Sensitivity of Ba2WO5 to NOx gas at Elevated Temperature

Abstract

NOx sensing properties of were investigated by varying the sintering temperature in an effort to study the effects of the neck-width on gas sensitivity. sintered at , which exhibits neck-controlled conduction provides highest sensitivity of 47 and 29 at to NO and , respectively. The samples sintered beyond show sintering temperature-independent gas sensitivity. This may be because the grain boundary control is dominant at lower sintering temperatures and open neck control is dominant at higher sintering temperatures than . The NOx sensing mechanism of was briefly discussed.