Single-atom catalysts: promotors of highly sensitive and selective sensors

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(15), P. 5088 - 5134

Published: Jan. 1, 2023

Sensors, the underlying technology that supports Internet of Things, are undergoing multi-disciplinary integration development to constantly improve efficiency human production and life. Simultaneously, application scenarios in emerging fields such as medical diagnosis, environmental monitoring industrial safety put forward higher requirements for sensing capabilities. Over last decade, single-atom catalysts (SACs) have attracted tremendous attention environment energy due their high atom utilization efficiencies, controllable active sites, tailorable coordination environments structural/chemical stability. These extraordinary characteristics extend sensitivity selectivity sensors beyond current limitations. Here, we start with working principles SAC-based sensors, summarize relationship between sensor performance intrinsic properties SACs, followed by an overview design strategy development. We then review recent advances different highlight future opportunities challenges exciting applications.

Language: Английский

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Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(12), P. 10698 - 10712

Published: June 13, 2023

Two-dimensional molybdenum disulfide (MoS2) with high surface area and layered structure has received substantial attention for its potential use in detecting volatile organic compounds (VOCs) trace gases good relative response selectivity at room temperature. However, two of the long-standing challenges to broader MoS2 are poor recovery kinetics susceptibility oxidation a humid environment. To address these issues, we present chemiresistive sensor based on MoS2/SWCNTs composite as sensing material dual detection N,N-dimethylformamide (DMF) ammonia (NH3) supports SWCNTs by providing superhydrophobic imparting environmental stability along an increased specific area. The composite-based 4 wt % enabled DMF NH3 down 0.1 1 ppm, respectively, under ambient conditions. Upon exposure 5 ppm (response ≈15%), this exhibited p-type conduction times 160 140 s, whereas, ≈25%, n-type), were 126 35 respectively. Moreover, against various oxidizing reducing agents well repeatability, long-term stability, fast reversibility varied gas atmospheres. We attribute enhanced performance formation numerous p–n interfaces synergy between nanomaterials. This improves charge transport leads faster response. experimental work was supplemented machine learning-based principal component analysis (PCA) model, which us identify key dependent variables confirm sensor's selectivity. These results provide platform developing next-generation sensors diverse gas-sensing applications.

Language: Английский

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Concentration-Guided Visual Detection of Multiphase Aliphatic Biogenic Amines through Amine–Phenol Recognition Using a Dual-State Emitter

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(13), P. 16492 - 16504

Published: March 21, 2023

Intermolecular amine-phenol interactions are largely recognized as unique models with diverse supramolecular interactions. However, fluorescence (FL) variations originating from such rare. Herein, FL changes well realized to identify an important biomarker, biogenic amines (BAs). A simple, inexpensive, and thermally stable anthracenylphosphonate is linked 2,2'-biphenol design a functional dual-state emitter. Among the various tested, this emitter displays superior sensitivity lowest possible limit of detection 5.8-9.7 ppb aliphatic polyamines 1,3-, 1,4-, 1,5-, 1,6- diamines spermidine in solution phase. Fast, on-spot BA vapors was visually conducted through notable high-contrast change blue yellow emission solid state. FT-IR, 1H/31P NMR, mass spectroscopic studies ground-state The failure 2,2'-dimethoxy-biphenyl-linked analog verifies role Mechanistic determine ground excited states. molecular structure packing doubly twisted probe documented substantial void space facilitating close contact BAs strong desired for efficient detection. Finally, governs freshness piece Catla catla fish prawn. Further, remarkable concentration-controlled red shift difference 141 nm detected 1,3-diaminopropane (1,3-DAP) vapor (from 29 319 mg/L) first time. Thus, cost-effective device developed detect 1,3-DAP at precise concentration, visible naked eye.

Language: Английский

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Understanding the Mechanisms and Applications of Luminescent Covalent Organic Frameworks (COFs) for Multi-Analyte Sensing

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1321, P. 139945 - 139945

Published: Sept. 7, 2024

Language: Английский

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In Situ Optical Detection of Amines at a Parts-per-Quadrillion Level by Severing the Through-Space Conjugated Supramolecular Domino

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(4), P. 2604 - 2614

Published: Jan. 17, 2024

Conventional fluorophores suffer from low sensitivity and selectivity in amine detection due to the inherent limitations their "one-to-one" stoichiometric sensing mechanism. Herein, we propose a "one-to-many" chain reaction-like mechanism by creating domino consisting of one fluorescent molecule (e.g., PTF1) up 40 nonemissive polymer chains (pPFPA) comprising over thousand repeating units (PFPA). PTF1 (the trigger) interacts with adjacent PFPA following blocks) through polar−π interactions initiates effect, effective through-space conjugation along pPFPA generating amplified yellow signals charge transfer between pPFPA. Amine exposure causes rapid dismantling fluorophore-pPFPA-based significantly reduces emissions, thus providing an ultrasensitive method for detecting amines. Relying on above merits, achieve limit 177 ppq (or 1.67 × 10–12 M) triethylamine, which is nearly 4 orders lower than that previous methods. Additionally, distinct reactivity toward different amines allows discrimination primary, secondary, tertiary This study presents "domino effect" has not yet been reported provides general approach chemical beyond reach conventional

Language: Английский

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Machine Learning Techniques for Improving Nanosensors in Agroenvironmental Applications

Agronomy, Journal Year: 2024, Volume and Issue: 14(2), P. 341 - 341

Published: Feb. 7, 2024

Nanotechnology, nanosensors in particular, has increasingly drawn researchers’ attention recent years since it been shown to be a powerful tool for several fields like mining, robotics, medicine and agriculture amongst others. Challenges ahead, such as food availability, climate change sustainability, have promoted pushed forward the use of agroindustry environmental applications. However, issues with noise confounding signals make these tools non-trivial technical challenge. Great advances artificial intelligence, more particularly machine learning, provided new that allowed researchers improve quality functionality nanosensor systems. This short review presents latest work analysis data from using learning agroenvironmental It consists an introduction topics application field nanosensors. The rest paper examples techniques utilisation electrochemical, luminescent, SERS colourimetric classes. final section discussion conclusion concerning relevance material discussed future sector.

Language: Английский

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Live-tracking of beef freshness by sub-ppb level ammonia detection using WS₂/rGO nanoflakes incorporating edge site-enriched acidic sulfur

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(18), P. 11004 - 11019

Published: Jan. 1, 2024

Highly accurate, easily accessible room temperature wireless gas-sensing technology can be utilized to monitor food freshness in real time prevent fraud and spoiled consumption, thus safeguarding humans from diseases.

Language: Английский

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Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(8), P. 3994 - 4006

Published: July 23, 2024

Detecting and distinguishing between hazardous gases with similar odors by using conventional sensor technology for safeguarding human health ensuring food safety are significant challenges. Bulky, costly, power-hungry devices, such as that used gas chromatography-mass spectrometry (GC-MS), widely employed sensing. Using a single chemiresistive semiconductor or electric nose (e-nose) to achieve this objective is difficult, mainly because of its selectivity issue. Thus, there need develop new materials tunable versatile sensing characteristics. Phase engineering two-dimensional better utilize their physiochemical properties has attracted considerable attention. Here, we show MoSe

Language: Английский

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Miniature Optical Fiber Fabry–Perot Interferometer Based on a Single-Crystal Metal–Organic Framework for the Detection and Quantification of Benzene and Ethanol at Low Concentrations in Nitrogen Gas

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(10), P. 13071 - 13081

Published: March 3, 2024

This study reports for the first time, to best of our knowledge, a real-time detection ultralow-concentration chemical gases using fiber-optic technology, combining miniaturized Fabry–Perot interferometer (FPI) with metal–organic frameworks (MOFs). The sensor consists short and thick-walled silica capillary segment spliced lead-in single-mode fiber (SMF), housing tiny single crystal HKUST-1 MOF, imparting chemoselectivity features. Ethanol benzene were tested, resulting in shift FPI interference signal. demonstrated high sensitivity, detecting ethanol gas concentrations (EGCs) sensitivity 0.428 nm/ppm between 24.9 40.11 ppm (BGCs) 0.15 99 124 ppm. selectivity involved combination three ultralow ethanol, benzene, toluene gases, revealing an enhancement factor 436% 140% toluene, attributed improved miscibility these conjugated ring molecules alkane chains ethanol-modified HKUST-1. Experimental tests confirmed sensor's viability, demonstrating significantly response time spectral characteristics through polishing, indicating its potential quantifying at concentrations. technology may prevent energy resource losses, small size robust construction make it applicable confined hazardous locations.

Language: Английский

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A novel dual-channel cassava starch/polyvinyl alcohol-based film for visual monitoring of shrimp freshness

Carbohydrate Polymers, Journal Year: 2024, Volume and Issue: 335, P. 122107 - 122107

Published: April 1, 2024

Language: Английский

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