Aqueous Slurry Coating and Fabrication of QCM Sensor by Zeolite/Cobalt-Pphthalocyanine Ship-in-Bottle Powders

Abstract

A new quartz crystal microbalance (QCM) composite material was developed by applying an aqueous dip-coating process to the ship-in-bottle-type zeolite powder which included cobalt-phthalocyanine (CoPc) molecules. A coat layer was not made only with zeolite and CoPc-zeolite (faujasite) powders. But it can be obtained by an aqueous slurry of 75wt% CoPc-zeolite mixed with γ-Al₂O₃, without heat-treatment at high temperature. Over the inner surface of the hydrophilic faujasite, which was suitable for a water system slurry process, the good toluene adsorption characteristic was given with by letting faujasite-type zeolite contain CoPc. We achieved the manufacture of the QCM sensor by all inorganic slurry coating technology and confirmed that it showed detectability of the adsorption gas. In this study, we made use of an aqueous molding technique of the ship-in-bottle-type zeolite and provided new knowledge about the materials development concerning sensor-functionalization using CoPc-zeolite.