Sensitive electrochemical detection of enrofloxacin in eggs based on carboxylated multi-walled carbon nanotubes-reduced graphene oxide nanocomposites: Molecularlyimprintedrecognition versus direct electrocatalytic oxidation.

A sensitive electrochemical method for detecting enrofloxacin was proposed using carboxylated multi-walled carbon nanotubes-reduced graphene oxide (MWCNT-COOH-RGO) nanocomposites. The MWCNT-COOH-RGO nanocomposites were firstly electrodeposited on a bare electrode, followed by electropolymerization of molecularly imprinted polymers. Enrofloxacin was determined by the mechanisms of direct electrocatalytic oxidation and molecularly imprinted recognition, respectively.

Highly sensitive detection of fluoride based on poly(3-aminophenylboronic acid)-reduced graphene oxide multilayer modified electrode.

A novel electrochemical method for detecting fluoride was developed based on gold electrode modified by layer-by-layer (LBL) assembly of poly(3-aminophenylboronic acid)-reduced graphene oxide (PAPBA-RGO) multilayers. The PAPBA-RGO multilayer-modified gold electrode was constructed by using alternating LBL assembly of RGO and PAPBA on a bare gold electrode by one-step electrodeposition. Fluoride was electrochemically determined based on the proposed modified electrode by evaluating the changes in peak current for potassium ferricyanide reduction caused by the conjunction of fluoride and boronic acid groups of PAPBA.

A novel biosensor array with a wheel-like pattern for glucose, lactate and choline based on electrochemiluminescence imaging.

Electrochemiluminescence (ECL) imaging provides a superior approach to achieve array detection because of its ability for ultrasensitive multiplex analysis. In this paper, we reported a novel ECL imaging biosensor array modified with an enzyme/carbon nanotubes/chitosan composite film for the determination of glucose, choline and lactate. The biosensor array was constructed by integrating a patterned indium tin oxide (ITO) glass plate with six perforated poly(dimethylsiloxane) (PDMS) covers.

Integrating bipolar electrochemistry and electrochemiluminescence imaging with microdroplets for chemical analysis.

Here we develop a microdroplet sensor based on bipolar electrochemistry and electrochemiluminescence (ECL) imaging. The sensor was constructed with a closed bipolar cell on a hybrid poly(dimethylsioxane) (PDMS)-indium tin oxide (ITO) glass microchip. The ITO microband functions as the bipolar electrode and its two poles are placed in two spatially separate micro-reservoirs predrilled on the PDMS cover.

Proton-coupled O2 reduction reaction catalysed by cobalt phthalocyanine at liquid/liquid interfaces.

Pushed over the edge: Proton-transfer coupled O(2) reduction catalysed by cobalt phthalocyanine ([CoPc]) was studied at the water/1,2-dichloroethane (DCE) interface (see figure). This system represents a new model of molecular electrocatalysis with the proton transfer controlled by the Galvani potential difference and the electron transfer by the molecular properties of the catalyst and electron donor.

Microfluidic droplet-based liquid/liquid extraction modulated by the interfacial Galvani potential difference.

With a microfluidic droplet-based liquid/liquid extraction setup, we demonstrate that the extraction of an ionic analyte from complex matrices can be modulated by the interfacial Galvani potential difference and the extraction equilibrium follows the classical Nernst equation.

Mode-filtered light methane gas sensor based on cryptophane A.

A mode-filtered light sensor has been developed for methane (CH(4)) gas determination at ambient conditions. The proposed chemosensor consisted of an annular column which was constructed by inserting an optical fiber coated with a thin silicone cladding of cryptophane A into a fused-silica capillary. When CH(4) was introduced to the sensor, selective inclusion of CH(4) into the silicone layer would cause a change in the local refractive index of the cladding, resulting in the change of mode-filtered light that emanated from the fiber.