We describe the synthesis of zinc oxide (ZnO) nanoparticles and demonstrate their attachment to m... more 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.
... Interaction of Cr(VI) with activated charcoal obtained from biomass. Anup Kumar Deb, M ShahMi... more ... Interaction of Cr(VI) with activated charcoal obtained from biomass. Anup Kumar Deb, M ShahMiran, M Yousuf A Mollah. Abstract. Keywords: biomass; wastewater; chromium; activated charcoal. Bangladesh J. Sci. Res. 23(1): 1-10, 2010 (June). Refbacks. ...
Zinc oxide (ZnO) nanostructures are ideal materials for biosensing applications due to their desi... more Zinc oxide (ZnO) nanostructures are ideal materials for biosensing applications due to their desireable properties, such as having a relatively high cond., wide band gap, high exciton binding energy, fast electron transfer characteristics, and ease of prepn. In this study, ZnO multiwalled carbon nanotube (MWNT) composites were synthesized using a 90°C hydrothermal treatment prior to sonochem. attachment to carboxylic acid functionalized MWNTs, which were then incorporated onto glassy carbon electrodes (GCE) for potentiometric measurements. The material was effective for selective detection of uric acid (UA), acetaminophen (APAP), and hydrogen peroxide (H2O2). Electrochem. oxidn./redn. peaks in the cyclic voltammetry (CV) for UA, APAP, and H2O2 were obsd. at potentials of +0.44, +0.49, and -0.36 V, resp. Linear response in the 0.1 to 20 mM concn. range of analyte was obsd.
We describe the synthesis of zinc oxide (ZnO) nanoparticles and demonstrate their attachment to m... more 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.
... Interaction of Cr(VI) with activated charcoal obtained from biomass. Anup Kumar Deb, M ShahMi... more ... Interaction of Cr(VI) with activated charcoal obtained from biomass. Anup Kumar Deb, M ShahMiran, M Yousuf A Mollah. Abstract. Keywords: biomass; wastewater; chromium; activated charcoal. Bangladesh J. Sci. Res. 23(1): 1-10, 2010 (June). Refbacks. ...
Zinc oxide (ZnO) nanostructures are ideal materials for biosensing applications due to their desi... more Zinc oxide (ZnO) nanostructures are ideal materials for biosensing applications due to their desireable properties, such as having a relatively high cond., wide band gap, high exciton binding energy, fast electron transfer characteristics, and ease of prepn. In this study, ZnO multiwalled carbon nanotube (MWNT) composites were synthesized using a 90°C hydrothermal treatment prior to sonochem. attachment to carboxylic acid functionalized MWNTs, which were then incorporated onto glassy carbon electrodes (GCE) for potentiometric measurements. The material was effective for selective detection of uric acid (UA), acetaminophen (APAP), and hydrogen peroxide (H2O2). Electrochem. oxidn./redn. peaks in the cyclic voltammetry (CV) for UA, APAP, and H2O2 were obsd. at potentials of +0.44, +0.49, and -0.36 V, resp. Linear response in the 0.1 to 20 mM concn. range of analyte was obsd.
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