Nafion - Tris(2-2'-bipyridyl)ruthenium(II) ultrathin Langmuir - Schaefer films: Redox catalysis and electrochemiluminescent properties
Nafion - Tris(2-2'-bipyridyl)ruthenium(II) ultrathin Langmuir - Schaefer films: Redox catalysis and electrochemiluminescent properties
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DOI：
10.1021/ac070811m
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发表时间：
2007-10-01
影响因子：
7.4
通讯作者：
Unwin, Patrick R.
中科院分区：
文献类型：
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作者：
Bertoncello, Paolo;Dennany, Lynn;Unwin, Patrick R.
介绍了一种简单的将三(2-2‘-联吡啶)Ru(II)，[Ru(Bpy)(3)](2+)掺杂到Nafion Langmuir-Schaefer(LS)薄膜中的方法。Nafion-[Ru(Bpy)(3)](2+)-[Ru(Bpy)(3)](2+)Langmuir膜直接在石英玻璃和氧化铟(ITO)衬底上形成了几十纳米厚的Nafion LS膜。这一过程允许将[Ru(Bpy)(3)](2+)直接结合到Nafion薄膜中，而不需要随后的负载。UV-Vis光谱证实了[Ru(Bpy)(3)](2+)被成功地掺入到LS膜中，并表明以这种方式固定化的[Ru(Bpy)(3)](2+)的量随膜厚的变化而变化。ITO修饰电极的伏安研究证实了[Ru(Bpy)(3)](2+)的成功掺入，并证明了[Ru(Bpy)(3)](2+)在超薄膜中保留了很长时间。测试了这些电极对三丙胺的电催化还原性能。由于超薄膜尺寸的直接结果，[Ru(Bpy)(3)](2+/3+)在电极表面和膜外边界之间的快速翻转，观察到了显著的催化作用。伴随的电化学发光(ECL)突出了这种材料在传感应用方面的潜力。
A simple procedure to incorporate tris(2-2'-bipyridyl)ruthenium(II), [Ru(bPY)(3)](2+), into Nafion Langmuir-Schaefer (LS) films is described. Nafion LS films (tens of nanometers thick) were formed on quartz glass and indium tin oxide (ITO) directly from Nafion-[Ru(bPY)(3)](2+) Langmuir films assembled at the water-air interface. This procedure allowed the direct incorporation of [Ru(bPY)(3)](2+) into Nafion films without the need for subsequent loading. UV-vis spectroscopy confirmed the successful incorporation of [Ru(bPY)(3)](2+) within the LS films and showed that the amount of [Ru(bPY)(3)](2+) immobilized in this way scaled with film thickness. Voltammetric studies on ITO-modified electrodes confirmed the successful incorporation of [Ru(bPY)(3)](2+) and demonstrated that [Ru(bPY)(3)](2+) was retained within the ultrathin films over a long time scale. These electrodes were tested for the electrocatalytic reduction of tripropylamine. Significant catalysis was observed due to the rapid turnover of [Ru(bPY)(3)](2+/3+) between the electrode surface and outer boundary of the film, as a direct consequence of the ultrathin film dimensions. Concomitant electrochemiluminescence (ECL) was demonstrated highlighting the potential of this material for sensing applications.