Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

Barik, Puspendu; Pradhan, Manik

doi:10.1039/d1an02070f

Cited by 36 publications

(16 citation statements)

References 352 publications

(392 reference statements)

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“…Selectivity is a figure of merit for gas sensors that discriminate the target if there is interference molecules. 40 Sensitivity (Sens) is defined as the S value divided by the gas concentration and is used to determine target selectivity. 1 The S and Sens values for the UVTA-120 sample for various toxic gases, including CO, H 2 S and NO 2 , are shown as floating columns in Fig.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Solution-Processed ZnSnO Ozone Gas Sensors Using UV-Assisted Thermal Annealing

Lin¹,

Jiang²,

Huang³

et al. 2022

J. Electrochem. Soc.

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Ultraviolet-assisted thermal annealing (UVTA) has been widely used to fabricate solution-processed amorphous oxide semiconductor (AOS)-based transistors and photodetectors. However, this method has not been used for AOS-based gas sensors, even though AOS is a good gas sensing material. This study determines the effect of UVTA on the electrical properties of In-free amorphous ZnSnO (ZTO) thin films and their ozone (O3) gas sensing characteristics. UV light from a mercury lamp has sufficient energy to decompose the organic- and hydrogen-based impurities completely, which promotes the formation of metal oxide networks, so the quality of ZTO films is greatly increased by increasing treatment time. A relatively high gas response of 1.42 with a fast response/recovery time (124/78 s) is achieved. This strategy allows the fabrication of ZTO gas sensors at low temperature (150°C) and is applicable to flexible electronics.

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Section: Resultsmentioning

confidence: 99%

Low-Temperature Solution-Processed ZnSnO Ozone Gas Sensors Using UV-Assisted Thermal Annealing

Lin¹,

Jiang²,

Huang³

et al. 2022

J. Electrochem. Soc.

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“…However, in some cases (e.g. real-time gas monitoring 35 ), short measurement times and high refresh rates are preferred over the above features. A spectrum resulting from a single interferogram of 50 ms is displayed in Fig.…”

Section: Multiplexed Spectral Measurementmentioning

confidence: 99%

Dual-comb optomechanical spectroscopy

Ren

Jin

Yan

et al. 2023

Preprint

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Optical cavities are essential for enhancing the sensitivity of molecular absorption spectroscopy, which finds widespread high-sensitivity gas sensing applications. However, the use of high-finesse cavities confines the wavelength range of operation and prevents broader applications. Here, we take a different approach to ultrasensitive molecular spectroscopy, namely dual-comb optomechanical spectroscopy (DCOS), by integrating the high-resolution multiplexing capabilities of dual-comb spectroscopy with cavity optomechanics through photoacoustic coupling. By exciting the molecules photoacoustically with dual-frequency combs and sensing the molecular-vibration-induced ultrasound waves with a cavity-coupled mechanical resonator, we obtain high-resolution broadband (>2 THz) overtone spectra for acetylene gas. The detection limit down to 15 parts per trillion is achieved without the restriction on the comb wavelengths. Our innovative approach not only enriches the practical applications of the emerging cavity optomechanics technology but also offers intriguing possibilities for multi-species trace gas detection.

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“…Trace gas detection has extensive applications such as breath analysis, 1 industrial control, 2,3 environmental science, 4,5 and atmospheric and astronomic chemistry. 6,7 Usually, the detection limits of the gas contents in a given sample are required to reach the level of ppmv (μmol/mol) or even ppbv (10 −3 μmol/mol).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Trace gas detection has extensive applications such as breath analysis, industrial control, , environmental science, , and atmospheric and astronomic chemistry. , Usually, the detection limits of the gas contents in a given sample are required to reach the level of ppmv (μmol/mol) or even ppbv (10 –3 μmol/mol). Trace gas detection based on laser spectroscopy can achieve high sensitivity, fast response, real-time, and in situ monitoring without consuming gas samples .…”

Section: Introductionmentioning

confidence: 99%

Multiple Gas Detection by Cavity-Enhanced Raman Spectroscopy with Sub-ppm Sensitivity

Yang

Tan

Qu³

et al. 2023

Anal. Chem.

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Accurate and sensitive detection of multicomponent trace gases below the parts-per-million (ppm) level is needed in a variety of medical, industrial, and environmental applications. Raman spectroscopy can identify multiple molecules in the sample simultaneously and has excellent potential for fast diagnosis of various samples, but applications are often limited by its sensitivity. In this contribution, we report the development of a cavity-enhanced Raman spectroscopy instrument using a narrow-line width 532 nm laser locked with a high-finesse cavity through a Pound-Drever-Hall locking servo, which allows continuous measurement in a broad spectral range. An intracavity laser power of up to 1 kW was achieved with an incident laser power of about 240 mW, resulting in a significant enhancement of the Raman signal in the range of 200–5000 cm–1 and a sub-ppm sensitivity for various molecules. The technique is applied in the detection of different samples, including ambient air, natural gas, and reference gas of sulfur hexafluoride, demonstrating its capability for the quantitative measurement of various trace components.

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Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

Abstract: Selectivity is one of the most crucial figures of merit in trace gas sensing, and thus a comprehensive assessment is necessary to have a clear picture of sensitivity, selectivity, and...

Cited by 36 publications

References 352 publications

Low-Temperature Solution-Processed ZnSnO Ozone Gas Sensors Using UV-Assisted Thermal Annealing

Low-Temperature Solution-Processed ZnSnO Ozone Gas Sensors Using UV-Assisted Thermal Annealing

Dual-comb optomechanical spectroscopy

Multiple Gas Detection by Cavity-Enhanced Raman Spectroscopy with Sub-ppm Sensitivity

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