Sensing Liquid- and Gas-Phase Hydrocarbons via Mid-Infrared Broadband Femtosecond Laser Source Spectroscopy

IF 4.6 Q1 CHEMISTRY, ANALYTICAL ACS Measurement Science Au Pub Date : 2023-10-12 DOI:10.1021/acsmeasuresciau.3c00026

Michael Hlavatsch, Andrea Teuber, Max Eisele and Boris Mizaikoff*,

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Abstract

In this study, we demonstrate the combination of a tunable broadband mid-infrared (MIR) femtosecond laser source separately coupled to a ZnSe crystal horizontal attenuated total reflection (ATR) sensor cell for liquid phase samples and to a substrate-integrated hollow waveguide (iHWG) for gas phase samples. Utilizing this emerging light source technology as an alternative MIR radiation source for Fourier transform infrared (FTIR) spectroscopy opens interesting opportunities for analytical applications. In a first approach, we demonstrate the quantitative analysis of three individual samples, ethanol (liquid), methane (gas), and 2-methyl-1-propene (gas), with limits of detection of 0.3% (ethanol) and 22 ppm_v and 74 ppm_v (methane and isobutylene), respectively, determined at selected emission wavelengths of the MIR laser source (i.e., 890 cm^–1, 1046 and 1305 cm^–1). Hence, the applicability of a broadband MIR femtosecond laser source as a bright alternative light source for quantitative analysis via FTIR spectroscopy in various sensing configurations has been demonstrated.

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通过中红外宽带飞秒激光源光谱传感液相和气相碳氢化合物

在这项研究中，我们展示了将可调谐宽带中红外（MIR）飞秒激光光源分别与用于液相样品的 ZnSe 晶体水平衰减全反射（ATR）传感器单元和用于气相样品的基底集成空心波导（iHWG）相结合的方法。利用这种新兴光源技术作为傅立叶变换红外（FTIR）光谱的替代中红外辐射源，为分析应用带来了有趣的机遇。在第一种方法中，我们展示了对乙醇（液体）、甲烷（气体）和 2-甲基-1-丙烯（气体）这三种样品的定量分析，检测限分别为 0.3%（乙醇）、22 ppmv 和 74 ppmv（甲烷和异丁烯），是在选定的中红外激光源发射波长（即 890 cm-1、1046 和 1305 cm-1）下测定的。因此，宽带近红外飞秒激光源作为一种明亮的替代光源，适用于在各种传感配置中通过傅立叶变换红外光谱进行定量分析。

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来源期刊

ACS Measurement Science Au 化学计量学-

CiteScore

5.20

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0.00%

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期刊介绍： ACS Measurement Science Au is an open access journal that publishes experimental computational or theoretical research in all areas of chemical measurement science. Short letters comprehensive articles reviews and perspectives are welcome on topics that report on any phase of analytical operations including sampling measurement and data analysis. This includes:Chemical Reactions and SelectivityChemometrics and Data ProcessingElectrochemistryElemental and Molecular CharacterizationImagingInstrumentationMass SpectrometryMicroscale and Nanoscale systemsOmics (Genomics Proteomics Metabonomics Metabolomics and Bioinformatics)Sensors and Sensing (Biosensors Chemical Sensors Gas Sensors Intracellular Sensors Single-Molecule Sensors Cell Chips Arrays Microfluidic Devices)SeparationsSpectroscopySurface analysisPapers dealing with established methods need to offer a significantly improved original application of the method.