... Conclusions The sensing materials of WO loaded with wt.% metal oxides were prepared and applied for NH and NO detection, and several composition materials with good responses, both to NH and NO, were ... NO. , and fast response to NH and NO compared with pure WO The materials of WO loaded with wt.% Cr, La, Pr, Sm, Gd, Er, Tm and Yb showed good responses to NH , and hardly responded to NO, and ... responded to NO, and the materials of WO loaded with wt.% Ba, Te, and Pb showed good responses to NO and hardly responded to NH These two kinds of materials can be used as NH and NO selective gas sensors,...