scholarly journals Nanocomposites of Graphene with Ferrocene or Hemin: Preparation and Application in Electrochemical Sensing

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Ning Xia ◽  
Lin Liu ◽  
Zhifang Sun ◽  
Binbin Zhou
Keyword(s):  
Electrochemical Sensing ◽  
Electrochemical Energy Storage ◽  
Electrochemical Performances ◽  
Functionalized Graphene ◽  
Graphene Nanocomposites ◽  
Redox States ◽  
Electroactive Materials ◽  
Organic Complexes ◽  
Physicochemical And Structural Properties ◽  
First Time

Graphene has sparked tremendous interests across many fields such as biosensors, electrochemical energy storage, and electronics due to its extraordinary physicochemical and structural properties. The redox mediator-functionalized graphene composites may obtain highly electroactive materials with better conductivity, dispersion, and compatibility. Ferrocene and hemin, two iron-organic complexes, are the well-known mediators in view of their various properties, including reversibility, regeneration at low potential, and generation of stable redox states. Recently, it has been demonstrated that the use of ferrocene or hemin coupled with graphene can further improve the electrochemical performances of the developed sensors. In this contribution, we, for the first time, reviewed the preparation and applications of ferrocene/graphene and hemin/graphene nanocomposites in electrochemical sensing.

scholarly journals A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

2020 ◽  
Vol 9 (1) ◽  
pp. 760-767 ◽  
Author(s):  
Seyed Morteza Naghib ◽  
Farahnaz Behzad ◽  
Mehdi Rahmanian ◽  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Current Response ◽  
Functionalized Graphene ◽  
Serum Samples ◽  
Promising Candidate ◽  
Graphene Nanocomposites ◽  
Selective Determination ◽  
Highly Sensitive

AbstractFunctionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

Mesoporous CuO–ZnO p–n heterojunction based nanocomposites with high specific surface area for enhanced photocatalysis and electrochemical sensing

2016 ◽  
Vol 6 (9) ◽  
pp. 3238-3252 ◽  
Author(s):  
Sumit Chabri ◽  
Arnab Dhara ◽  
Bibhutibhushan Show ◽  
Deepanjana Adak ◽  
Arijit Sinha ◽  
...  
Keyword(s):  
Solid State ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Electrochemical Sensing ◽  
Solid State Reactions ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Microstructural Refinement

Mesoporous and core–shell like (p)CuO–(n)ZnO nanocomposites were prepared using microstructural refinement and solid state reactions, which showed enhanced photochemical and electrochemical performances.

An intrinsically stretchable and compressible Zn–air battery

2020 ◽  
Vol 56 (35) ◽  
pp. 4793-4796 ◽  
Author(s):  
Yueyang Wang ◽  
Jie Liu ◽  
Yuping Feng ◽  
Ningyuan Nie ◽  
Mengmeng Hu ◽  
...  
Keyword(s):  
Rechargeable Battery ◽  
Electrochemical Performances ◽  
Air Battery ◽  
First Time

An intrinsically 300% stretchable and 85% compressible Zn–air rechargeable battery with good electrochemical performances was fabricated for the first time.

Organic quinones towards advanced electrochemical energy storage: recent advances and challenges

2019 ◽  
Vol 7 (41) ◽  
pp. 23378-23415 ◽  
Author(s):  
Cuiping Han ◽  
Hongfei Li ◽  
Ruiying Shi ◽  
Tengfei Zhang ◽  
Jing Tong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrochemical Energy Storage ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electroactive Materials ◽  
Recent Advances ◽  
Electrochemical Energy

This review provides an up-to-date summary of the progress of organic quinones as electroactive materials for advanced electrochemical energy storage devices.

scholarly journals Morphology–Dependent Electrochemical Sensing Properties of Iron Oxide–Graphene Oxide Nanohybrids for Dopamine and Uric Acid

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 835 ◽  
Author(s):  
Zhaotian Cai ◽  
Yabing Ye ◽  
Xuan Wan ◽  
Jun Liu ◽  
Shihui Yang ◽  
...  
Keyword(s):  
Uric Acid ◽  
Graphene Oxide ◽  
Iron Oxide ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Simultaneous Detection ◽  
Electrochemical Sensing ◽  
Electrochemical Performances ◽  
Hydrothermal Route ◽  
Sensing Properties

Various morphologies of iron oxide nanoparticles (Fe2O3 NPs), including cubic, thorhombic and discal shapes were synthesized by a facile meta-ion mediated hydrothermal route. To further improve the electrochemical sensing properties, discal Fe2O3 NPs with the highest electrocatalytic activity were coupled with graphene oxide (GO) nanosheets. The surface morphology, microstructures and electrochemical properties of the obtained Fe2O3 NPs and Fe2O3/GO nanohybrids were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. As expected, the electrochemical performances were found to be highly related to morphology. The discal Fe2O3 NPs coupled with GO showed remarkable electrocatalytic activity toward the oxidation of dopamine (DA) and uric acid (UA), due to their excellent synergistic effect. The electrochemical responses of both DA and UA were linear to their concentrations in the ranges of 0.02–10 μM and 10–100 μM, with very low limits of detection (LOD) of 3.2 nM and 2.5 nM for DA and UA, respectively. Moreover, the d-Fe2O3/GO nanohybrids showed good selectivity and reproducibility. The proposed d-Fe2O3/GO/GCE realized the simultaneous detection of DA and UA in human serum and urine samples with satisfactory recoveries.

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