| 초록 |
In this study, the role of microporous structure of activated carbon fibers (ACF) on dimethyl methylphosphonate (DMMP) gas detection properties was investigated. The polyacrylonitrile (PAN) based stabilized fibers were thermally treated at 800 ℃ and then pore structure for gas adsorption were given by chemical activation process. The PAN based ACF electrode, which is an N-type semiconductor, receives electrons from a reducing gas such as DMMP, and then the density of holes and electrical resistance of its electrode are finally decreased. The sensitivity of DMMP gas detection increased from 1.6% to 5.4% as the specific surface area and micropore volume increased. It is attributed that DMMP gas causes the electron hopping by filling the micropores and then facilitates the electron movements in ACF. |
