单电极介质阻挡放电离子源研究

介质阻挡放电离子源是一种常压敞开式离子源,由于免试剂、适用范围广、易于小型化等特点而备受关注。该类离子源多采用表面双电极或针-环电极设计方式。表面双电极的接地电极会减弱氦气在强电场中电离形成的流注崩头能量,缩短等离子束喷射距离。针-环电极的电场主要集中在针电极尖端,流注崩头能量小,等离子束喷射距离比表面双电极还短。本研究对放电影响因素进行分析,通过改变电极形状和增加绝缘介质部件进行电场调整,使强电场区域集中于电极一侧,解决了单电极回流放电问题,从而获得稳定、高效的等离子束,其最大长度可达8 cm以上。基于电场调整技术,研制出单电极介质阻挡放电离子源,它主要由惰性载气、高压电极、绝缘介质管、气控...

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Bibliographic Details
Published in分析化学 Vol. 44; no. 2; pp. 252 - 257
Main Author 宁录胜 徐明 郭成安 赵鹏 闻路红 张新荣
Format Journal Article
LanguageChinese
Published 宁波大学高等技术研究院,宁波,315211%清华大学化学系,北京,100084 2016
Subjects
介质阻挡放电
单电极
离子源
Single electrode
介质阻挡放电
Dielectric barrier discharge
Ion source
单电极
离子源
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ISSN0253-3820
DOI10.11895/j.issn.0253-3820.150784

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Summary:介质阻挡放电离子源是一种常压敞开式离子源,由于免试剂、适用范围广、易于小型化等特点而备受关注。该类离子源多采用表面双电极或针-环电极设计方式。表面双电极的接地电极会减弱氦气在强电场中电离形成的流注崩头能量,缩短等离子束喷射距离。针-环电极的电场主要集中在针电极尖端,流注崩头能量小,等离子束喷射距离比表面双电极还短。本研究对放电影响因素进行分析,通过改变电极形状和增加绝缘介质部件进行电场调整,使强电场区域集中于电极一侧,解决了单电极回流放电问题,从而获得稳定、高效的等离子束,其最大长度可达8 cm以上。基于电场调整技术,研制出单电极介质阻挡放电离子源,它主要由惰性载气、高压电极、绝缘介质管、气控以及温控部分组成。使用新型离子源对咖啡因液态样品和扑热息痛固体药片进行了质谱分析,前者的定量曲线R^2值为99.66%,100μg/L的信噪比为23;后者的主要成分对乙酰氨基酚可在质谱中快速检出,响应强度为1.26×10^6。上述结果表明,新型离子源可以实现样品的定量和快速原位分析。
Bibliography:22-1125/O6
Single electrode; Dielectric barrier discharge; Ion source
Dielectric barrier discharge ion source is an ambient ion source. Coupled with its advantages of solvent-free method, extensive application scope and easy miniaturization, it has attracted widespread attention. The conventional dielectric barrier discharge ion source uses surface double electrode or needle-ring electrode designs. The grounded electrode of the former can weaken ionization head energy formed in strong electric field of helium ionization, and shorten the distance of plasma beam. The electric field of the latter mainly concentrates on the peak of the needle electrode, which can weaken the energy of ionization head and make the length of the plasma beam shorter than the surface double electrode. In this work, the influencing factors of discharge were analyzed, and the electric field was adjusted by changing the shape of the electrode and increasing insulation medium components, thus forcing the strong electric field to focus on on
ISSN:0253-3820
DOI:10.11895/j.issn.0253-3820.150784