专利详情

专利名称	Surface ionization detector
申请号	US200913133652	专利类型	US
公开（公告）号	US8890534(B2)	公开（授权）日	2014.11.18
申请（专利权）人	中国科学院大连化学物理研究所	发明（设计）人	Guan Yafeng;Li Weiwei;Zhu Daoqian;Wang Jianwei
主分类号	G01N27/62	IPC主分类号	G01N27/62;G01N30/64;H01J49/16
专利有效期	Surface ionization detector 至Surface ionization detector	法律状态
说明书摘要	The present invention refers to a surface ionization detector comprises an emitter, a heating rod, a collecting electrode, a reducing liner and a housing. The emitter is made of molybdenum, platinum or alloy, and in the form of cylinder or a wire spiral. The heating rod heats and supports the metal emitter. When the heating rod is heated to 300-500° C., organic amine compounds collide with the surface of the emitter, generating positive ions through surface thermal ionization and thus are detected. The lowest detecting limit value of tertiary amine by the detector in the present invention can achieve to 10?14 g/s. The response to other hydrocarbons, ketones, etc., is 5-6 orders of magnitude lower than that of organic amines. The detector can selectively detect amines, hydrazines and their derivatives, and so on. The detector can be used as a detector for a gas chromatography system adopting capillary column or packed column, or alternatively be used alone as a sensor.