37Advantages of Nanomaterials
lms. A “conventional” arrangement is shown in Figure 5.5a, where cur-
rent passes though the nanoparticle lm and the mean resistance change is
measured as the layer is exposed to the probing gas. Figure 5.5b illustrates
a recently suggested new type of arrangement for nanostructured sensing
lms [50] for the same purpose. In this case, current is driven through a thin
conducting layer, such as gold in the present case, covered by sensor-type
nanoparticles. Resistivity uctuations of the conducting layer are measured as
the device is exposed to the test gas. Sensitivity and other parameters are to be
studied carefully in this case and this approach is expected to provide better
information on nano ...