o expand environmental application of semiconducting gas sensor, we designed a new chemically assembly strategy to decorate noble metal nanocrystals onto the surface of metal oxide nanowires, and get satisfactory gas sensors for monitoring H2S, H2, C2H5OH, and so on. To enhance gas sensitivity and selectivity of QCM sensor, we firstly employed functionalized SBA-15 as sensing materials of QCM to improve gas selectivity and sensitivity due to molecule recognition, hydrophobicity and big specific