Research on filter materials for LP gas sensors

摘要

It is well known that semiconductor gas sensor characteristics may change when exposed to siloxane vapor. In this study, we examined filter materials to improve the siloxane durability of the LP gas sensor. Adsorption isotherms of octamethylcyclotetra-siloxane (D4) at 298 K were measured for each filter materials. As a result, γ-Al_2O_3 showed high performance in adsorption amount. However, the sensor with mixed filter materials of MPR-PEG (Mordenite zeolite modified with polyethylene glycol) and γ-Al_2O_3 was more stable after the D4 durability test than the sensors with the single filter materials. The γ-Al_2O_3 mixed with MOR-PEG maintains capacity for D4.