Novel two-step process for the fabrication of MnO2 nanostructures on tantalum for enhanced electrochemical H2O2 detection
| Autor: | A. Monamary, A. Renitta, K. Vijayalakshmi, K. Alagusundaram |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Nanostructure Nanowire Tantalum Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Crystallinity Adsorption Chemical engineering chemistry Electrode Hydrothermal synthesis General Materials Science 0210 nano-technology |
| Zdroj: | Materials Chemistry and Physics. 214:431-439 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2018.04.108 |
| Popis: | We demonstrate the influence of MnO2 nanostructures on the H2O2 sensing performance. A novel two-step process using hydrothermal synthesis and spray pyrolysis deposition was used to fabricate the MnO2/Ta sensor electrode. First, different MnO2 nanostructures were synthesized by temperature controlled autoclave-hydrothermal processing through the manipulation of Mn concentration. The MnO2 nanoparticles revealed preferentially oriented (101) peak with high intensity. The absorption bands at 760-375 cm−1 confirmed the coupling between Mn-O stretching modes of tetrahedral and octahedral sites. SEM images revealed the formation of horn-like MnO2 nanowires and nanoflakes with good crystallinity. The MnO2 nanoflakes synthesized with 3 at.% Mn exhibit needle like morphology at the edge of nano-architecture, favorable for remarkable electrochemical properties and stability. Next, the MnO2 nanostructures were transferred onto Ta electrode by a novel spray deposition to form a multi-terminal network H2O2 adsorption layer. The 3D nanoflakes like MnO2/Ta electrode revealed a very low detection limit of 0.06 μM towards H2O2, with insignificant responses for interfering compounds. The sensor also displayed good recovery >95% when tested in milk samples. |
| Databáze: | OpenAIRE |
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