Chemistry and Material Science faculties of M.V. Lomonosov Moscow State University, 119991, Moscow, Russia.
Anal Chem. 2011 Mar 15;83(6):2359-63. doi: 10.1021/ac1033352. Epub 2011 Feb 24.
We report on a superstable hydrogen peroxide (H(2)O(2)) transducer made by sequential deposition of the iron- and nickel-hexacyanoferrate (NiHCF) layers. Both chemical and mechanical stability of the latter, as well as similarity of its structure to Prussian Blue (PB) provide a substantial stabilization of the most advantageous H(2)O(2) transducer. The electrochemically deposited five bilayers of PB-NiHCF exhibit a complete stability under the continuous wall-jet flow of 1 mM of H(2)O(2) during more than 2 h, maintaining current at a level of 0.2 mA cm(-2), whereas common Prussian Blue loses half of its response within the first 20-25 min. Even being deposited in the open circuit regime on screen-printed electrodes, PB-NiHCF bilayers dramatically improve tolerance of the resulting transducer to alkaline solutions and iron ligands. Despite their 2-2.5 times decreased sensitivity (compared to common Prussian Blue), the sequentially deposited bilayers of PB-NiHCF provide a similar dynamic range of the transducer due to the decreased noise level.
我们报告了一种通过顺序沉积铁和镍六氰合铁酸盐（NiHCF）层制备的超稳定过氧化氢（H2O2）传感器。后者的化学和机械稳定性以及其结构与普鲁士蓝（PB）的相似性为最有利的 H2O2 传感器提供了实质性的稳定。电化学沉积的 PB-NiHCF 五层膜在连续壁流 1mM H2O2 下超过 2 小时完全稳定，电流保持在 0.2 mA cm-2 水平，而普通普鲁士蓝在最初的 20-25 分钟内失去一半响应。即使在丝网印刷电极上以开路模式沉积，PB-NiHCF 双层膜也极大地提高了所得传感器对碱性溶液和铁配体的耐受性。尽管与普通普鲁士蓝相比，灵敏度降低了 2-2.5 倍，但由于噪声水平降低，顺序沉积的 PB-NiHCF 双层膜提供了类似的传感器动态范围。
