Piezoelectric sensor functionalised by a self-assembled bipyridinium derivative: characterisation and preliminary applications in the detection of heavy metal ions
Piezoelectric sensor functionalised by a self-assembled bipyridinium derivative: characterisation and preliminary applications in the detection of heavy metal ions
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DOI：
10.1016/j.bios.2004.04.028
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发表时间：
2004-12-15
影响因子：
12.6
通讯作者：
Valli, L
中科院分区：
文献类型：
--
作者：
Casilli, S;Malitesta, C;Valli, L
成功地合成了一种分子1-（11-十二烷硫基-十一烷基）-[4，4 ']联吡啶溴化物（1），它既能与压电石英晶体的金电极形成共价键，又能与水溶液中的重金属离子相互作用。商业石英晶体微天平仪器已被修改，以进行流动注射分析。该系统的行为遵循金泽-戈登方程所示的葡萄糖溶液的测量。在感测测试之前和之后，通过原子力显微镜表征了1在金电极上的自组装层。通过检测水溶液中铅、镉、汞等重金属离子引起的频率变化，研究了修饰金电极的传感性能。探索的浓度范围为10（-4）至10（-2）M，相应的频率变化范围为10至50 Hz。观察到的所有反应均快速、可重现且可逆。特别是，与其他分析物相比，对汞的响应明显更高。据我们所知，这一贡献代表了基于联吡啶受体的传感层的第一个例子，显示出可逆的，在一定程度上，对重金属离子的差异化响应。(C)2004 Elsevier B. V.保留所有权利。
The synthesis of a molecule, 1-(11-dodecylsulfanyl-undecyl)-[4,4']bipyridinium bromide (1), suitable at the same time to form a covalent bond with gold electrodes of a piezoelectric quartz crystal and to interact with heavy metal ions in aqueous solutions, has been successfully accomplished. A commercial quartz crystal microbalance instrument has been modified in order to perform a Flow-Injection Analysis. The behaviour of the system follows the Kanazawa-Gordon equation as demonstrated by measurements with glucose solutions. The self-assembled layer of 1 onto a gold electrode has been characterised by Atomic Force Microscopy before and after the sensing tests. The sensing performances of the modified gold electrode were investigated by monitoring the frequency variation induced by the presence of heavy metal ions, such as lead, cadmium and mercury, in aqueous media. The explored concentrations ranged between 10(-4) and 10(-2) M and the corresponding frequency variations ranged between 10 and 50 Hz. All responses observed were fast, reproducible and reversible. In particular, the response to mercury appears significantly higher in comparison with the other analytes. To the best of our knowledge, this contribution represents the first example of sensing layer based on bipyridinium receptor showing reversible and, at some extent, differentiated response towards heavy metal ions. (C) 2004 Elsevier B.V. All rights reserved.