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Advanced Gas Sensors for Toxic Organics Detection
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Advanced Gas Sensors for Toxic Organics Detection

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: 25 May 2025 | Viewed by 1548

Special Issue Editor

Dr. Shanfu Sun

E-Mail Website
Guest Editor
School of Aerospace Science and Technology, Xidian University, Xi’an 710126, China
Interests: gas sensor; piezoelectric sensors; photo/electrocatalysis

Special Issue Information

Dear Colleagues,

Toxic volatile/semi-volatile organic compounds (VOCs/SVOCs) such as acetone, toluene, phenol, formaldehyde, n-hexane, ethyl acetate, and ethanol are common types of air pollutants, which are wildly produced in industries such as paint production, metal and chemical coatings, leather production, plywood manufacturing, and tire manufacturing. The emissions and leakage of these toxic VOCs/SVOCs cause potential hazards to human health and the environment. Developing efficient toxic VOC/SVOC detection sensors is critical for environmental monitoring and public security. Gas sensors based on chemiresistive functional materials are promising detection methods. An ideal gas sensor requires high responsivity, good selectivity, fast response/recovery, great stability/repeatability, room-working temperature, and low cost and it must be easy-to-fabricate for practical applications. The Special Issue “Advanced Gas Sensors for Toxic Organics Detection” aims to provide a platform for the scientific community to present their advanced research in gas sensors for toxic organic compound detection. Potential research on toxic VOC/SVOC detection by gas sensors will be considered, including but not limited to acetone, toluene, phenol, formaldehyde, n-hexane, ethyl acetate, and ethanol gas sensors.

Dr. Shanfu Sun
Guest Editor

Manuscript Submission Information

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Keywords

  • VOC/SVOC detection
  • acetone gas sensor
  • toluene gas sensor
  • phenol gas sensor
  • formaldehyde gas sensor
  • n-hexane gas sensor
  • ethyl acetate gas sensor
  • ethanol gas sensor

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Published Papers (2 papers)

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Research

14 pages, 1684 KiB  
Article
Design, Build, and Initial Testing of a Portable Methane Measurement Platform
by Stuart N. Riddick, John C. Riddick, Elijah Kiplimo, Bryan Rainwater, Mercy Mbua, Fancy Cheptonui, Kate Laughery, Ezra Levin and Daniel J. Zimmerle
Sensors 2025, 25(7), 1954; https://doi.org/10.3390/s25071954 - 21 Mar 2025
Viewed by 371
Abstract
The quantification of methane concentrations in air is essential for the quantification of methane emissions, which in turn is necessary to determine absolute emissions and the efficacy of emission mitigation strategies. These are essential if countries are to meet climate goals. Large-scale deployment [...] Read more.
The quantification of methane concentrations in air is essential for the quantification of methane emissions, which in turn is necessary to determine absolute emissions and the efficacy of emission mitigation strategies. These are essential if countries are to meet climate goals. Large-scale deployment of methane analyzers across millions of emission sites is prohibitively expensive, and lower-cost instrumentation has been recently developed as an alternative. Currently, it is unclear how cheaper instrumentation will affect measurement resolution or accuracy. To test this, the Wireless Autonomous Transportable Methane Emission Reporting System (WATCH4ERS) has been developed, comprising four commercially available sensing technologies: metal oxide (MOx,), Non-dispersion Infrared (NDIR), integrated infrared (INIR), and tunable diode laser absorption spectrometer (TDLAS). WATCHERS is the accumulated knowledge of several long-term methane measurement projects at Colorado State University’s Methane Emission Technology Evaluation Center (METEC), and this study describes the integration of these sensors into a single unit and reports initial instrument response to calibration procedures and controlled release experiments. Specifically, this paper aims to describe the development of the WATCH4ERS unit, report initial sensor responses, and describe future research goals. Meanwhile, future work will use data gathered by multiple WATCH4ERS units to 1. better understand the cost–benefit balance of methane sensors, and 2. identify how decreasing instrumentation costs could increase deployment coverage and therefore inform large-scale methane monitoring strategies. Both calibration and response experiments indicate the INIR has little practical use for measuring methane concentrations less than 500 ppm. The MOx sensor is shown to have a logarithmic response to methane concentration change between background and 600 ppm but it is strongly suggested that passively sampling MOx sensors cannot respond fast enough to report concentrations that change in a sub-minute time frame. The NDIR sensor reported a linear change to methane concentration between background and 600 ppm, although there was a noticeable lag in reporting changing concentration, especially at higher values, and individual peaks could be observed throughout the experiment even when the plumes were released 5 s apart. The TDLAS sensor reported all changes in concentration but remains prohibitively expensive. Our findings suggest that each sensor technology could be optimized by either operational design or deployment location to quantify methane emissions. The WATCH4ERS units will be deployed in real-world environments to investigate the utility of each in the future. Full article
(This article belongs to the Special Issue Advanced Gas Sensors for Toxic Organics Detection)
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12 pages, 4518 KiB  
Article
Gas Sensor for Efficient Acetone Detection and Application Based on Au-Modified ZnO Porous Nanofoam
by Zhenchao Sun, Shanfu Sun, Xidong Hao, Yinglin Wang, Caili Gong and Pengfei Cheng
Sensors 2024, 24(24), 8100; https://doi.org/10.3390/s24248100 - 19 Dec 2024
Cited by 1 | Viewed by 929
Abstract
Toxic acetone gas emissions and leakage are a potential threat to the environment and human health. Gas sensors founded on metal oxide semiconductors (MOS) have become an effective strategy for toxic gas detection with their mature process. In the present work, an efficient [...] Read more.
Toxic acetone gas emissions and leakage are a potential threat to the environment and human health. Gas sensors founded on metal oxide semiconductors (MOS) have become an effective strategy for toxic gas detection with their mature process. In the present work, an efficient acetone gas sensor based on Au-modified ZnO porous nanofoam (Au/ZnO) is synthesized by polyvinylpyrrolidone-blowing followed by a calcination method. XRD and XPS spectra were utilized to investigate its structure, while SEM and TEM characterized its morphology. The gas sensitivity of the Au/ZnO sensors was investigated in a static test system. The results reveal that the gas-sensitive performance of porous ZnO toward the acetone can be enhanced by adjusting the loading ratio of noble Au nanoparticles. Specifically, the Au/ZnO sensor prepared by the Au loading ratio of 3.0% (Au/ZnO-3.0%) achieved a 100 ppm acetone gas response of 20.02 at the optimum working temperature of 275 °C. Additionally, a portable electronic device used a STM32 primary control chip to integrate the Au/ZnO-3.0% gas sensor with other modules to achieve the function of detecting and alarming toxic acetone gas. This work is of great significance for efficiently detecting and reducing acetone emissions. Full article
(This article belongs to the Special Issue Advanced Gas Sensors for Toxic Organics Detection)
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