电化学石英晶体微天平研究普鲁士蓝修饰电极

石英晶体徽天平(Quartz Crystal Microbalance,简称QCM)是一种非常灵敏的质量传感器,其检测能力可达ng级。QCM在化学中的早期应用是检测大气中的徽量成分,目前仍较活跃。由于石英压电晶体浸入溶液后在晶体/溶液界面存在较大的能量损失而不能够稳定振荡,致使QCM的应用较长时间局限于气相。八十年代初石英压电晶体在液相中的振荡终获成功,开辟了QCM应用的一个全新领域。液相中振荡成功后,QCM很快应用于电化学研究。目前已发展成为一种全新的电化学传感器——电化学石英晶体微天平(EQCM),并已用于金属电沉积、电化学腐蚀、电分析等方面的研究。

Studies on Prussian Blue Modified Electrode by Quartz Crystal Microbalance

A film of Prussian blue (PB) was electrochemically deposited on a quartz crystal microbal-ance (QCM). The forming of the PB film was monitored in situ by the frequency shift of QCM, the PB film is an electroactive polymer film, during reduction of the film and subsequent reoxidation to PB, cation transport in and out of the film. This changes the total mass of the polymer film and alters the frequency of the QCM. From the frequency changes of the QCM, we found that K+ , Na+ , NH4+ can migrate in and out of the film easily, but it is difficult for Ca2+ to entet the film.