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Ultrathin Molecular Layer Junctions Based on Cyclometalated Ruthenium Complexes
摘要： A cyclometalated ruthenium complex has been designed to be immobilized on a surface by diazonium electroreduction. Modified surfaces have been obtained and fully characterized by XPS, electrochemistry and AFM. Molecular junctions consisting of Ru(bpy)2(ppy) oligomer using direct top-coat evaporation are presented.
关键词： XPS,diazonium electroreduction,molecular junctions,AFM,cyclometalated ruthenium complexes,electrochemistry
更新于2025-09-23 15:21:21
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Carbazole Green and Blue-BODIPY Dyads and Triads as Donors for Bulk Heterojunction Organic Solar Cells
摘要： Two BODIPY derivatives with one (B2) and two (B3) carbazole moieties were designed, synthesized and applied as electron-donor materials in organic photovoltaic cells (OPV). The optical and electrochemical properties were systematically investigated. These BODIPY dyes exhibit excellent solubility in organic solvents and present high molar extinction coefficients (1.37–1.48 x 105 M-1 cm-1) in solutions with absorption maxima at 586 nm for mono-styryl group and at 672 nm for di-styryl groups. The introduction of the styryl moieties result in a large bathochromic shift and a significant decrease in the HOMO-LUMO energy-gaps. The BODIPY dyes show relatively low HOMO energies ranging from -4.99 to -5.16 eV as determined from cyclic voltammetry measurements. Cyclic voltammetry measurements and theoretical calculations demonstrate that the frontier molecular orbital levels of these compounds match with PC71BM as the acceptors, supporting their application as donor materials in solution-processed small molecule bulk heterojunction (BHJ) organic solar cells. After the optimization of the active layer, B2:PC71BM and B3:PC71BM based organic solar cells showed the overall power conversion efficiency of 6.41% and 7.47%, respectively. The higher PCE of B3 based OSC is ascribed to the more balanced charge transport and exciton dissociation, better crystalline and molecular packing.
关键词： bulk heterojunction,Green and blue-BODIPY,electrochemistry,power conversion efficiency
更新于2025-09-23 15:21:01
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Light addressable ion sensing for real-time monitoring of extracellular potassium
摘要： Visualization of ion distribution has broad applications. We report here on a light addressable potassium (K+) sensor where light illumination of a semiconducting silicon electrode substrate results in a localized activation of the faradaic electrochemistry at the illuminated spot. This allows one, by electrochemical control, to oxidize surface bound ferrocene moieties that in turn trigger K+ transfer from the overlaid K+-selective film to the solution phase. The resulting voltammetric response is shown to be K+-selective, where peak position is a direct function of K+ activity at the surface of electrode. This concept was used to measure extracellular K+ concentration changes by stimulating living breast cancer cells. The associated decrease of intracellular K+ level was confirmed with a fluorescent K+ indicator. In contrast to light addressable potentiometry, the approach introduced here relies on dynamic electrochemistry and may be performed in tandem with other electrochemical analysis when studying biological events on the electrode.
关键词： physiological condition,potassium,light activated electrochemistry,ion-selective electrode,potentiometry
更新于2025-09-23 15:21:01
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Light addressable ion sensing for real-time monitoring of extracellular potassium
摘要： Visualization of ion distribution has broad applications. We report here on a light addressable potassium (K+) sensor where light illumination of a semiconducting silicon electrode substrate results in a localized activation of the faradaic electrochemistry at the illuminated spot. This allows one, by electrochemical control, to oxidize surface bound ferrocene moieties that in turn trigger K+ transfer from the overlaid K+-selective film to the solution phase. The resulting voltammetric response is shown to be K+-selective, where peak position is a direct function of K+ activity at the surface of electrode. This concept was used to measure extracellular K+ concentration changes by stimulating living breast cancer cells. The associated decrease of intracellular K+ level was confirmed with a fluorescent K+ indicator. In contrast to light addressable potentiometry, the approach introduced here relies on dynamic electrochemistry and may be performed in tandem with other electrochemical analysis when studying biological events on the electrode.
关键词： physiological condition,potassium,light activated electrochemistry,ion-selective electrode,potentiometry
更新于2025-09-23 15:21:01
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Near-Infrared Photoluminescence and Electrochemiluminescence from a Remarkably Simple Boron Difluoride Formazanate Dye
摘要： Electrochemiluminescence involves the generation of light via electrochemical reactions and has recently shown utility for single-cell imaging. To further develop this novel imaging platform, it is necessary to produce readily available dyes that photoluminesce and electrochemiluminesce in the near-infrared region to limit absorption by biological tissue. To address this need, we prepared a boron difluoride formazanate dye that exhibits near-infrared photoluminescence in two straightforward synthetic steps. Examination of its solid-state structure suggests that the N-aryl substituents have significant quinoidal character, which narrows the S1-S0 energy gap and leads to near-infrared absorption and photoluminescence. Electrochemical properties were probed using cyclic voltammetry and revealed four electrochemically reversible waves. Electrochemiluminescence properties were examined in the presence of tri-n-propylamine, leading to maximum intensity at 910 nm, at least 85 nm (1132 cm?1) red-shifted compared to all other organic dyes. This work sets the stage for the development of future generations of dyes for emerging applications, including single-cell imaging, that require near-infrared photoluminescence and electrochemiluminescence.
关键词： NIR electrochemiluminescence,Electrochemistry,Formazanate ligands,Organic dyes,NIR photoluminescence
更新于2025-09-23 15:21:01
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A Pentacene-based Nanotube Displaying Enriched Electro/Photochemical Activities
摘要： We report the first synthesis of a pentacene-based nanotube displaying a tubular conformation in solution. The product possesses a triangular prismatic structure with three pentacene chromophores connected by a rigid, triangular backbone. Steady-state and time-resolved spectroscopic analyses revealed that the nanotube exhibits enriched electro/photochemical activities due to the close proximity of the three pentacene chromophores, which allows for efficient intramolecular singlet fission and long-lived triplet excitons.
关键词： photochemistry,pentacene,singlet fission,nanotube,triplet excitons,electrochemistry
更新于2025-09-23 15:21:01
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A new way to obtain black electrochromism: Appropriately covering whole visible regions by absorption spectra of the copolymers composed of EDOT and carbazole derivatives
摘要： There are limited numbers of studies in the literature about the materials show electrochromic properties between black and transparent. In this study, black-to-transmissive electrochromic materials have been obtained as a result of electrochemical co-polymerization of carbazole derivatives (Cz1 and Cz2) and EDOT. Homopolymer and copolymers synthesizing different monomer feed ratios have been characterized by electrochemical and spectroelectrochemical methods. Thus, a new simple and fast method for obtain black electrochromic material has been proposed.
关键词： copolymerization,electrochemistry,Black-electrochromic,conducting polymer,polycarbazole
更新于2025-09-23 15:21:01
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Preparation of 3D Au NPs-poly-L-glutamate/graphene Nanocomposite Modified Electrode for Sensing of Bisphenol A
摘要： In this work, a simple, sensitive and rapid electrochemical sensor for bisphenol A determination based on a 3D Au NPs-poly-L-glutamate/graphene nanocomposite was proposed and the structures of the nanocomposite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopic (FTIR) and X-ray diffraction (XRD). The electrochemical behaviors of bisphenol A on the nanocomposite GCE were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). In the potential range of 0.0 ~ 1.0 V, an irreversible oxidation peak appeared on the modified electrode in 0.1 mol L-1 phosphate buffer solution (pH = 6.0). Under the optimum conditions, the anode peak current of bisphenol A increased linearly with the its concentration in the ranges from 0.009 μmol L-1 to 0.1 μmol L-1 and 0.1 μmol L-1 to 1.0 μmol L-1with the detection limit down to 3×10 ?10 mol L-1 (S/N = 3) and the corresponding linear regression equations were Ipa( μA)= ? 0.1129 C ( μmol L-1) + 0.5532 (N = 6, R2 = 0.9057) and Ipa( μA) = ? 0.05970 C ( μmol L-1) + 0.02182 (N = 5, R2 = 0.9950) respectively. The proposed method was successfully used for the determination of bisphenol A content in wastewater and milk samples, and the recoveries were in the range from 98.10% to 104.9%.
关键词： L-glutamic acid,bisphenol A,graphene,sensors,electrochemistry
更新于2025-09-23 15:21:01
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Electrochemical Exfoliation of MoS <sub/>2</sub> Crystal for Hydrogen Electrogeneration
摘要： Transition metal dichalcogenides (TMDs) have recently emerged within the group of 2D materials due to their electrical, catalytic and optical properties significantly enhanced and useful when down-sized to single layer. In particular, MoS2 has attracted much attention due to its semiconducting nature with a useful band gap when present as single layer, the enhanced photoluminescence, but also importantly the excellent catalytic properties towards the electrochemical hydrogen evolution. We present here the preparation of thin layers MoS2 nanosheets with enhanced catalytic properties towards the hydrogen evolution reaction by means of an easy and fast electrochemical top-down exfoliation procedure in aqueous solution from a naturally occurring MoS2 crystal. After structural and chemical characterization with STEM, AFM, XPS and Raman spectroscopy electrochemical investigations were performed to test catalytic properties in acidic solution for the electrogeneration of hydrogen and compare it to MoS2 nanosheets obtained through the widely employed chemical Li intercalation/exfoliation. Electrochemically exfoliated MoS2 shows lower Tafel slope than its counterpart obtained with chemical exfoliation.
关键词： hydrogen evolution reaction,molybdenum sulfide,electrochemistry,layered compound,exfoliation
更新于2025-09-23 15:21:01
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Controlled aggregation of Ag nanoparticles on oxide templates on nitinol by electrodeposition
摘要： Nitinol is an unusual material for hard-tissue replacements because of their unique superelasticity, biocompatibility, and low elastic modulus. Nitinol surface was modified by plasma electrolytic oxidation with an aim to produce oxide film on the surfaces for inhibiting Ni ion release. In addition, various Ag structures were constructed on the oxide templates on nitinol using electrodeposition in an AgC2H3O2-based solution for improving the antibacterial ability. Control of the electrolyte by collagen concentration caused a change in Ag shape and aggregation. Preferred growth along Ag (111) by orientated attachment of the Ag led to the formation of Ag dendrites in the AgC2H3O2 solution. Spherical Ag nanostructures, which were well dispersed on the templates, were obtained by electrodeposition in an AgC2H3O2-collagen solution on templates. Increasing the concentration of collagen caused aggregated Ag to form coarse spherical structures with a non-uniform distribution.
关键词： Deposition,shape memory alloys (SMA),Biomaterials,Electrochemistry
更新于2025-09-23 15:19:57