[15a-P6-1~13] 6.5 Surface Physics, Vacuum

▲ [15a-P6-2] Study the effect of GO:TiO₂ proportions in GO/ TiO₂ composite for the fabrication of QCM Gas Sensor

〇(M2)Pramudi Savidya Jayawardena¹, Hirulak Dilshan Siriwardena², Atsushi Kubono^1,2, Masaru Shimomura^1,2 (1.GSIST,Shizuoka Univ., 2.GSST,Shizuoka Univ.)

Keywords:Graphene Oxide, Gas sensors, QCM

This research deals with, studies concerning the construction of sensors based on quartz crystal microbalance (QCM) containing graphene oxide / TiO₂ composite sensor layers. GO was prepared using modified Hummers method. TiO₂ was prepared using Ammoniumhexafluorotitanate with liquid phase deposition method.The composite was spin coated on the gold-plated QCM resonator and the sensing performance of functionalized QCM resonators was examined with GO, TiO₂ and GO/TiO₂ composite of different GO ratios. Optimum sensitivity was obtained for 30% GO in the precursor solution whereas individual composites show lower sensitivity. Further, sensing performance of functionalized QCM resonator (GO w/w=30%) was examined by changing EtOH concentration from 417 ppm – 42 ppm. All responses obtained were similar in shape, and the response of QCM resonator decreased proportionally to the gas concentration.