Pt monolayer decorated gold nanostructured film on planar p-type silicon is utilized for photoelectrochemical H2 generation in this work. First, was spontaneously produced by galvanic displacement of the reduction ion and oxidation presence fluoride anion. Second, underpotential deposition (UPD) copper under illumination Cu followed exchange less-noble with more-noble PtCl6(2-). Pt(shell)/Au(core) showed similar activity platinum nanoparticle hydrogen evolution reaction spite low loading....

We demonstrate the amplified detection of a target DNA based on enzymatic deposition silver. In this method, and biotinylated probe hybridize to capture tethered onto gold electrode. Neutravidin-conjugated alkaline phosphatase binds biotin electrode surface converts nonelectroactive substrate enzyme, p-aminophenyl phosphate, into reducing agent, p-aminophenol. The latter, in turn, reduces metal ions solutions leading backbone. This process, which we term biometallization, leads great...

We investigated the charging current in cyclic voltammetry and galvanostatic charging/discharging behavior of a controversial constant-phase element (CPE) to describe an electrical double layer used only electrochemical impedance spectroscopy. The linear potential sweep time domain was transformed into frequency using Fourier transform. phasor estimated by Ohm's law with voltage frequency-dependent CPE, followed inverse transform determine domain. For charging/discharging, same procedure,...

Tafel analysis and electrochemical impedance spectroscopy (EIS) have been widely used to characterize many kinds of electrocatalysts. The former provides the kinetic information an reaction with exchange current while latter does charge transfer resistance closely related current. Both techniques, however, suffer from practical troubles which often decrease their reliabilities. In order circumvent those troubles, alternative was suggested that combined EIS, even though its theoretical...

In this paper, a macro-scale, phenomenological constitutive model for shape memory alloys is used in conjunction with energy balance equations to study the evolution of temperature and deformation profiles seen SMA wires under specific thermal mechanical boundary conditions. The general, fully coupled thermo-mechanical problem formulated analytical solutions are determined decoupled case limit cases. Results two initial/boundarv value problems presented here: 1) resistive heating an...

The highly monodisperse PtRu (1:1) colloidal nanoalloy was prepared by the co-reduction of Pt(acac)2 and Ru(acac)3 precursors, deposited on a Vulcan carbon (Vc) support subsequently treated acetic acid to generate active PtRu/Vc catalyst, which showed remarkable performance catalytic activity in methanol oxidation.

Oxide dielectric materials play a key role in wide range of high-performance solid-state electronics from semiconductor devices to emerging wearable and soft bioelectronic devices. Although several previous advances are noteworthy, their typical processing temperature still far exceeds the thermal limitations materials, impeding utilization these fields. Here, we report an innovative route form highly reliable aluminum oxide films using ultralow-temperature (<60 °C) solution process with...

This work demonstrates the utilization of short-time Fourier transform (STFT), and continuous wavelet (CWT) electrochemical impedance spectroscopy (EIS) for time-resolved analysis stochastic collision events platinum nanoparticles (NPs) onto gold ultramicroelectrode (UME). The enhanced electrocatalytic activity is observed in both chronoamperometry (CA) EIS. CA provides impact moment rough estimation size NPs. quantitative information such as charge transfer resistance (Rct ) relevant to...

Cyclic voltammetry (CV) has been a powerful technique to provide impactful insights for electrochemical systems, including reaction mechanism, kinetics, diffusion coefficients, etc., in various fields of study, notably energy storage and conversion. However, the separation between faradaic current component CV nonfaradaic contribution extract useful information remains major issue researchers. Herein, we report deep learning algorithm inspired by speech denoising that utilizes theoretical as...

Localized electrochemistry on the nanometer scale is studied using a pyramidal hydrogel tip containing an electrolyte and applied to 3-dimensional printing of metallic nanostructures by localized electrodeposition.

The effect of selenium in CdZnTe was investigated by characterizing the Cd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.9</sub> Zn xmlns:xlink="http://www.w3.org/1999/xlink">0.1</sub> Te xmlns:xlink="http://www.w3.org/1999/xlink">0.98</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">0.02</sub> crystal. bandgap is smaller than Te. In addition, its value ingot follows zinc-segregation tendency that selenium. There a recognizable difference...

Positive- and negative-type metal photomasks are fabricated by dip-pen nanolithography (see picture). Positive-type generated with a multiple-pen array at rate rivaling electron-beam lithography. For the photomasks, poly(ethylene glycol) ink is used as resist lift-off material.

We investigated the static charge generation by contact electrification between Au and polydimethylsiloxane (PDMS) redox reaction in aqueous phase, to reveal mechanism of which may be applied mechanical-to-chemical energy harvesting. First, distribution on equipotential was probed through Kelvin probe force microscopy (KPFM) air after with patterned PDMS. Positive charges are localized areas indicating ion migration while polarity becomes negative water contact. Second, charged...

&lt;p&gt;An unconventional fabrication technique of nanoelectrode was developed using atomic force microscopy (AFM) and hydrogel. Until now, the precise control electroactive area down to a few nm&lt;sup&gt;2&lt;/sup&gt; has always been an obstacle, which limits wide application nanoelectrodes. Here, nanometer-sized contact between boron-doped diamond (BDD) as conductive AFM tip agarose hydrogel solid electrolyte well governed by feedback amplitude oscillation in non-contact mode AFM....

This letter provides the first study aimed at characterizing desorption and nanolithographic processes for SAM-coated, gold-coated silicon substrates oxidatively patterned with an AFM a tip under potential control. The process either results in recessed patterns where monolayer has been removed or raised structures oxidation taken place. Eleven different SAMs have studied, type of pattern formed depends markedly upon SAM chain length, end functional group, applied bias. We show how local pH...

The role of silver ions in the seed-mediated growth gold nanostructures has been investigated. Silver submonolayer or monolayer on specific facet is assumed previously suggested mechanism owing to underpotential deposition (UPD) by ascorbic acid having weak reducing power. overpotential acid, however, confirmed electrochemical stripping voltammetry, whereas spontaneously formed anti-galvanic reduction absence acid. In presence cetyltrimethylammonium bromide (CTAB), does not occur, but...

We report the implementation of second-generation Fourier transform electrochemical impedance spectroscopy (2G FT-EIS) with commercial potentiostat. Although 2G FT-EIS based on chronoamperometry has several advantages short measurement time and ability time-resolved EIS, a special home-built system is essential, which been an obstacle to wide application FT-EIS. Current potentiostat software, however, sufficient power thanks recent state-of-the art electronics software industry. requires two...

In this paper, we studied charge transfer through a self-assembled monolayer (SAM) of 1-adamantanethiol on gold. Charge the SAM depended type anion present when [Fe(CN)6]3− was used as redox probe. The sluggish process monitored by cyclic voltammetry using relatively large and hydrophobic perchlorate hexafluorophosphate ions supporting electrolyte. contrast, kinetics were nearly identical to those measured bare gold with chloride, sulfate, nitrate We investigated adsorption α- β-cyclodextrin...