Metal loaded zeolite films with bi-modal porosity for selective detection of carbon monoxide

• Preparation of metal containing (Pt, Pd) zeolite Beta nanocrystals.
• Assembly of metal containing zeolite crystals in thin films.
• Optical properties of metal containing zeolite films.
• Detection of carbon monoxide, methanol and a mixture of both with zeolite films.

The assembly of metal containing (Pt and Pd) zeolite Beta nanocrystals in thin films retaining a bi-modal porosity (micropores of 0.73 nm and mesopores of 2.3–2.6 nm) is presented. The high porosity of metal loaded films was examined by adsorption of probe molecules (water and toluene). Besides, the optical properties of the films including surface roughness (10 nm), thickness (200–500 nm), and mechanical stability (Young’s modulus of 0.7–1 GPa) are determined. The zeolite films are further used for detection of carbon monoxide as a single analyte and in a mixture with methanol at different temperatures; it is found that 70% of the Pt and Pd surfaces remain accessible for the CO, but higher partial pressure of the analytes is needed to reach the saturation level.

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