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Potential Dependence of Mechanical Stability and Electronic Coupling of Single S-Au Bonds
摘要： Providing a mechanically stable and electronically efficient coupling between a molecule and an electrode is critical to the study of charge transfer and conductance of the molecule. A common method is to link the molecule to Au electrodes via a linker (e.g., thiol terminal of the molecule). Here we study the mechanical stability and electronic coupling of S-Au bond in single molecule junctions over a broad range of electrode potential. Our results show that the mechanical and electromechanical properties of molecule-electrode contact undergo a systematic change with the potential involving Au oxidation at positive potentials and S protonation at negative potentials. The study establishes the potential range for a stable S-Au bond and determines the potential dependence of the mechanical and electromechanical properties of the molecule-electrode contact, which is crucial to the interpretation of potential dependent charge transfer in electrochemistry and electrochemical gating of charge transport in molecular electronics.
关键词： molecule-electrode contact,electronic coupling,electrode potential,S-Au bond,mechanical stability
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - High performance x-ray source using point-typed CNT field emitter
摘要： The high performance cold cathode x-ray source was fabricated by using the point-typed CNT field emitter. The cold cathode x-ray source consists of the CNT point emitter, the metal mesh gate electrode, the metal hole focusing lens and the tungsten target anode electrode. To fabricate x-ray source, such components were mounted in a SUS vacuum chamber. The fabricated CNT x-ray source showed a good resolution of x-ray images at a low anode current and at a low anode voltage, and also indicated stable operation. We evaluated x-ray images according to the tube voltage and the tube current, respectively.
关键词： point-typed field emitter,carbon nanotube field emitter,metal mesh gate electrode,x-ray image,cold cathode x-ray source,tungsten anode electrode
更新于2025-09-23 15:21:21
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AIP Conference Proceedings [Author(s) PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017) - Bali, Indonesia (26–27 July 2017)] - Nickel sulfide sensitized TiO2 nanotubes system as photo-anode: Will this system active under visible light and why?
摘要： This work is dedicated to enhance the photo catalytic activity of the modified 2 nanotube under visible light exposure. The narrow band gap of semiconductor such as NiS can be incorporated onto TiO2 nanotube (NiS/TiO2-NT) to obtain a composite which may active under visible light. The TiO2 nanotube was self-prepared by electro-oxidation of titanium plate in electrolyte containing ethylene glycol, NH4F, and water. Meanwhile, the incorporation of NiS onto TiO2 film was prepared by successive ionic layer absorption and reaction (SILAR) method, in which nickel(II) ion and sulfide ion were used as the precursor of NiS, to obtain the NiS/TiO2-NT film system. The obtained NiS/TiO2-NT films were characterized by UVDRS, FTIR, SEM, XRD, and photo-electro-chemical work station. The resultsindicated that the peak of absorption spectra of NiS/TiO2-NT fall within thevisible light region, which the final band gap was 2.85 eV; IR and XRD spectra were also revealed the characteristic peak of NiS/TiO2-NT system. Photo-electrochemical investigation revealed that the evolution of photocurrent under visible light (100 W wolfram lamp), as much as 0.26 mA/cm2 typically can be easily observed.
关键词： photo-electrode,SILAR,NiS/TiO2
更新于2025-09-23 15:21:21
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Electrode-free anodic oxidation nanolithography of low-dimensional materials
摘要： Scanning probe lithography based on local anodic oxidation (LAO) provides a robust and general nanolithography tool for a wide range of applications. Its practical use, however, has been strongly hampered due to the requirement of a pre-fabricated micro-electrode to conduct the driving electrical current. Here we report a novel electrode-free LAO technique, which enables in-situ patterning of as-prepared low-dimensional materials and heterostructures with great flexibility and high precision. Unlike conventional LAO driven by a DC current, the electrode-free LAO is driven by a high-frequency (>10 kHz) AC current applied through capacitive coupling, which eliminates the need of a contacting electrode and can be used even for tailoring insulating materials. Using this technique, we demonstrated flexible nanolithography of graphene, hexagonal boron nitride (hBN), and carbon nanotubes (CNTs) on insulating substrates with ~10-nanometer precision. In addition, the electrode-free LAO exhibits high etching quality without oxide residues left. Such an in-situ and electrode-free nanolithography with high etching quality opens up new opportunities for fabricating ultraclean nanoscale devices and heterostructures with great flexibility.
关键词： electrode-free local anodic oxidation,graphene,high-frequency AC voltage,low-dimensional materials,Scanning probe lithography
更新于2025-09-23 15:21:21
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A single-cell-gap transflective liquid crystal display with a vertically aligned cell
摘要： A single-cell-gap transflective liquid crystal display with a vertically aligned cell using square ring electrode is demonstrated. The top substrate has a top planar common electrode, a square ring pixel electrode is coated on the bottom substrate, while a bumpy reflector is coated under the bottom substrate. In this device, the planar common electrode and square ring pixel electrode generate a strong longitudinal electric field in the transmissive region (T region) and a weak fringe field in the reflective region (R region). As result, the T and R regions accumulate the same optical phase retardation. The simulation results show that the display exhibits reasonably low operating voltage, high transmittance and well-matched voltage-dependent transmittance and reflectance curves. Besides, fabrication process of the transflective liquid crystal display is very simple.
关键词： square ring electrode,Vertically aligned cell,negative dielectric anisotropy,single-cell-gap,transflective liquid crystal display
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Stable and low noise field emission from single p-type Si-tips
摘要： Single gated p-type Si-tips with two different tip radii were fabricated. An emission current of 2.40 μA was measured for the sharp-edged tip at a voltage of 170 V. In contrast, a stable and reproducible emission behavior was observed with an increased tip radius resulting in a pronounced saturation region between 90 V and 150 V, but merely an emission current of 0.55 μA at 150 V. More remarkable is the stable emission behavior with fluctuation of ± 4 % during a measurement period of 30 minutes. The integral emission current in a homogeneous tip array (16 emitters) showed nearly the same I-V characteristics compared to the single tip and is therefore, most dominated by only a stable single tip in the array.
关键词： gate-electrode,p-type Si-tips,low current fluctuations,emission stability,field emission
更新于2025-09-23 15:21:21
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Sensitive Determination of Terbutaline Using a Platform Based on Nanoparticles of Europium Oxide and Carbon Nanotubes
摘要： This study presents a sensitive voltammetric determination of terbutaline (TER) on a platform based on carbon nanotubes (CNTs) and europium oxide nanoparticles (Eu2O3NPs) coated glassy carbon electrodes (GCEs). An ultrasonic bath was performed for the preparation of composite material. The material was characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction method (XRD) and scanning electron microscopy (SEM). The Eu2O3NPs/CNTs/GCE system was assessed for the oxidation of terbutaline (TER). A broad oxidation peak was appeared at 0.71 V using a bare GCE. However, the voltammetry of TER has been improved at a GCE coated with CNTs and a well-defined anodic peak exhibited at 0.61 V. Furthermore, the nanoparticles of Eu2O3 and CNTs coated GCE has greatly improved the electrochemical behaviour of TER and a sharp peak was appeared at 0.59 V. Cyclic voltammetry at Eu2O3NPs/CNTs/GCE also reveals a high catalytic effect for the oxidation of TER with an oxidation peak that is distinctly enhanced compared to GCE and CNTs/GCE. Eu2O3 nanoparticles were utilized to enhance the surface area of GCE and then improve the sensitivity of the procedure. The response of TER was linear over a concentration range of 2.0 3 10?8 M ?9.5 3 10?6 M with an LOD of 3.7 3 10?9 M. Square wave voltammetric analysis of tablets by Eu2O3NPs/CNTs/GCE yielded a recovery of 99.2 % with an RSD% of 3.2. The modified electrode (EuO2NPs/CNTs/GCE) provides accuracy and precision to the analysis of samples.
关键词： europium oxide nanoparticles,modified electrode,composite material,terbutaline
更新于2025-09-23 15:21:21
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The Effect of Process Condition on the Structure and Optical Properties of Zn/Fe/Sn/Sb-TiO <sub/>2</sub> Three Dimensional Particle-Electrode
摘要： In this experiment, photocatalysic material ,which is magnetic, photoluminesce and has superior light absorbing mesoporous, was synthesized by sol-gel method with tetrabutyl titanate(cid:451)zinc acetate(cid:451)stannic chloride (cid:451) antimonic chloride and ferric nitrate as precursors, and tri-blocked copolymer F127 as the template.Based on the experiment results, when the annealing temperature is at 550(cid:263), the annealing time is 120min , the doping amount of Zn is 4.0at% . These produced samples were shown to have superior luminescence and UV-vis light absorbance. When the weight of template was set to 1.5g, the obtained photocatalysic materials, indicated that their porous mainly distributed within 1.2nm to 4.7nm and their specific surface areas were larger than 110m2/g, and had excellent absorption properties.
关键词： Three Dimensional Particle-Electrode,Optical Properties,Structure,Process Condition
更新于2025-09-23 15:21:21
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New fabrication method for producing reduced graphene oxide flexible electrodes by using low-power visible laser diode engraving system
摘要： The fabrication of bendable electronic devices is being a scientific-technological area of very rapid advance in which new materials and fabrication techniques are being continuously developed. In this kind of devices, the fabrication of flexible conductive electrodes adherent to the substrate is a key factor. Besides, eco-friendliness, low cost and fast production are essential requirements for the successful progress of new technologies. In this work, a novel method for obtaining graphene-based flexible electrodes is presented. Conductive films were obtained by means of visible laser irradiation of graphene oxide layers deposited on polyethylene terephthalate substrates besides self-standing membranes sandwiched between glass slides. Despite the low power of the laser system, numerical simulations indicate the development of temperatures over 1000 K throughout the irradiated material. The laser-induced spatially confined heating leads to the reduction of the graphene oxide material whereas the glass-based sandwich assembly avoids reoxidation from surrounding air. By scanning and pixelated modes, reduced graphene oxide electrodes, up to 100 μm in thickness, and with resistivity as low as 6×10-4 ?m were obtained in an easy and versatile way. Proof-of-concept microsupercapacitors and electrochemical sensors were fabricated with this technique, showing promising performance.
关键词： laser fabrication,flexible electrode,laser-reduced graphene oxide,graphene electrode
更新于2025-09-23 15:21:01
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Biomass-derived carbon boosted catalytic properties of tungsten-based nanohybrids for accelerating the triiodide reduction in dye-sensitized solar cells
摘要： Manganese tungstate (MWO), zinc tungstate (ZWO), and copper tungstate (CWO) embedded biomass-derived carbon (MWO-C, ZWO-C, CWO-C) was synthesized by hydrothermal treatment and investigated as counter electrode (CE) catalyst to test electrochemical activity. Biomass-derived carbon was used as the shape controlling agent, which changed the morphology of MWO from spherical to spindle-like. Owing to the synergistic effect between tungsten-based bimetal oxides and biomass-derived carbon, the MWO-C, ZWO-C, and CWO-C catalysts exhibited enhanced electrochemical performance in dye-sensitized solar cells (DSSCs) system. The MWO-C, ZWO-C and CWO-C catalysts in DSSCs showed outstanding power conversion efficiency (PCE) of 7.33%, 7.61%, and 6.52%, respectively, as compared with 7.04% for Pt based devices. Biomass-derived carbon improves the catalytic properties of tungsten-based nanohybrids. The results showed that biomass-derived carbon-enhanced inorganic compound as CE catalysts are promising alternatives to Pt-based CE catalysts for energy conversion devices.
关键词： Triiodide reduction reaction,Counter electrode catalyst,Biomass-derived carbon,Tungsten-based nanohybrids,Dye-sensitized solar cells
更新于2025-09-23 15:21:01