Fast Switching of the Polarity of Dual Mode Ion Mobility Spectrometer

Першенков, В.С.; Belyakov, V.V.; Shaltaeva, Y R; Malkin, E.; Головин, А. В.; Иванов, И. А.; Vasilyev, V.; Matusko, M.; Gromov, E.

doi:10.1109/miel.2019.8889591

Cited by 4 publications

(9 citation statements)

References 11 publications

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“…Two different approaches exist for the detection of both ion polarities. On the one hand, single drift-tube IMS can switch polarity, so that positive and negative ions can be analyzed successively . On the other hand, IMS with two drift tubes, so-called dual drift tube IMS, can be used to detect both ion polarities simultaneously .…”

mentioning

confidence: 99%

“…On the one hand, single drift-tube IMS can switch polarity, so that positive and negative ions can be analyzed successively. 7 On the other hand, IMS with two drift tubes, socalled dual drift tube IMS, can be used to detect both ion polarities simultaneously. 8 However, both principles offer different advantages and disadvantages.…”

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confidence: 99%

“…Figure10. GC-IMS heat map of 1 μL sample with 2.5 μg/mL acetone (1), 2-butanone (2), 2-pentanone (3), 2-hexanone (4), 2-heptanone (5) as well as 17.5 μg/mL 1,1,2-trichloroethane (6) and 17 μg/mL 1,2,3-trichloropropane(7) dissolved in methanol (8) on a 30 m Rxi-1 ms column with 320 μm ID and 4 μm d f . Five mL/min N 2 as carrier gas and a temperature programmed run, starting at 40 °C (2.2 min), ramped to 180 °C at 15 K/min and held for 3 min at 180 °C.…”

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confidence: 99%

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Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

et al. 2020

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Ion mobility spectrometers (IMS) with field switching ion shutters are an excellent choice for trace gas detection, being extremely sensitive while having fast response times. However, as different target molecules may form positive, negative, or even ions of both polarities, it is beneficial to simultaneously detect both ion polarities. Here, we present a dual drift tube IMS with a new dual field switching ion shutter for gating both ion polarities and an X-ray ionization source in orthogonal configuration. The dual field switching ion shutter allows significantly improved ion gating and ion accumulation due to improved shielding of the ionization region from the drift field. Equipped with two 75 mm long high-performance drift tubes, the dual IMS reaches high resolving power of R = 90 with detection limits in the lower pptv range for different ketones, chlorinated hydrocarbons and methyl salicylate that forms ions in both polarities.

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Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

et al. 2020

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“…To achieve fast switching of polarity, there are four major considerations for the design of the instrument. The first is to establish uniform electric filed in the drift tube after the change of voltage, which requires minimal capacitance between the electrodes used to define such electric field [24][25][26]. Another benefit for smaller capacitance is the reduction of power consumption, allowing the use of smaller power supply module for high fast switching instrument.…”

Section: Introductionmentioning

confidence: 99%

“…Another benefit for smaller capacitance is the reduction of power consumption, allowing the use of smaller power supply module for high fast switching instrument. The second is concerning the aperture grid in front of the faraday plate, which plays a key role for the elimination of mirror current effect on the ion detector [24,26]. The potential difference of aperture grid and faraday plate is defined by circuit in between, comprising a resistor and a capacitor connecting in parallel.…”

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Ultra-Fast Polarity Switching, Non-Radioactive Drift Tube for the Miniaturization of Drift-Time Ion Mobility Spectrometer

et al. 2022

Sensors

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Drift-time ion mobility spectrometer (DT-IMS) is a promising technology for gas detection and analysis in the form of miniaturized instrument. Analytes may exist in the form of positively or negatively charged ions according to their chemical composition and ionization condition, and therefore require both polarity of electric field for the detection. In this work the polarity switching of a drift-time ion mobility spectrometer based on a direct current (DC) corona discharge ionization source was investigated, with novel solutions for both the control of ion shutter and the stabilization of aperture grid. The drift field is established by employing a switchable high voltage power supply and a serial of voltage regulator diode, with optocouplers to drive the ion shutter when the polarity is switched. The potential of aperture grid is stabilized during the polarity switching by the use of four diodes to avoid unnecessary charging cycle of the aperture grid capacitor. Based on the proposed techniques, the developed DT-IMS with 50 mm drift path is able to switch its polarity in 10 ms and acquire mobility spectrum after 10 ms of stabilization. Coupled with a thermal desorption sampler, limit of detection (LoD) of 0.1 ng was achieved for ketamine and TNT. Extra benefits include single calibration substance for both polarities and largely simplified pneumatic design, together with the reduction of second drift tube and its accessories. This work paved the way towards further miniaturization of DT-IMS without compromise of performance.

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Miniaturized Drift Tube Ion Mobility Spectrometer with Ultra-Fast Polarity Switching

et al. 2022

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Ion mobility spectrometers (IMS) are well suited for detecting trace gases down to levels at ppb v and even ppt v within 1 s of analysis time when using chemical ionization. The measuring principle is based on the separation and detection of the ionized constituents of a sample. Depending on the sample composition, certain ionization sources create both positive and negative analyte ions, but the simultaneous detection of both ion polarities usually requires two drift tubes. Contained within this effort, we present an alternative approach for detecting both ion polarities using one single drift tube that can switch the polarity of the drift tube within 12 ms. This technique allows for generating one positive and one negative ion mobility spectrum, each with a drift time range of 13 ms (minimum reduced ion mobility of K 0 = 0.72 cm 2 V −1 s −1 ), within a total experiment time of 50 ms. Additionally, ions are continuously generated in the ionization region during both the polarity switching and the analysis of one of the polarities, which allows for an effective ionization/reaction time of 25 ms. Comparable to the performance of similar instrument designs we reported previously, the presented device has a high resolving power of R P = 70 with a drift length of 51 mm. The limits of detection are for the monomers between 70 and 370 ppt v and for the dimers between 450 and 800 ppt v for 1 s of averaging for various ketones, methyl salicylate, and chlorinated hydrocarbons. Although this work focuses on applying ultra-fast polarity switching to an existing IMS, the techniques shown here may be applied to other IMS implementations for different applications.

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Fast Switching of the Polarity of Dual Mode Ion Mobility Spectrometer

Cited by 4 publications

References 11 publications

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

Ultra-Fast Polarity Switching, Non-Radioactive Drift Tube for the Miniaturization of Drift-Time Ion Mobility Spectrometer

Miniaturized Drift Tube Ion Mobility Spectrometer with Ultra-Fast Polarity Switching

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