Highly selective detection of methanol over ethanol by a handheld gas sensor.,Nature Communications

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Highly selective detection of methanol over ethanol by a handheld gas sensor.
Nature Communications ( IF 14.7 ) Pub Date : 2019-09-16 , DOI: 10.1038/s41467-019-12223-4
J van den Broek ₁ , S Abegg ₁ , S E Pratsinis ₁ , A T Güntner _{1,

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Affiliation

Methanol poisoning causes blindness, organ failure or even death when recognized too late. Currently, there is no methanol detector for quick diagnosis by breath analysis or for screening of laced beverages. Typically, chemical sensors cannot distinguish methanol from the much higher ethanol background. Here, we present an inexpensive and handheld sensor for highly selective methanol detection. It consists of a separation column (Tenax) separating methanol from interferants like ethanol, acetone or hydrogen, as in gas chromatography, and a chemoresistive gas sensor (Pd-doped SnO2 nanoparticles) to quantify the methanol concentration. This way, methanol is measured within 2 min from 1 to 1000 ppm without interference of much higher ethanol levels (up to 62,000 ppm). As a proof-of-concept, we reliably measure methanol concentrations in spiked breath samples and liquor. This could enable the realization of highly selective sensors in emerging applications such as breath analysis or air quality monitoring.

中文翻译：

通过手持式气体传感器对甲醇和乙醇进行高选择性检测。

如果发现得太晚，甲醇中毒会导致失明、器官衰竭甚至死亡。目前，还没有可通过呼吸分析进行快速诊断或筛查掺入饮料的甲醇检测器。通常，化学传感器无法区分甲醇和高得多的乙醇背景。在这里，我们提出了一种廉价的手持式传感器，用于高选择性甲醇检测。它由一个分离柱 (Tenax) 和一个化学电阻气体传感器（掺钯 SnO2 纳米颗粒）组成，前者用于将甲醇与乙醇、丙酮或氢气等干扰物分离，如气相色谱法，后者用于量化甲醇浓度。这样，甲醇可在 2 分钟内从 1 ppm 测量到 1000 ppm，而不会受到更高乙醇浓度（高达 62,000 ppm）的干扰。作为概念验证，我们可靠地测量了加标呼吸样品和液体中的甲醇浓度。这可以在呼吸分析或空气质量监测等新兴应用中实现高选择性传感器。

更新日期：2019-09-16

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