One-pot hydrothermal synthesis of uniform β-MnO₂ nanorods for nitrite sensing

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• 作者：Jiu-Ju Feng^a ; ^b ; Pei-Pei Zhang^b ; Ai-Jun Wang^a ; ^b ; ^{ajwangnju@gmail.com"" rel=""nofollow} ; Yan Zhang^b ; Wen-Ju Dong^b ; Jian-Rong Chen^a
• 关键词：Hydrothermal ; Manganese dioxide ; Nanorods ; Nitrite ; Sensor
• 刊名：Journal of Colloid and Interface Science
• 出版年：2011
• 出版时间：1 July 2011
• 年：2011
• 卷：359
• 期：1
• 页码：1-8
• 全文大小：1513 K

文摘

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 ± 20 nm and a length up to 1.2 ± 0.2 μm. 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 0.29 μM to 26.09 mM (R = 0.9986), high sensitivity (1.21 μA mM⁻¹, S/N = 3), low detection limit (0.29 μM), and fast response (less than 5 s).