Abstract
Love mode surface acoustic wave (SAW) immunosensors were developed. The Love mode guiding layers in these sensors are ZnO and SiO 2 thin films. It is shown that mass sensitivity of the devices with ZnO layer are larger than that of with SiO 2 guiding layers. A system comprising dual delay line, based on ZnO/90° rotated ST-cut quartz crystal devices, was set up for conducting the immunosensing experiments. In these experiments adsorption of rat immunoglobulin G onto the active area of the sensor was monitored. Upon exposure to solutions containing IgG, the operational frequency of the system changed due to the interaction of IgG and a gold surface on the active area of the sensor. Mass sensitivities were measured and frequency responses to various IgG concentrations are presented.
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