The absorption behavior of bilirubin on nanocrystal CdSe was investigated in detail using quartz crystal microbalance (QCM). The adsorption kinetic parameters estimated from the in situ frequency measurement is (1.5 ± 0.32)×106 M-1(mean ± S.D).with the present method, Impedance characteristic of CdSe suspension and response of the Piezoelectric crystal Impedance (PCI)sensor were detailedly analysed. It was found that the adsorption of bilirubin on the surface of CdSe electrodes strongly depended on a few influencing factors such as pH,solution concentration temperature,and solution ionicstrength.The results indicate the amount of adsorbed bilirubin increased with increasing of hydroxyl ions, bilirubin concentration and higher solution ionic strength, but small at higher temperature. The sensors based on the CdSe microlavers show especial sensitive to bilirubin. QCM measurement provides a facile method for monitoring the adsoption/desorption process of bilirubin on nanocrystalline CdSe.%用石英微天平技术详细研究了胆红素在纳米CdSe晶体表面上的吸附行为.从频率测试中得出的吸附动力学参数约是(1.5±0.32)×106 M-1(平均数±相对误差).此法细致研究了CdSe悬浮液的阻抗性能和压电性能.实验中发现胆红素在CdSe纳米晶上的吸附作用受体系温度、pH和离子强度等因素影响:较高温度不利于胆红素的吸收,但随着pH、离子强度和胆红素浓度的增大胆红素的吸附量明显增大.研究表明基于CdSe纳米组装的传感器对胆红素十分敏感.此技术为分析胆红素在CdSe纳米拓扑界面的吸附与解吸机制提供了有效的方法.
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