Flexible/wearable resistive gas sensors based on 2D materials

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(20), P. 6528 - 6549

Published: Jan. 1, 2023

Flexible/wearable gas sensor technology is gaining huge interest in the current era of Internet Things for its applications personal environmental monitoring, healthcare, and safety.

Language: Английский

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Synergistic Effect of Electron Scattering and Space Charge Transfer Enabled Unprecedented Room Temperature NO₂ Sensing Response of SnO₂

Small, Journal Year: 2023, Volume and Issue: 19(48)

Published: July 4, 2023

Metal oxide gas sensors have long faced the challenge of low response and poor selectivity, especially at room temperature (RT). Herein, a synergistic effect electron scattering space charge transfer is proposed to comprehensively improve sensing performance n-type metal oxides toward oxidizing NO2 (electron acceptor) RT. To this end, porous SnO2 nanoparticles (NPs) assembled from grains about 4 nm with rich oxygen vacancies are developed through an acetylacetone-assisted solvent evaporation approach combined precise N2 air calcinations. The results show that as-fabricated NPs sensor exhibits unprecedented -sensing performance, including outstanding (Rg /Ra = 772.33 @ 5 ppm), fast recovery (<2 s), extremely detection limit (10 ppb), exceptional selectivity (response ratio >30) Theoretical calculation experimental tests confirm excellent mainly attributed unique transfer. This work proposes useful strategy for developing high-performance RT using oxides, provides in-depth understanding basic characteristics on sensing, paving way efficient power consumption

Language: Английский

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Advancements in Improving Selectivity of Metal Oxide Semiconductor Gas Sensors Opening New Perspectives for Their Application in Food Industry

Sensors, Journal Year: 2023, Volume and Issue: 23(23), P. 9548 - 9548

Published: Dec. 1, 2023

Volatile compounds not only contribute to the distinct flavors and aromas found in foods beverages, but can also serve as indicators for spoilage, contamination, or presence of potentially harmful substances. As odor food raw materials products carries valuable information about their state, gas sensors play a pivotal role ensuring safety quality at various stages its production distribution. Among detection devices that are widely used industry, metal oxide semiconductor (MOS) greatest importance. Ongoing research development efforts have led significant improvements performance, rendering them immensely useful tools monitoring product quality; however, aspects related limited selectivity still remain challenge. This review explores strategies technologies been employed enhance MOS sensors, encompassing innovative sensor designs, integration advanced materials, improvement measurement methodology pattern recognize algorithms. The discussed advances such reducing cross-sensitivity interfering gases, improving limits, providing more accurate assessment volatile organic (VOCs) could lead further expansion applications variety areas, including processing storage, ultimately benefiting both industry consumers.

Language: Английский

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Semiconductor Gas Sensors for Detecting Chemical Warfare Agents and Their Simulants

Sensors, Journal Year: 2023, Volume and Issue: 23(6), P. 3272 - 3272

Published: March 20, 2023

On-site detection of chemical warfare agents (CWAs) can be performed by various analytical techniques. Devices using well-established techniques such as ion mobility spectrometry, flame photometry, infrared and Raman spectroscopy or mass spectrometry (usually combined with gas chromatography) are quite complex expensive to purchase operate. For this reason, other solutions based on well suited portable devices still being sought. Analyzers simple semiconductor sensors may a potential alternative the currently used CWA field detectors. In type, conductivity layer changes upon interaction analyte. Metal oxides (both in form polycrystalline powders nanostructures), organic semiconductors, carbon nanostructures, silicon composites that combination these materials material. The selectivity single oxide sensor adjusted specific analytes within certain limits appropriate material sensitizers. This review presents current state knowledge achievements for detection. article describes principles operation sensors, discusses individual present scientific literature makes critical comparison them. prospects development practical application technique analysis also discussed.

Language: Английский

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Advanced NH₃ Detection by 1D Nanostructured La:ZnO Sensors with Novel Intrinsic p–n Shifting and Ultrahigh Baseline Stability

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(2), P. 895 - 911

Published: Jan. 31, 2024

Due to its stability, transportability, and ability be produced using renewable energy sources, NH3 has become an attractive option for hydrogen production storage. Detecting is then essential, being a toxic flammable gas that can pose dangers if not properly monitored. ZnO chemiresistive sensors have shown great potential in real monitoring applications; yet, research development this area are ongoing due reported limitations, like baseline instabilities sensitivity environmental factors, including temperature, humidity, interferent gases. Herein, we suggest approach obtain with competitive performance based on semiconducting metal oxides. For purpose, one-dimensional nanostructured pure La-doped films were synthesized hydrothermally. Incorporating large rare earth ions, La, into the bulk lattice of challenging lead surface defects influential gas-sensing reactions. The experienced temperature-induced p–n shifting at about 100 °C, verified by Hall effect AC impedance measurements. doped sensor showed exceptional stepwise stability outstanding relatively low operating temperature (150 °C) sensing response 91 best (@ 50 ppm NH3) recorded tolerance water vapor up 70% RH. Alongside shifting, enhanced was discussed correlation La doping-triggered changes nanostructural surfacial properties films. We validated proposed technique producing similar performing multiple replicates ensure consistency reproducibility. also introduced fill factor concept field as new trustworthy parameter could improve assessment help rate deviation from ideality.

Language: Английский

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Electrospun ZnO hollow nanofibers gas sensors: An overview

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1001, P. 175201 - 175201

Published: June 15, 2024

Language: Английский

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SnO2 hollow hemispheres derived from Sn-MOFs for ultrasensitive chlorine detection

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 115474 - 115474

Published: Jan. 1, 2025

Language: Английский

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Advancements in Nanostructured Functional Constituent Materials for Gas Sensing Applications: A Comprehensive Review

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(5), P. 2522 - 2522

Published: Feb. 26, 2025

The unique properties of nanostructures, such as their high surface-to-volume ratio, tunable physical and chemical characteristics, enhanced sensitivity, are critical for advancing gas detection technologies. Therefore, this comprehensive review explores the recent advancements in nanostructured materials, emphasizing pivotal role enhancing sensing performance. A key focus is metal oxide-based sensors, impact synthesis methods (micro)structural on sensor performance thoroughly examined. By segmenting discussion into 1D including different oxides, provides a broad yet detailed perspective how functional materials contribute to efficiency. From standpoint, highlights parameters, mechanisms, response times, selectivity, stability, operating conditions. High-end values may reach around few ppb most gases. Beyond evaluating current advancements, also addresses existing challenges future research directions, particularly scalability, long-term low-temperature operation, integration real-world applications. providing up-to-date analysis, serves valuable resource researchers engineers, offering insights that can drive next generation high-performance, reliable, selective sensors.

Language: Английский

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Recent advances in multifunctional materials for gas sensing applications

Journal of environmental chemical engineering, Journal Year: 2022, Volume and Issue: 10(6), P. 108543 - 108543

Published: Sept. 7, 2022

Language: Английский

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N-Doped Graphene and Its Derivatives as Resistive Gas Sensors: An Overview

Chemosensors, Journal Year: 2023, Volume and Issue: 11(6), P. 334 - 334

Published: June 5, 2023

Today, resistance gas sensors which are mainly realized from metal oxides among the most used sensing devices. However, generally, their temperature is high and other materials with a lower operating can be an alternative to them. Graphene its derivatives 2D structure encouraging for gas-sensing purposes, because lattice surface area maximize interaction between gas, small variation in carrier concentration of graphene cause notable modulation electrical conductivity graphene. they show weak performance pristine form. Hence, doping, particular N one promising strategies enhance features graphene-based sensors. Herein, we discuss properties N-doped derivatives. doping induce band gap inside graphene, generate defects, all factors beneficial studies. Additionally, not only experimental research reviewed this review paper, but theoretical works about also discussed.

Language: Английский

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