Faculty of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russia.
Beilstein J Nanotechnol. 2013 Oct 14;4:649-54. doi: 10.3762/bjnano.4.72. eCollection 2013.
We report here a way for improving the stability of ultramicroelectrodes (UME) based on hexacyanoferrate-modified metals for the detection of hydrogen peroxide. The most stable sensors were obtained by electrochemical deposition of six layers of hexacyanoferrates (HCF), more specifically, an alternating pattern of three layers of Prussian Blue and three layers of Ni-HCF. The microelectrodes modified with mixed layers were continuously monitored in 1 mM hydrogen peroxide and proved to be stable for more than 5 h under these conditions. The mixed layer microelectrodes exhibited a stability which is five times as high as the stability of conventional Prussian Blue-modified UMEs. The sensitivity of the mixed layer sensor was 0.32 A·M(-1)·cm(-2), and the detection limit was 10 µM. The mixed layer-based UMEs were used as sensors in scanning electrochemical microscopy (SECM) experiments for imaging of hydrogen peroxide evolution.
我们在此报告了一种改进基于铁氰化亚铁修饰金属的超微电极（UME）稳定性的方法，用于检测过氧化氢。最稳定的传感器是通过电化学沉积 6 层铁氰化亚铁（HCF）获得的，更具体地说，是交替沉积三层普鲁士蓝和三层 Ni-HCF。在 1mM 过氧化氢中，修饰有混合层的微电极被连续监测，在这些条件下证明稳定超过 5 小时。混合层微电极的稳定性是传统普鲁士蓝修饰 UME 的稳定性的五倍。混合层传感器的灵敏度为 0.32 A·M(-1)·cm(-2)，检测限为 10µM。基于混合层的 UME 被用作扫描电化学显微镜（SECM）实验中的传感器，用于成像过氧化氢的产生。
