Capabilities and limitations of ion mobility spectrometry for field screening applications

Hill, Herbert H.; Simpson, Greg D.

doi:10.1002/(sici)1520-6521(1997)1:3<119::aid-fact2>3.0.co;2-s

Cited by 105 publications

(29 citation statements)

References 14 publications

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“…Despite its sensitivity and robustness, IMS has limited chemical specificity, partly resulting from the low temporal resolution inherent in the separation of the ion mobility peaks, which can result in false positive results [11]. The use of a radiation-based ionization source, which is subject to safety and bureaucratic limitations, is another disadvantage [12]. Proton-transfer-reaction mass spectrometry (PTR-MS) has also been employed to detect trace quantities of TAs.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive detection of explosives and chemical warfare agents by low-pressure photoionization mass spectrometry

Sun

Liang

et al. 2016

Talanta

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive detection of explosives and chemical warfare agents by low-pressure photoionization mass spectrometry

Sun

Liang

et al. 2016

Talanta

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“…[1][2][3] Use of explosives sniffing dogs, though attractive, is not very practical. 4,5 Presently used detection techniques are either bulky and expensive, such as ion mobility spectrometry devices, 6 or suffer from low sensitivity. Despite their high selectivity, techniques based on Raman and laserinduced breakdown spectroscopies have weak signals making them better suited to bulk material detection than to trace vapor detection.…”

Section: Introductionmentioning

confidence: 99%

Micro-differential thermal analysis detection of adsorbed explosive molecules using microfabricated bridges

Senesac

Greve

et al. 2009

Review of Scientific Instruments

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Although micromechanical sensors enable chemical vapor sensing with unprecedented sensitivity using variations in mass and stress, obtaining chemical selectivity using the micromechanical response still remains as a crucial challenge. Chemoselectivity in vapor detection using immobilized selective layers that rely on weak chemical interactions provides only partial selectivity. Here we show that the very low thermal mass of micromechanical sensors can be used to produce unique responses that can be used for achieving chemical selectivity without losing sensitivity or reversibility. We demonstrate that this method is capable of differentiating explosive vapors from nonexplosives and is additionally capable of differentiating individual explosive vapors such as trinitrotoluene, pentaerythritol tetranitrate, and cyclotrimethylenetrinitromine. This method, based on a microfabricated bridge with a programmable heating rate, produces unique and reproducible thermal response patterns within 50 ms that are characteristic to classes of adsorbed explosive molecules. We demonstrate that this micro-differential thermal analysis technique can selectively detect explosives, providing a method for fast direct detection with a limit of detection of 600×10−12 g.

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“…[1][2][3] Although it is the most widely used method and is highly effective, trace explosive detection based on canines is neither cost effective nor suitable for mass deployment. 4,5 Currently available trace detection technologies, such as ion mobility spectrometry 6 are bulky and expensive. Optical spectroscopic techniques such as Raman and laser-induced breakdown spectroscopies are highly selective but suffer from poor sensitivity.…”

mentioning

confidence: 99%

Detection of adsorbed explosive molecules using thermal response of suspended microfabricated bridges

Greve

Hales

et al. 2008

Applied Physics Letters

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Here we present a thermophysical technique that is capable of differentiating vapor phase adsorbed explosives from nonexplosives and is additionally capable of differentiating individual species of common explosive vapors. This technique utilizes pairs of suspended microfabricated silicon bridges that can be heated in a controlled fashion. The differential thermal response of the bridges with and without adsorbed explosive vapor shows unique and reproducible characteristics depending on the nature of the adsorbed explosives. The tunable heating rate method described here is capable of providing unique signals for subnanogram quantities of adsorbed explosives within 50 ms.

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Capabilities and limitations of ion mobility spectrometry for field screening applications

Cited by 105 publications

References 14 publications

Ultrasensitive detection of explosives and chemical warfare agents by low-pressure photoionization mass spectrometry

Ultrasensitive detection of explosives and chemical warfare agents by low-pressure photoionization mass spectrometry

Micro-differential thermal analysis detection of adsorbed explosive molecules using microfabricated bridges

Detection of adsorbed explosive molecules using thermal response of suspended microfabricated bridges

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