摘要
为了实现离子源和高场非对称波形离子迁移谱的其它部分的集成,本文基于PCB工艺设计了一种新型的针-环离子源结构。该结构主要由针电极、环电极、进气底座以及针固定底座组成,针电极采用针尖曲率半径为28μm的不锈钢针作为放电阴极,直径为3mm、高度为16mm的铜环作为放电阳极。放电特性实验结果表明:针-环离子源在放电电压-2kV和-2.8kV时,分别进入了电晕放电和辉光放电,能够在大气压环境下实现稳定放电。在载气流速为1.5L/min、方波射频电压幅值为300V的条件下,两者FAIMS谱图中补偿电压基本相同,且采用针-环离子源和紫外灯离子源所得的FAIMS谱图的电流峰值分别为64pA和45pA,由此表明集成式针-环离子源FAIMS系统能够稳定工作,且相比紫外灯离子源集成性更好,电流信号更强。
A needle-ring ion source structure based on printed circuit board technology was designed to integrate an ion source with a High-field Asymmetric Ion Mobility Spectrometry (FAIMS) structure,which was composed of a needle electrode,loop electrode,air inflow pedestal,and fixed needle pedestal. A stainless steel needle tip with a diameter of 28 μm was used as the cathode,and a copper loop with a diameter of 3 mm and length of16 mm was used as the anode. A discharge property experiment shows that corona and glow discharges are realized through discharge voltages of -2 kV and -2.8 kV,respectively,proving that the stable discharge state could be obtained in ambient air. Comparing the FAIMS system using a UV-lamp ion source with the FAIMS system using a needle-ring ion source,the compensation voltages in the FAIMS spectrum are nearly the same under the conditions of a carrier gas flow rate of1.5 L/min and a high-field rectangular radio peak-to-peak voltage of 300 V. However,the electric currents are 64 pA and 45 pA for the needle-ring and UV-lamp ion sources,respectively. Experimental results thus reveal that the integrated FAIMS using the needle-ring ion source can work stably and that it has a better integration property and stronger signal when compared to a UV-lamp ion source.
作者
李华
云红梅
杜晓霞
曾若生
蒋永荣
陈真诚
LI Hua;YUN Hong-mei;DU Xiao-xia;ZENG Ruo-sheng;JIANG Yong-rong;CHENG Zhen-cheng(School of Life and Environmental Sciences,GuiLin University of Electronic Technology,Guilin 541004,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2019年第6期1255-1262,共8页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.61864001,No.81873913,No.61627807)
广西自然科学基金资助项目(No.2017GXNSFAA198256,No.2017GXNSFGA198005)
广西自动检测技术与仪器重点实验室主任基金资助项目(No.YQ18113)
关键词
针-环离子源
高场非对称波形离子迁移谱
集成
紫外灯离子源
needle-ring ion source
high-field asymmetric waveform ion mobility spectrometry
integration
UV-lamp ion source
