Abstract
A simple hydrothermal method was developed for the synthesis of uniform single-crystal β-MnO2 nanorods only using potassium permanganate and sodium nitrite in acidic solution, without any seed or template. The as-prepared β-MnO2 nanorods have the average diameter of 300±20nm and a length up to 1.2±0.2μm. Moreover, the effects of pH, temperature, and reactant molar ratios on the morphology of the final product were studied in detail. In addition, the catalytic ability of the as-prepared β-MnO2 nanorods was tested for the electrooxidation of nitrite. The resulting sensor showed a wide linear range from 0.29μM to 26.09mM (R=0.9986), high sensitivity (1.21μAmM−1, S/N=3), low detection limit (0.29μM), and fast response (less than 5s).
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