbon contacts, with operative when d < 8 nm, > 16 nm high temperatures low bias, a third mechanism consistent field-induced ionization highest occupied orbitals or interface states to generate carriers = 8-22 nm....

Herein, we report the variation of localized surface plasmon resonance (LSPR) gold nanoparticle (NP) arrays covered by poly(3,4-ethylenedioxythiophene) (PEDOT) as a function electronic state polymer. Giant shifts and fine-tuning LSPR NPs surrounded PEDOT/sodium docecyl sulfate have been achieved. The color variations plasmonic/conducting polymer (CP) devices are given not only changes optical properties CP upon doping but also close synergy NP. Such systems can considerably extend field...

Quantum interference in cross-conjugated molecules embedded solid-state devices was investigated by direct current-voltage and differential conductance transport measurements of anthraquinone (AQ)-based large area planar junctions. A thin film AQ grafted covalently on the junction base electrode diazonium electroreduction, while counter directly evaporated top molecular layer. Our technique provides evidence a quantum effect multiple CMOS compatible The is manifested pronounced dip close to...

Sepsis is a life-threatening infection. Escherichia coli the first known cause of bacteremia leading to sepsis. Lymphopenia was shown predict better than conventional markers The pks genomic island, which harbored by extraintestinal pathogenic E. (ExPEC) and encodes genotoxin colibactin, epidemiologically associated with bacteremia. To investigate possible relationship between colibactin lymphopenia, we examined effects transient infection lymphocytes bacteria that were those not producing...

Thin layers of viologen-based oligomers with thicknesses between 3 and 14 nm were deposited on gold electrodes by electrochemical reduction a diazonium salt, then Ti/Au top contact was applied to complete solid-state molecular junction (MJ). MJs show symmetric J- V curves highly efficient long-range transport, an attenuation factor as small 0.25 nm-1. This is attributed both the fact that viologen LUMO energy lies energies Fermi levels two contacts strong electronic coupling molecules...

Thin layers of oligomers with thickness between 7 and 9 nm were deposited on flat gold electrode surfaces by electrochemical reduction diazonium reagents, then a Ti(2 nm)/Au top contact was applied to complete solid-state molecular junction. The investigated included donor molecules relatively high energy HOMO, HOMO–LUMO gaps acceptor low LUMO terminal alkyl chain. Using an oligo(bisthienylbenzene) based layer, molecule whose HOMO level in vacuum is close the Fermi bottom electrode, devices...

Surface grafting from diazonium solutions triggered by localized surface plasmon has been investigated. An organic layer that is 20–30 nm thick easily grafted onto gold nanoparticles (AuNPs) visible-light illumination in a few minutes without any reducing agent or molecular photocatalyst. Grafting depends on the wavelength and polarization of incident light. As consequence, orientation growth deposited AuNPs can be controlled polarized also highly enhanced between adjacent at corners...

The functionalization of electrode materials through diazonium electroreduction using a heteroaromatic compound, without phenyl groups, has been investigated for the first time. electrochemical reduction 2-aminoterthiophenyldiazonium cation, generated in situ, coats (glassy carbon (GC), gold or platinum) with an ultrathin organic layer, shown by X-ray photoelectron spectroscopy (XPS) that deposited on to consist terthiophene oligothiophene. coating is electroactive at potential close...

Molecular junctions were fabricated with the combined use of electrochemistry and conventional CMOS tools. They consist a 5-10 nm thick layer oligo(1-(2-bisthienyl)benzene) between two gold electrodes. The was grafted onto bottom electrode using diazonium electroreduction, which yields stable robust gold-oligomer interface. top contact obtained by direct electron-beam evaporation on molecular layers through masks defined lithography. Transport mechanisms across such easily p-dopable...

The as-yet unidentified E. coli metabolite colibactin induces DNA damage in eukaryotic cells and promotes tumorigenesis. Its wide distribution pathogenic probiotic strains has raised great interest its structure biosynthesis. Here we show that formation involves a rare aminomalonyl unit used as building block.

Abstract Cobalt terpyridine oligomers are compared with π‐conjugated and ruthenium‐centered layers in molecular junctions (MJs) identical contacts. A wide range of layer thickness is investigated, attenuation plots obtained. Strong dependence charge transport on found a variation four orders magnitude current density ( J ) for different molecules d = 7 nm. For Ru(bpy) 3 complex bis‐thienylbenzene MJs, the plot shows two regions corresponding to dominant mechanisms. On contrary Co(tpy) 2...

The electrochemical reduction of 4-nitrophenyl diazonium, NPD, in different ionic liquids presenting viscosities has been investigated. studies show that the diazonium leading to formation its corresponding radical occurs whatever viscosity grafting media. Following that, presence an organic layer attached electrode after treatment was evidenced by cyclic voltammetry (CV) acidic media thanks nitro groups. Moreover, infrared spectroscopy (IR), X-ray photoelectron (XPS), and atomic force...

Six novel probes were prepared by covalent attachment of a G4-DNA ligand (bis(quinolinium) pyridodicarboxamide; PDC) to various coumarin or pyrene fluorophores. In the absence DNA, fluorescence all is quenched due intramolecular photoinduced electron transfer (PET), as evidenced photophysical and electrochemical studies, molecular modeling, DFT calculations. All demonstrate similarly high thermal stabilization substrates belonging different folding topologies, assessed melting experiments;...

We investigate the effect of new redox molecular switches based on oligothiophene deposited gold nanoparticles (AuNPs) as thin electroactive layers in 5–80 nm thickness range. In doing so, we compare systems physisorbed (weak electronic coupling) with those covalently bonded (strong coupling), and orientation effects. Two different deposition methods were used. The first is bithiophene electropolymerization second diazonium salt electroreduction. both cases, switching layer makes possible to...

Poly(ethylenedioxythiophene) (PEDOT) films were electrodeposited galvanostatically from an EDOT/sodium dodecyl sulfate solution in water, through a carboxylated polystyrene template monolayer self-assembled on ITO, after which the was dissolved away tetrahydrofuran. Analysis of by scanning electron microscopy and atomic force reveals large-area PEDOT honeycomb structures. The morphology these structures varied electrochemically, as effective thickness and, surprisingly, shape arrangement...

The electrodeposition of poly(3,4-ethylenedioxythiophene) (PEDOT) films from aqueous surfactant solution through a two-dimensional poly(styrene) (PS) template onto indium tin oxide (ITO) substrate has been investigated. polymer grows in the interstitial spaces self-assembled PS spheres which were subsequently removed by dissolution tetrahydrofuran (THF). Surface characterization scanning electron microscopy (SEM) and atomic force (AFM) reveals that nanoporous honeycomb PEDOT structures can...

Electrochemical oxidation of primary amine in ionic liquid media has been investigated. The chosen for this study was 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. Two compounds are used study; 4-nitrobenzylamine and 2-aminoethylferrocenylmethylether. the amino conduces to modification electrode surface. modified electrodes were characterized by cyclic voltammetry XPS analysis. Both techniques support presence an organic layer strongly attached onto surface concentration...

Electrochemical grafting of a water-insoluble diazonium salt in aqueous media onto an electrode surface was achieved by host-guest complexation. 1-(2-Bisthienyl)-4-aminobenzene (BTAB) solubilized water/beta-cyclodextrin solution (beta-CD). The corresponding generated situ then electroreduced. This process leads to the attachment bithiophene or short oligothiophene groups surface. modified surfaces were analyzed cyclic voltammetry (CV), scanning electrochemical microscopy (SECM), X-ray...

An electron donor-acceptor dyad has been designed for the creation of large-area molecular junctions (MJ). Diazonium cation electrografting was used to form well controlled monolayers. The robustness monolayer enabled MJs using direct top-coat evaporation with a high yield operating devices.

A type of intrinsic luminescence in crystals has been revealed. The excitation threshold well-known fast CsI (300 nm band) obtained from the spectrum measured photon-energy range 5--125 eV at 300 K using synchrotron radiation. starts an energy about 20 and exponentially increases up to 4d ${\mathrm{I}}^{\mathrm{\ensuremath{-}}}$ ionization (\ensuremath{\sim}50 eV). Such high-energy broad is not typical for any conventional mechanisms excitation. We attribute this emission center, which...