Morphology of hydrothermally synthesized ZnO nanoparticles tethered to carbon nanotubes affects electrocatalytic activity for H2O2 detection.

We describe the synthesis of zinc oxide (ZnO) nanoparticles and demonstrate their attachment to multiwalled carbon tubes, resulting in a composite with a unique synergistic effect. Morphology and size of ZnO nanostructures were controlled using hydrothermal synthesis, varying the hydrothermal treatment temperature, prior to attachment to carboxylic acid functionalized multi-walled carbon nanotubes for sensing applications. A strong dependence of electrocatalytic activity on nanosized ZnO shape was shown. High activity for H2O2 reduction was achieved when nanocomposite precursors with a roughly semi-spherical morphology (no needle-like particles present) formed at 90 °C. A 2.4-fold increase in cyclic voltammetry current accompanied by decrease in overpotential from the composites made from the nanosized, needle-like-free ZnO shapes was observed as compared to those composites produced from needle-like shaped ZnO. Electrocatalytic activity varied with pH, maximizing at pH 7.4. A stable, linear response for H2O2 concentrations was observed in the 1-20 mM concentration range.

[1]  V. Gladyshev,et al.  Hydrogen Peroxide Probes Directed to Different Cellular Compartments , 2011, PloS one.

[2]  C. Dong,et al.  Electrochemical Behavior of Hydrogen Peroxide at a Glassy Carbon Electrode Modified with Nickel Hydroxide–Decorated Multiwalled Carbon Nanotubes , 2008 .

[3]  A. Turco,et al.  A new amperometric nanostructured sensor for the analytical determination of hydrogen peroxide. , 2008, Biosensors & bioelectronics.

[4]  Guangfeng Wang,et al.  A novel hydrazine electrochemical sensor based on a carbon nanotube-wired ZnO nanoflower-modified electrode , 2009 .

[5]  A. Merkoçi.  Carbon Nanotubes in Analytical Sciences , 2006 .

[6]  Wei Zhang,et al.  Hydrogen peroxide biosensor based on gold nanoparticles/thionine/gold nanoparticles/multi-walled carbon nanotubes–chitosans composite film-modified electrode , 2012 .

[7]  Song Li,et al.  Enzyme-free amperometric sensing of hydrogen peroxide and glucose at a hierarchical Cu2O modified electrode. , 2011, Talanta.

[8]  Yong Liu,et al.  A third-generation hydrogen peroxide biosensor based on horseradish peroxidase immobilized on DNA functionalized carbon nanotubes. , 2009, Biosensors & bioelectronics.

[9]  Jung-Min You,et al.  Electrocatalytic reduction of H2O2 by Pt nanoparticles covalently bonded to thiolated carbon nanostructures , 2012 .

[10]  Erkang Wang,et al.  Self-assembly of cationic polyelectrolyte-functionalized graphene nanosheets and gold nanoparticles: a two-dimensional heterostructure for hydrogen peroxide sensing. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[11]  P. Scheurich,et al.  Nanotube Action between Human Mesothelial Cells Reveals Novel Aspects of Inflammatory Responses , 2011, PloS one.

[12]  Baoping Zhang,et al.  Characteristics of ZnO whiskers prepared from organic-zinc , 2003 .

[13]  Ce Wang,et al.  Fabrication of ternary CNT/PPy/KxMnO2 composite nanowires for electrocatalytic applications. , 2012, Talanta.

[14]  Changle Wu,et al.  A novel chemical route to prepare ZnO nanoparticles , 2006 .

[15]  Y. Xing,et al.  Pt Nanoparticle Binding on Functionalized Multiwalled Carbon Nanotubes , 2006 .

[16]  T. Ohsaka,et al.  Cathodic detection of H2O2 using iodide-modified gold electrode in alkaline media. , 2006, Analytical chemistry.

[17]  Yunhui Yang,et al.  Hydrogen peroxide biosensor based on electrodeposition of zinc oxide nanoflowers onto carbon nanotubes film electrode , 2008 .

[18]  H. Riella,et al.  SINTHESYS OF ZnO NANOSTRUCTURES IN LOW REACTION TEMPERATURE , 2009 .

[19]  L. Gorton,et al.  Prussian-Blue-based amperometric biosensors in flow-injection analysis. , 1996, Talanta.

[20]  Yasuyuki Sakai,et al.  Electrochemical biosensor for the detection of H2O2 from living cancer cells based on ZnO nanosheets. , 2010 .

[21]  E. Suh,et al.  Low temperature synthesis and characterization of rosette-like nanostructures of ZnO using solution process , 2009 .

[22]  Huangxian Ju,et al.  Amperometric biosensor for hydrogen peroxide based on ferrocene-bovine serum albumin and multiwall carbon nanotube modified ormosil composite. , 2006, Biosensors & bioelectronics.

[23]  Y. Ying,et al.  An amperometric sensor based on Prussian blue and poly(o-phenylenediamine) modified glassy carbon electrode for the determination of hydrogen peroxide in beverages. , 2011, Food chemistry.

[24]  Caofeng Pan,et al.  Highly Sensitive Amperometric Cholesterol Biosensor Based on Pt-Incorporated Fullerene-like ZnO Nanospheres , 2010 .