THz Gas Sensing Using Terahertz Time-Domain Spectroscopy with Ceramic Architecture

Komatsu, Keiji; Iwamoto, Toshiyuki; Ito, Hajime; Saitoh, Hidetoshi

doi:10.1021/acsomega.2c01635

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…THz-FDS has proven to be a reliable methodological approach with high resolution in gas detection and quantitative evaluation of VOCs in multicomponent mixtures, which is useful for human breath analysis and environmental/occupational monitoring [41]. Recently, some new systems have also been developed, such as THz-TDS with ceramic architecture, which are used to create unique crystal structures, morphologies and properties [150]. This system allows the selective detection of gas in a mixture of VOCs at ppm concentrations by controlling the architecture of porous glass coated with ceramic films on which the VOC is adsorbed.…”

Section: Volatile Organic Compoundsmentioning

confidence: 99%

Analytical Gas Sensing in the Terahertz Spectral Range

Abina,

Puc,

Jazbinšek

et al. 2023

Micromachines

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Exploiting the terahertz (THz) part of the electromagnetic spectrum is attracting attention in various scientific and applied disciplines worldwide. THz technology has also revealed its potential as an effective tool for gas analysis in astronomy, biomedicine and chemical analysis. Recently, it has also become important in environmental applications for monitoring hazardous and toxic gases in the atmosphere. This paper gives an overview of THz gas detection analytical methods for environmental and biomedical applications, starting with a brief introduction to THz technology and an explanation of the interaction of THz radiation with gaseous species and the atmosphere. The review focuses on several gaseous species and groups of air pollutants that have been or can be analysed by THz spectrometry. The review concludes that different but complementary THz detection methods allow unique detection, identification and quantification of gaseous and particulate air pollutants with high selectivity, specificity and sensitivity. THz detection methods also allow further technological improvements and open new application possibilities.

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Section: Volatile Organic Compoundsmentioning

confidence: 99%

Analytical Gas Sensing in the Terahertz Spectral Range

Abina,

Puc,

Jazbinšek

et al. 2023

Micromachines

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“…In recent years, terahertz time-domain spectroscopy (THz-TDS) has been explored for chemical pesticide detection and analysis [4,5] , in addition to its other applications in medical imaging and detection of biomolecules and toxic gases [6][7][8] . While the sensitivity of THz-TDS can be increased by using metamaterial sensors that enhance the pesticide's chemical fingerprint [9][10][11] , they are expensive to fabricate.…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity pesticide detection on mango skins by terahertz spectroscopy with graphene oxide sensors

Wang,

Yeo,

Zhang

et al. 2023

FNC

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Regular monitoring of pesticides in agricultural farmland is essential to prevent the misuse of toxic pesticide chemicals. As crop samples are typically disintegrated to extract the pesticide residue for chromatographic analysis, non-destructive techniques for pesticide monitoring are ideal for preventing the unwanted destruction of crops. This, however, requires analytical techniques that can detect trace pesticide amounts. Here, we show that terahertz (THz) spectroscopy in attenuated total reflection mode, combined with low-cost graphene oxide (GO) plasmonic sensor, can be used for sensitive, fast, and non-destructive pesticide detection on mango skin. After the application of pesticide solution onto the mango skin, the dried pesticide residue was transferred to the GO sensor by pressing it in contact with the mango skin surface. Due to the adsorption of the pesticide molecules onto the oxygen-rich GO surface, a signal in the THz range was obtained corresponding to the pesticide’s chemical fingerprint. With this technique, pesticide surface concentrations of approximately 1 µg/cm2 on mango skins can be detected.

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Optical terahertz metamaterial switch controlled via high-stability CsPbBr₃ microcrystals

Cheng,

Liang,

et al. 2024

Opt. Express

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Dynamic control of terahertz metamaterials using thin organic perovskite active layers has been extensively researched. However, the preparation of organic perovskite devices requires strict environmental conditions, and the devices are prone to hydrolysis in air, which reduces performance. Herein, we report an optical terahertz metamaterial switch controlled via hybridization with high-stability CsPbBr3 microcrystals prepared through precipitation from a water–dimethylformamide (DMF) mixed-solution. Under light excitation, a modulation factor of 24% was achieved based on the photoelectric and photothermal effects of the CsPbBr3 microcrystals. After exposure to air for four months, the modulation factor remained essentially unchanged, demonstrating the exceptional stability of the system generated. Following the integration of CsPbBr3 microcrystals with the metamaterial, a frequency-shift of its dipole resonance and switching of Fano resonance was achieved, providing a novel approach to dynamic control of terahertz waves.

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THz Gas Sensing Using Terahertz Time-Domain Spectroscopy with Ceramic Architecture

Cited by 3 publications

References 17 publications

Analytical Gas Sensing in the Terahertz Spectral Range

Analytical Gas Sensing in the Terahertz Spectral Range

High-sensitivity pesticide detection on mango skins by terahertz spectroscopy with graphene oxide sensors

Optical terahertz metamaterial switch controlled via high-stability CsPbBr₃ microcrystals

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THz Gas Sensing Using Terahertz Time-Domain Spectroscopy with Ceramic Architecture

Cited by 3 publications

References 17 publications

Analytical Gas Sensing in the Terahertz Spectral Range

Analytical Gas Sensing in the Terahertz Spectral Range

High-sensitivity pesticide detection on mango skins by terahertz spectroscopy with graphene oxide sensors

Optical terahertz metamaterial switch controlled via high-stability CsPbBr3 microcrystals

Contact Info

Product

Resources

About

Optical terahertz metamaterial switch controlled via high-stability CsPbBr₃ microcrystals