Figure 5.

(a) Schematic representation of a SAW device with a side view showing the cone shaped cyclodextrin-based monolayer receptors. Furthermore, the device was integrated with a four pin holder which was covered with a special lid having openings for gas inlets and outlets thus, showing the design of measuring cell, whereas (b) shows the chemical reactions for synthesizing self-assembled monolayers as well as sol-gel films that were coated on SAW devices. Adapted with permission from [58], copyright (2000) Elsevier.