Preparation of macroporous BaCO3 films for NOx detection by bulk acoustic wave resonator

抄録

Macroporous BaCO₃ films were prepared by a modified sol-gel technique employing polymethylmethacrylate (PMMA) microsphere film as template and Ba(CH₃COO)₂ aqueous solution as the barium source. The films (ca. 1-2 micron thick) exhibited ordered 3-D BaCO₃ frameworks with macropores derived from PMMA microspheres, after calcination of BaCO₃ precursor/PMMA composite films at 400C for 2 h. The ordered macropores were destroyed after calcination at higher temperatures, however, the high porosity was retained in the films. The NO₂ sensing properties of bulk acoustic wave resonator sensitized by macroporous BaCO₃ films are reported.