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We first reported that polyvinylpyrrolidone-protected graphene was dispersed well in water and had good electrochemical reduction toward O2 and H2O2. With glucose oxidase (GOD) as an enzyme model, we constructed a novel polyvinylpyrrolidone-protected graphene/polyethylenimine-functionalized ionic liquid/GOD electrochemical biosensor, which achieved the direct electron transfer of GOD, maintained its bioactivity and showed potential application for the fabrication of novel glucose biosensors with linear glucose response up to 14 mM.

Direct Electrochemistry of Glucose Oxidase and Biosensing for Glucose Based on Graphene

Platinum-based nanostructured materials: synthesis, properties, and applications.

Potential applications of enzymes immobilized on/in nano materials: A review

Fluorescent Dyes and Their Supramolecular Host/Guest Complexes with Macrocycles in Aqueous Solution Roy N. Dsouza, Uwe Pischel,* and Werner M. Nau* School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany Centro de Investigaci on en Química Sostenible (CIQSO) and Departamento de Ingeniería Química, Química Física y Química Org anica, Universidad de Huelva, Campus de El Carmen s/n, E-21071 Huelva, Spain

Fluorescent dyes and their supramolecular host/guest complexes with macrocycles in aqueous solution.

n-Type semi-conductive nanometer material MgFe2O4 was synthesized by solid-state reaction of inorganic reagents MgSO4, Fe(NO3)3·9H2O, and NaOH. The process was a convenient, environment friendly, inexpensive and efficient preparation method for MgFe2O4 nanomaterial. X-ray diffraction (XRD) was used to confirm the material structure and transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) to depict the crystallite microstructure. Conductance responses of the nanocrystalline MgFe2O4 thick film were measured by exposing the film to reducing gases like methane (CH4), hydrogen sulfide (H2S), liquefied petroleum gas (LPG) and ethanol gas (C2H5OH). It was found that the sensor exhibited various sensing responses to these gases at different operating temperature. Furthermore, the sensor exhibited a fast response and a good recovery. Successive on and off responses could be repeated without observing major changes in the response signal.

Simple synthesis of MgFe2O4 nanoparticles as gas sensing materials

http://nathan.instras.com/ResearchProposalDB/doc-60.pdf

Platinum nanoparticles-doped sol-gel/carbon nanotubes composite electrochemical sensors and biosensors.

A mediator-free phenol biosensor based on immobilizing tyrosinase to ZnO nanoparticles

Amperometric glucose biosensor based on a surface treated nanoporous ZrO2/Chitosan composite film as immobilization matrix

Horseradish peroxidase (HRP) to a nano-Au monolayer, which was supported by PAMAM dendrimer/cystamine modified gold electrode. The high affinity of PAMAM dendrimer for nano-Au with its amine groups was used to realize the role of nano-Au as an intermediator to retain the high bioactivity of HRP. A hydrogen peroxide biosensor was fabricated based on the effective immobilization of the high bioactivity of HRP. In the presence of the hydroquinone mediator in the solution, the immobilized HRP exhibited excellent electrocatalytical response to the reduction of H 2 O 2 . The effects of various experimental variables were optimized. The resulting biosensor showed a linear response to H 2 O 2 over a concentration range from 1 × 10 −5 to 2.5 × 10 −3  mol L −1 with a sensitivity of 0.53 A L mol −1  cm −2 and a detection limit of 2.0 μmol L −1 based on a signal-to-noise ratio of 3. The apparent Michaelis-Menten constant ( K m app ) of the biosensor was evaluated to be 0.52 mmol L −1 . The biosensor exhibited high sensitivity and good stability and reproducibility. Performance of the biosensor was evaluated with respect to possible interferences and the application to real sample analysis.

Yan-Li Liu

Papers

Simple synthesis of MgFe2O4 nanoparticles as gas sensing materials

Platinum nanoparticles-doped sol-gel/carbon nanotubes composite electrochemical sensors and biosensors.

A mediator-free phenol biosensor based on immobilizing tyrosinase to ZnO nanoparticles

Amperometric glucose biosensor based on a surface treated nanoporous ZrO2/Chitosan composite film as immobilization matrix

A hydrogen peroxide biosensor based on nano-Au/PAMAM dendrimer/cystamine modified gold electrode