Palladium complexes based nanogravimetric sensors for carbon monoxide detection

Two palladium complexes, the [Pd( 2-ol)(8-(di-tert-butylphosphinooxy)quinoline)] and [Pd( 2-ol)(8-(di-tert-butylphosphinooxy)-2-methylquinoline)], have been used as sensing materials to functionalized quartz crystal microbalances (QCM). The developed sensors have been tested to determine carbonmonoxide in air. The reversible binding of CO observed in CH2Cl2solution for both complexes is retainedin the solid state. The functionalized QCMs showed good reproducibility and sensitivity toward CO detec-tion. While CO detection was not influenced by the presence of molecular hydrogen and methane, thehumidity reduced the sensors sensitivity, although the functionalized QCMs were still able to discriminateCO.