Abstract
ZSM-5 zeolite films were grown on Si substrates by a two-step hydrothermal synthesis consisting of in situ seeding and secondary crystal growth. The films were 8-13 mu m thick and partly oriented with the c-axis perpendicular to the substrate surface. After ion exchange with sodium ions, one film was applied as solid electrolyte in a potentiometric hydrocarbon gas sensor. A fast and reversible voltage response of the sensor to varying propane concentrations (100 ppm - 10%) was observed in O(2)/CO(2)/N(2) gas mixtures at 723 K. (C) 2007 Elsevier Inc. All rights reserved.