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A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Applied Chemical Sensors".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 22347

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Special Issue Editors

Prof. Dr. Xiaoxing Zhang

E-Mail Website1 Website2
Guest Editor

1. State Key Lab oratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
3. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
Interests: nanomaterials-based gas sensors; 2D structures; chemical sensors and biosensors; typical sensors in high-voltage devices; sensing experiment; first-principles theory; optical gas sensors

Dr. Hao Cui

E-Mail Website
Guest Editor

College of Artificial Intelligence, Southwest University, Chongqing 400715, China
Interests: 2D nanomaterials-based gas sensors; toxic gas sensors; typical gas sensors in high-voltage devices; first-principles theory

Special Issue Information

Dear Colleagues,

Gas sensors have traditionally played a major role in areas such as environmental monitoring, daily safety, industrial security and operation status evaluation of several typical devices, among others. With the growing interest in the gas sensing field comes the development of more techniques to prepare novel and advanced gas sensors for application in environmental protection, various industries and our daily lives.

To further progress the application of gas sensors, advancement in the following areas should be sought: first, miniaturization of MEMS gas sensors has become popular in recent years, and they can thus be largely developed; second, the application of new materials and the exploration of novel sensing materials is crucial to the continual improvement of gas sensing devices’ quality; and third, advanced algorithms should be applied to obtain more valuable information and improve gas sensors’ performance.

Furthermore, gas sensors still present some limits, such as low sensitivity and selectivity, a long response time and an uncertain sensing mechanism. Therefore, the exploration of novel sensing methods, such as nanosensing techniques and optical sensing methods, could aid the development of advanced sensing techniques and facilitate the progress of material science and optics. Sensing experiments and theoretical simulations are crucial to constructing a comprehensive understanding of sensing mechanisms and the properties of sensing candidates. Moreover, sensor arrays and algorithms should be constructed to resolve the issue of selectivity among gases. In addition, gas sensors’ application should be extended, especially for their use in harsh environments. Such research is imperative to the further development of gas sensors.

The aim of this Special Issue, “Application and Advance of Gas Sensors”, is therefore to highlight and share new approaches, solutions and applications of gas sensors in a range of fields, with the hope of resolving sensors’ low sensitivity and selectivity and improving their intelligence. Experimental and theoretical research will be prioritized for this Special Issue.

Both review articles and research papers are welcome.

Prof. Dr. Xiaoxing Zhang
Dr. Hao Cui
Guest Editors

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Keywords

nanomaterials-based gas sensors
advanced 2D sensing materials
typical sensors in high-voltage devices
optical gas sensors
chemical gas sensors
first-principles theory
sensor arrays and algorithms

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Published Papers (11 papers)

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Research

19 pages, 7122 KiB

Open AccessArticle

Preparation of 2-Butanone Gas Sensor Based on Ag-Decorated In₂O₃ Nanocube with High Response and Low Detection Level

by Hua Zhang, Yinghao Guo, Hongliang Gao and Fanli Meng

Chemosensors 2023, 11(5), 288; https://doi.org/10.3390/chemosensors11050288 - 11 May 2023

Cited by 3 | Viewed by 1750

Abstract

In this work, 2-butanone-sensitive Ag-decorated In₂O₃ nanocomposites were successfully prepared using a facile one-step hydrothermal method to enhance the sensing performance of In₂O₃ nanocubes. The methods of scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) analysis, and X-ray photoelectron spectroscopy (XPS) were used to observe the morphology, microstructure, crystalline phase, and the existing state of the elements in the produced nanomaterials, respectively. The gas sensing test results show that the prepared compounds could respond to 100 ppm of 2-butanone with a high response (242), fourfold that of the pure In₂O₃ material, at the optimum working temperature of 240 °C. Moreover, the Ag@In₂O₃-based sensor also showed excellent selectivity, good repeatability, and even long-term stability. In addition, noble metal surface modification not only decreased the optimum operating temperature (from 270 °C to 240 °C) but also decreased the lowest detection limit (from 5 ppm to 0.25 ppm). In the final section, the gas sensing mechanism of the Ag@In₂O₃-based sensor and the probable reason for 2-butanone’s enhanced sensing properties are both discussed. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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15 pages, 15419 KiB

Open AccessEditor’s ChoiceArticle

Perovskite-Structured NiTiO₃ Modified NiO Gas Sensor for Xylene Detection

by Liyun Qin, Hongliang Gao and Fanli Meng

Chemosensors 2023, 11(5), 264; https://doi.org/10.3390/chemosensors11050264 - 29 Apr 2023

Cited by 14 | Viewed by 1961

Abstract

Xylene gas is highly toxic, can irritate the skin, and is also very harmful to the body. Therefore, it is necessary to prepare sensors that can accurately detect xylene. In this paper, NiTiO₃ nanoparticles were synthesized by the hydrothermal method and used to modify NiO, and a NiTiO₃-modified NiO (NiTiO₃-NiO) nanosheet material was successfully prepared. Its microstructure and internal composition were observed and analyzed by various characterization methods. When detecting 100 ppm xylene gas at the optimum temperature, comparing the response level of the NiTiO₃-NiO sensor with that of a pure nickel oxide sensor, the former was 20 times that of the latter, and the sensitivity was greatly improved. In a 100 ppm xylene gas environment, the response level of the sensor reached 21, the minimum detection limit was 1 ppm, and the recovery time was 135.75 s. NiTiO₃ is a perovskite-structured material, with many active sites and good catalytic properties that promote redox reactions. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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12 pages, 4498 KiB

Open AccessArticle

Study on the Detection Characteristics and Response Mechanism of SnS₂-Based Sensors for SO₂ and SOF₂

by Chengjun Li, Mengyang He, Shuangshuang Tian, Jiawei Yuan, Jincong Wang and Yi Li

Chemosensors 2022, 10(12), 526; https://doi.org/10.3390/chemosensors10120526 - 11 Dec 2022

Cited by 5 | Viewed by 1421

Abstract

Based on the wide application of sulfur hexafluoride (SF₆) gas in the power industry, the analysis and detection of its decomposition components have become important technical means for state detection and fault evaluation of gas-insulated equipment. The gas-sensitive characteristics and adsorption mechanism of the SnS₂ sensor for SO₂ and SOF₂ gases were investigated using SO₂ and SOF₂, the main SF₆ decomposition components, as the target detection gases. SnS₂ gas-sensitive materials and components were prepared, and the temperature response, concentration response, response recovery and stability of the SnS₂ sensor for the two SF₆ decomposition components were tested based on the gas-sensitive test platform. The results demonstrate that the sensor had the best working performance at 200 °C, with obvious response and ideal recovery for both target gases and good stability in a certain time. Based on the first principle, the SnS₂ surface structure model and the target gas adsorption model were established, and the adsorption mechanism was analyzed in terms of frontier molecular orbital theory to verify the correctness of the gas-sensitive test results. The gas-sensitive test analysis and simulation calculation can provide data basis and theoretical support for the study of SF₆ decomposition components detected by gas sensors. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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11 pages, 2875 KiB

Open AccessArticle

Hydrogen-Sensing Properties of Ultrathin Pt-Co Alloy Films

by Mustafa Erkovan, Caner Deger, Susana Cardoso and Necmettin Kilinc

Chemosensors 2022, 10(12), 512; https://doi.org/10.3390/chemosensors10120512 - 2 Dec 2022

Cited by 3 | Viewed by 2288

Abstract

The present work aims to investigate the feasibility of utilizing Pt and PtCo alloy ultrathin films as hydrogen gas sensors in order to reduce the cost of the hydrogen gas sensors by using low-cost metallic materials. In this study, ultrathin Pt and PtCo alloy thin films are evaluated for hydrogen sensors. The stoichiometry and structural characterization of the thin films are observed from XPS, SEM, and EDX measurements. The 2-nm-thick Pt and PtCo films deposited by sputtering onto Si/SiO₂ covers homogeneously the surface in an fcc crystalline plane (111). The hydrogen gas-sensing properties of the films are assessed from the resistance measurement between 25 °C and 150 °C temperature range, under atmospheres with hydrogen concentration ranging from 10 ppm to 5%. The hydrogen-sensing mechanism of ultrathin Pt_xCo_1-x alloy films can be elucidated with the surface scattering phenomenon. PtCo thin alloy films show better response time than pure Pt thin films, but the alloy films show lower sensor response than pure Pt film’s sensor response. Aside from these experimental investigations, first-principles calculations have also been carried out for bare Pt and Co, and also PtCo alloys. Compared to the theoretical calculations, the sensor response to change decreases with increasing Co content, a result that is compatible with the experimental results. In an attempt to explain the decrease in the sensor response of PtCo alloy films compared to bare Pt film, a variety of different phenomena are discussed, including the shrinking lattice of the structure or dendritic surface structure of PtCo alloy films by the increasing cobalt ratio. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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12 pages, 2857 KiB

Open AccessArticle

The Role of the Synthesis Routes on the CO-Sensing Mechanism of NiO-Based Gas Sensors

by Adelina Stanoiu, Corneliu Ghica, Catalina Gabriela Mihalcea, Daniela Ghica and Cristian Eugen Simion

Chemosensors 2022, 10(11), 466; https://doi.org/10.3390/chemosensors10110466 - 9 Nov 2022

Cited by 2 | Viewed by 1774

Abstract

In this study, two alternative synthesis routes have been used in obtaining gas-sensitive NiO materials. The structural and morphological aspects were systematically investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), revealing significant differences further mirrored in their sensing performances. Simultaneous electrical resistance and contact potential differences have been involved aiming to decouple the energetic contributions: work function (ΔΦ), surface band bending (qΔVs) and electron affinity (Δχ). Two sensing mechanism scenarios explained the enhancement and downgrading in the sensor response to carbon monoxide (CO) concerning the synthesis strategies. The role of relative humidity (RH) was considered throughout the electrical operando (in-field) investigations. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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12 pages, 5866 KiB

Open AccessArticle

Ru-Doped PtTe₂ Monolayer as a Promising Exhaled Breath Sensor for Early Diagnosis of Lung Cancer: A First-Principles Study

by Qianqian Wan, Xiaoqi Chen and Song Xiao

Chemosensors 2022, 10(10), 428; https://doi.org/10.3390/chemosensors10100428 - 17 Oct 2022

Cited by 8 | Viewed by 1840

Abstract

Using the first-principles theory, the geometric and electronic properties of the Ru-doped PtTe₂ (Ru-PtTe₂) monolayer, and its sensing performance for three VOCs biomarkers, namely, 2-propenal (C₃H₄O), acetone (C₃H₆O) and isoprene (C₅H₈), were analyzed, to expound its potential for exhaled breath analysis and diagnosis of lung cancer. It was found that the Ru-substitution on the surface of the pristine PtTe₂ surface with a Te atom is energy-favorable, with the formation energy of −1.22 eV. Upon adsorption of the three VOC gas species, chemisorption was identified with the adsorption energies of −1.72, −1.12 and −1.80 eV for C₃H₄O, C₃H₆O and C₅H₈, respectively. The Ru-doping results in a strong magnetic property for the PtTe₂ monolayer, whereas the gas adsorption eliminates this magnetic behavior. The electronic properties reveal the sensing mechanism of the Ru-PtTe₂ monolayer for gas detection, and the bandgap change indicates its admirable positive sensing response for the three gas species. Therefore, we conclude that the Ru-PtTe₂ monolayer is a promising sensing material to realize the diagnosis of lung cancer through exhaled gas detection, with a remarkable decrease in its electrical conductivity. This work paves the way for further exploration of the PtTe₂-based gas sensor for early diagnosis of lung cancer, and we hope that more sensing materials can be investigated using the PtTe₂ monolayer. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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12 pages, 36619 KiB

Open AccessArticle

Adsorption and Sensing of CO₂, CH₄ and N₂O Molecules by Ti-Doped HfSe₂ Monolayer Based on the First-Principle

by Yingxiang Wang, Benli Liu, Rengcun Fang, Lin Jing, Peng Wu and Shuangshuang Tian

Chemosensors 2022, 10(10), 414; https://doi.org/10.3390/chemosensors10100414 - 12 Oct 2022

Cited by 13 | Viewed by 2085

Abstract

With the continuous emission of greenhouse gases, the greenhouse effect is becoming more and more serious. CO₂, CH₄, and N₂O are three typical greenhouse gases, and in order to limit their emissions, it is imperative that they are accurately monitored. In this paper, the doping behavior of Ti on the surface of HfSe₂ is investigated, based on the first-nature principle. Additionally, the parameters of adsorption energy and the transfer charges of Ti−HfSe₂ for CO₂, CH₄, and N₂O are calculated and compared, while the sensing characteristics of Ti−HfSe₂ are analyzed. The results show that the structure is most stable when Ti is located above the lower-layer Se atom. The CO₂ and N₂O adsorption systems with large adsorption energies and transfer charges are a chemical adsorption, while the CH₄ system is a physical adsorption with small adsorption energies and transfer charges. In addition, Ti−HfSe₂ has a good sensitivity and recovery time for CO₂ at 298 K, which is feasible for industrial application. All the contents of this paper provide theoretical guidance for the implementation of Ti−HfSe₂ as a gas-sensitive material for the detection of greenhouse gas components. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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11 pages, 2527 KiB

Open AccessArticle

Mo₂C-Based Microfluidic Gas Sensor Detects SF₆ Decomposition Components: A First-Principles Study

by Li Liu, Guozhi Zhang, Zengting Wang, Jiawei Yuan, Senyuan Tan and Yi Li

Chemosensors 2022, 10(9), 368; https://doi.org/10.3390/chemosensors10090368 - 16 Sep 2022

Cited by 6 | Viewed by 1883

Abstract

Mo₂C is a two-dimensional material with high electrical conductivity, low power consumption, and catalytic effect, which has promising applications in the field of microfluidic gas detection. First principles were used to study the adsorption characteristics of Mo₂C monolayer on four typical decomposition gases of SF₆ (H₂S, SO₂, SOF₂, and SO₂F₂), and to explore the feasibility of its application in the detection of SF₆ decomposition components. The results showed that Mo₂C chemisorbed all four gases, and the adsorption capacity was H₂S < SO₂ < SOF₂ < SO₂F₂. The adsorption mechanism of Mo₂C as a microfluidic sensor was analyzed in combination with its charge-density difference and density of states. On the other hand, the different work-function change trends after adsorbing gases provide the possibility for Mo₂C to selectively detect gases as a low-power field-effect transistor sensor. All content can be used as theoretical guidance in the realization of Mo₂C as a gas-sensitive material for the detection of SF₆ decomposition components. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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10 pages, 1457 KiB

Open AccessArticle

Ni-Decorated ZnO Monolayer for Sensing CO and HCHO in Dry-Type Transformers: A First-Principles Theory

by Jin Zhang, Yuqing Wang, Zhuo Wei, Qi Wang, Zhengbo Liang and Tian Yuan

Chemosensors 2022, 10(8), 307; https://doi.org/10.3390/chemosensors10080307 - 2 Aug 2022

Cited by 2 | Viewed by 1693

Abstract

This work implements first-principles simulations in order to investigate the Ni-decorating property on the ZnO monolayer and the sensing property of the Ni-decorated ZnO (Ni–ZnO) monolayer upon CO and HCHO molecules formed in the dry-type transformers. The results reveal that the Ni dopant is stably anchored on the T_O site of the ZnO surface forming the Ni–Zn and Ni–O bonds with the binding energy (E_b) of −1.75 eV. Based on the adsorption energy (E_ad) of −1.49 and −2.22 eV for CO and HCHO on the Ni–ZnO monolayer, we determined the chemisorption for two such systems. The band structure (BS) and atomic density of state (DOS) of the gas adsorbed systems are analyzed to comprehend the electronic property of the Ni–ZnO monolayer in the gas adsorptions. Besides, the change of bandgap and work function uncover the sensing potential of Ni–ZnO monolayer upon CO and HCHO detections, with admirable electrical response (15,394.9% and −84.6%). The findings in this work manifest the potential of Ni–ZnO monolayer for CO and HCHO sensing to evaluate the operation condition of the dry-type transformers. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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15 pages, 4902 KiB

Open AccessEditor’s ChoiceArticle

Synthesis of ZIF-8 Coating on ZnO Nanorods for Enhanced Gas-Sensing Performance

by Bo Huang, Wen Zeng and Yanqiong Li

Chemosensors 2022, 10(8), 297; https://doi.org/10.3390/chemosensors10080297 - 30 Jul 2022

Cited by 11 | Viewed by 2756

Abstract

Firstly, ZnO nanorods were prepared by a relatively simple method, and then self-sacrificed by a water bath heating method to generate a commonly used porous ZIF-8 and firmly attached to the ZnO surface. The successful synthesis of synthetic composites was demonstrated with various detection methods. The gas-sensing results show that the ZIF-8-coated ZnO with a core-shell structure exhibits better response than the raw ZnO because of the increased specific surface area and active sites. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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12 pages, 2922 KiB

Open AccessArticle

Dissolved Gas Analysis in Transformer Oil Using Ni Catalyst Decorated PtSe₂ Monolayer: A DFT Study

by Zengting Wang, Guozhi Zhang, Li Liu, Yunjian Wu, Jincong Wang and Song Xiao

Chemosensors 2022, 10(8), 292; https://doi.org/10.3390/chemosensors10080292 - 25 Jul 2022

Cited by 8 | Viewed by 2030

Abstract

In this paper, the first-principles theory is used to explore the adsorption behavior of Ni catalyst decorated PtSe₂ (Ni-PtSe₂) monolayer toward the dissolved gas in transformer oil, namely CO and C₂H₂. Some Ni atoms from the catalyst are trapped in the Se vacancy on the pure PtSe₂ surface. The geometry configurations of Ni-PtSe₂ monolayer before and after gas adsorption, the electronic property of Ni-PtSe₂ monolayer upon gas adsorption, and the sensibility and recovery property of Ni-PtSe₂ monolayer are explored in this theoretical work. Through the simulation, the

E_{ad}

of CO and C₂H₂ gas adsorption systems are calculated as −1.583 eV and −1.319 eV, respectively, both identified as chemisorption and implying the stronger performance of the Ni-PtSe₂ monolayer on CO molecule, which is further supported by the DOS and BS analysis. According to the formula, the sensitivity of Ni-PtSe₂ monolayer towards CO and C₂H₂ detection can reach up to 96.74% and 99.91% at room temperature (298 K), respectively, which manifests the favorable sensing property of these gases as a chemical resistance-type sensor. Recovery behavior indicates that the Ni-PtSe₂ monolayer is a satisfied gas scavenger upon the noxious gas dissolved in transformer oil, but its recovery time at room temperature is not satisfactory. To sum up, we monitor the status of the transformer to guarantee the stable operation of the power system through the Ni-PtSe₂ monolayer upon the detection of CO and C₂H₂, which may realize related applications, and provide the basis and reference to cutting-edge research in the field of electricity in the future. Full article

(This article belongs to the Special Issue Application and Advance of Gas Sensors)

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