Characterization of volatile organic compounds (VOCs) in their liquid-phase by terahertz time-domain spectroscopy

Biomed Opt Express. 2019 Dec 2;11(1):1-7. doi: 10.1364/BOE.11.000001. eCollection 2020 Jan 1.

Abstract

In this work the terahertz spectra of benzene, toluene, p-xylene and styrene-four volatile organic compounds (VOCs) of interest in environmental pollution studies-have been measured in their liquid phase at room temperature using terahertz time-domain spectroscopy (THz-TDS). Their frequency-dependent refractive index and absorption coefficient have been extracted and analyzed in the spectral range from 0.2 to 2.5 THz. The optical properties of bi-component VOCs mixtures have also been investigated and described in terms of a linear combination of pure VOCs optical components.