Electrochemical amperometric transducers measure electric current to detect the concentration of reagents. This study examined the mass-transfer processes in an electrochemical sensor operating in flow conditions using a numerical model. The transient physical phenomena were investigated in a realistic three-dimensional ~3D! sensor model with a fixed potential of 2350 mV on the electrode surfac...

in this work, poly (o-anisidine) (poa) was prepared by consecutive potential cycling in an acidic monomer solution at the surface of carbon paste electrode (cpe). nickel ions were dispersed into the polymer by immersing the electrode in niso4 solution. the prepared ni/poa/cpe was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, atomic force microscopy (afm) a...

a carbon-paste electrode (cpe) chemically modified with the n-4,4'-azodianiline(ferrocenyl schiff base) complex and multi wall carbon nanotubes (adafcnte) was used as a highly sensitive electrochemical sensor for determination of trace amounts of atenolol. the oxidation peak potentials in cyclic voltammogram of adafcnte occurred around 550 mv vs ag/agcl (at ph 6.0) while this peak potentia...

In this paper, the effects of infiltration of La2NiO4 (LNO) as a mixed ionic and electronic conductor (MIEC) on the electrochemical performance of porous strontium doped lanthanum manganite (LSM) oxygen electrode of solid oxide cells, in the temperature ranges of 650-850 °C, is reported. XRD and FE-SEM results of the LNO sample calcined at 900 °C confirmed the formation of single phase LNO nano...

A new type of optically transparent electrode is fabricated using template-stripped gold film whose surface shows highly oriented, atomically flat terraces and steps. The electrode indicates typical Au(111) electrochemical properties and stability for spectroelectrochemical measurements.

Electrochemical techniques rely on the stability of a defined reference potential. Due to the need for miniaturization, electrochemical lab-on-a-chip platforms often employ Ag/AgCl quasi-reference electrodes for this purpose. Here, we report on electrochemical artifacts resulting from nanoparticle-electrode collisions originating from standard chlorinated silver wires.

An ultrasensitive electrochemical enzyme immunoassay (EEIA) for the detection of proteins on an 8x8 array is described. The assay is based on wired enzyme technology. Briefly, capture antibody was covalently immobilized on a self-assembled 11-mercaptoundecanoic acid (MUA) monolayer coated gold electrode. After incubating with a target protein (antigen), the gold electrode was treated sequential...

Electrochemical behaviors of methocarbamol (MET) at the bare carbon paste electrode (CPE), acetylene black (AB) modified carbon paste electrode (AB/CPE), an ionic liquid 1-Benzyl-3Methylimidazole hexafluorophosphate ([BnMIM]PF6) modified carbon paste electrode ([BnMIM]PF6/ CPE) and AB-[BnMIM]PF6 modified carbon paste electrode (AB-[BnMIM]PF6/CPE) in PBS (pH = 6.8) were investigated by cyclic vo...

miRNAs have emerged as new biomarkers for the detection of a wide variety of cancers. By employing duplex-specific nuclease for signal amplification and gold nanoparticles (AuNPs) as the carriers of detection probes, a novel electrochemical assay of miRNAs was performed. The method is based on conversion of the well-known colorimetric assay into electrochemical analysis with enhanced sensitivit...

In this work, a novel sol-gel-based procedure to obtain solid carbon composite electrodes is proposed. The procedure is based on the use of sonocatalysis to apply high-energy ultrasound directly to the precursors; this way, ultrasonic cavitation is achieved so that hydrolysis with acidic water is promoted in the absence of any additional solvent and the time needed to get a unique phase is redu...