Preparation of Zeolite Modified Tin Oxide and Its Applications in Gas Sensor
|Keywords:||介孔;二氧化錫;ZSM-5;氣體感測器;旋轉塗佈;Mesoporous;Tin oxide;ZSM-5;Gas sensor;spin coating||Issue Date:||2007||Abstract:||
SnO2 is a n-type semiconductor and has been a key material in applications as gas sensor. In this study, pure and Pt- incorporated mesostructured SnO2 (designated as MSn and zPt-MSn) were prepared by using cationic surfactant (cetyltrimethyl ammoniumbromide, CTMABr ) as the template and sodium stannous trihydrate (Na2SnO3*3H2O) and platiumchloride (PtCl4) as inorganic precursors. The ordered mesoporous structure of MSn and zPt-MSn materials with large specific surface areas (about 100 m2/g) and narrow pore size distribution were maintained after calcination at 400℃. In post synthesis, microporous silica was coated on MSn and zPt-MSn (designated as ZSn and ZSn-zPt) through hydrothermal treatment. This coating increased the thermal stability of the mesoporous SnO2 materials due to the effective inhibition of SnO2 crystal growth. Therefore the surface areas of ZSn and ZSn-zPt materials after calcination were higher than MSn and zPt-MSn. But the pore size distribution were broader.
At gas sensor fabrication, the materials were applied as films to glass substrates by spin coating, drop coating and pasting, and all the materials were subjects to sensor detection after pasting as films. The sensors we fabricated were sensing H2 and CO. At sensing H2， the sensors besides showed sensitivity and
the effect of concentration of sensing gas H2 on the sensitivity indicates a linear response; at sensing CO, the results were undesirability.
|Appears in Collections:||化學系|
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