First-principles insights into the C₆N₇ monolayer as a highly efficient sensor and scavenger for the detection of selective volatile organic compounds

RSC Advances, Journal Year: 2023, Volume and Issue: 13(41), P. 28703 - 28712

Published: Jan. 1, 2023

The design of new gas sensors and scavengers volatile organic compounds (VOCs) is desirable for VOC enriching, separation utilization.

Language: Английский

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Terahertz Waveguides by Coupling Plasmon Polaritons of Cylindrical Metal Wires and a Graphene‐Embedded Slot Waveguide

Advanced Photonics Research, Journal Year: 2023, Volume and Issue: 4(3)

Published: Feb. 1, 2023

Transmitting and processing terahertz (THz) signals in a chip‐scale form are tremendously important due to extensive demands for these various applications ranging from sensing, imaging, communication, spectroscopy. However, developing compact low‐loss THz devices is still challenging task. Herein, novel waveguide structure consisting of graphene‐embedded slot sandwiched between two cylindrical metal wires operating the range f = 1–5 proposed. By appropriately modulating mode hybridizing graphene wires, resultant obtains long propagation distance 192 μm, while maintaining an ultrasmall area 1.7 × 10 −4 , thereby achieving unprecedented high figure merit (FoM) 12 985. Compared with other reported structures, proposed outperforms structures term FoM, crosstalk, fabrication difficulty. Furthermore, degree integration evaluated by analyzing crosstalk adjacent waveguides. With edge‐to‐edge spacing 2.7 power transfer waveguides can be ignored approximately frequency independent. It believed that design paves insightful approach into designing wider variety promising photonic integrated circuits.

Language: Английский

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Miniaturizing gas sensors combining mid-infrared interband cascade light emitting diodes with substrate-integrated hollow waveguides

AIP Advances, Journal Year: 2024, Volume and Issue: 14(8)

Published: Aug. 1, 2024

In this study, we report a compact and versatile gas sensor system combining mid-infrared interband cascade light emitting diodes (MIR-ICLEDs) with substrate-integrated hollow waveguides (iHWGs) toward miniaturized sensors. Two readily exchangeable MIR-ICLEDs center emission wavelengths of 3.4 µm (2941 cm−1) 5.7 (1754 cm−1), respectively, were integrated into modular using the iHWG simultaneously as cell. The performance for quantitative analysis was evaluated based on calibration functions established four analytes (i.e., methane, isobutane, acetone, acetaldehyde) within respective spectral regions. utility such non-dispersive infrared tested various scenarios, including application filters, individual ICLEDs, in mixtures. Furthermore, demonstrated that modularity design facilitates flexible adaptation to target species available sample volumes, differentiating components

Language: Английский

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VOC-Net: A Deep Learning Model for the Automated Classification of Rotational THz Spectra of Volatile Organic Compounds

Applied Sciences, Journal Year: 2022, Volume and Issue: 12(17), P. 8447 - 8447

Published: Aug. 24, 2022

Conventional black box machine learning (ML) algorithms for gas-phase species identification from THz frequency region absorption spectra have been reported in the literature. While robust classification performance of such ML models is promising, nature these tools limits their interpretability and acceptance application. Here, a one-dimensional convolutional neural network (CNN), VOC-Net, developed demonstrated volatile organic compounds (VOCs) range, specifically 220 to 330 GHz where prior experimental data available. VOC-Net trained validated against simulated spectra, also tested spectra. The examined by consideration confusion matrices receiver-operator-characteristic (ROC) curves. model shown be 99+% accurate 97% noisy model’s internal logic using Gradient-weighted Class Activation Mapping (Grad-CAM) method, which provides visual interpretable explanation decision making process with respect important distinguishing spectral features.

Language: Английский

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Spectroscopic evidence of the radioresistance of Chroococcidiopsis biosignatures: A combined Raman, FT-IR and THz-TDs spectroscopy study

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Journal Year: 2022, Volume and Issue: 288, P. 122148 - 122148

Published: Nov. 24, 2022

In the last decades, Mars has been widely studied with on-site missions and observations, showing a planet that could have hosted life in past. For this reason, recent future space on red will search for traces of past and, possibly, present life. As basis these missions, Space Agencies, such as European Agency, conducted many experiments living organisms, studying their behavior extraterrestrial conditions, learning to recognize biosignatures techniques remotely controllable Raman spectroscopy. Among radioresistant cyanobacterium Chroococcidiopsis was irradiated during STARLIFE campaign strong radiative insults. article we investigated using spectroscopy extended characterization its response stress mid- Infrared Terahertz spectral region Fourier Transform InfraRed (FT-IR) Time Domain (THz- TDs), which demonstrates compatibility suitability missions.

Language: Английский

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