Oxygen Vacancy-Rich Bimetallic Au@Pt Core–Shell Nanosphere-Functionalized Electrospun ZnFe₂O₄ Nanofibers for Chemiresistive Breath Acetone Detection

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(4), P. 2183 - 2193

Published: April 8, 2024

Sensitive and selective acetone detection is of great significance in the fields environmental protection, industrial production, individual health monitoring from exhaled breath. To achieve this goal, bimetallic Au@Pt core–shell nanospheres (BNSs) functionalized-electrospun ZnFe2O4 nanofibers (ZFO NFs) are prepared work. Compared to pure NFs-650 analogue, ZFO NFs/BNSs-2 sensor exhibits a stronger mean response (3.32 vs 1.84), quicker response/recovery speeds (33 s/28 s 54 s/42 s), lower operating temperature (188 273 °C) toward 0.5 ppm acetone. Note that an experimental limit 30 ppb achieved, which ranks among best cases reported thus far. Besides demonstrated excellent repeatability, humidity-enhanced response, long-term stability, selectivity remarkably improved after BNSs functionalization. Through material characterizations DFT calculations, all these improvements could be attributed boosted oxygen vacancies abundant Schottky junctions between NFs BNSs, synergistic catalytic effect BNSs. This work offers alternative strategy realize subppm under high-humidity conditions catering for future requirements noninvasive breath diabetes diagnosis field healthcare.

Language: Английский

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Roadmap for Borophene Gas Sensors

ACS Sensors, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

Borophene, a two-dimensional allotrope of boron, has emerged as promising material for gas sensing because its exceptional electronic properties and high surface reactivity. This review comprehensively overviews borophene synthesis methods, properties, applications. However, it is crucial to acknowledge the substantial gap between abundance theoretical literature limited experimental studies. While investigations have elucidated stability remarkable capabilities various polymorphs across different gases, significant challenges hindered translation these predictions into practical devices. Consequently, this carefully studies shortcomings that are jeopardizing implementation in real-world settings. Specifically, four key issues thoroughly studied, such superficial oxidation upon exposure air, interference from relative humidity on molecule detection, lack selectivity, scalability. Finally, novel strategies proposed overcome bottlenecks. By adopting approaches, can pave way drive advancement next generation

Language: Английский

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Room Temperature and Humidity Resistant NH₃ Detection Based on a Composite of Hydrophobic CNTs with Sulfur Nanosheets

ACS Sensors, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

A composite of sulfur nanosheets (S-NSs) with hydrophobic carbon nanotubes (H-CNTs) was designed, and a chemiresistive gas sensor based on this material constructed for breath analysis NH3 detection at room temperature. Taking advantage the capillary condensation CNTs, effect hexadecyltrimethoxysilane (HDTMS), high sensitivity S-NSs to detection, showed an improved humidity-resistant capacity is capable detecting breath-relevant concentrations down ppb level under humidity. The fabricated exhibited fast response/recovery (18/26 s) good stability. Online monitoring exhaled shows recovery stable baseline, providing potential practical application. research also facilitates development commercial low-cost sensors.

Language: Английский

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Recent progress of gas sensors based on metal oxide composites derived from bimetallic metal-organic frameworks

TrAC Trends in Analytical Chemistry, Journal Year: 2023, Volume and Issue: 166, P. 117199 - 117199

Published: July 20, 2023

Language: Английский

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Physical Confounding Factors Affecting Gas Sensors Response: A Review on Effects and Compensation Strategies for Electronic Nose Applications

Chemosensors, Journal Year: 2023, Volume and Issue: 11(10), P. 514 - 514

Published: Sept. 29, 2023

Electronic noses (e-noses) are devices based on combining different gas sensors’ responses to a given sample for identifying specific odor fingerprints. In recent years, this technology has been considered promising novel tool in several fields of application, but issues still hamper its widespread use. This review paper describes how some physical confounding factors, such as temperature, humidity, and flow, terms flow direction rate, can drastically influence and, consequently, e-nose results. Among the software hardware approaches adopted address issues, compensation strategies proposed literature were critically analyzed. Solutions related modification, design readout, sampling system and/or chamber geometry investigated. A trade-off between loss volatile compounds interest, decrease sensitivity, lack fast need be pointed out. The existing body knowledge suggests that needs highly tailored target application exploit potentialities fully highlights further studies comparing solutions starting point application-driven e-nose-based systems.

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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Low Part-Per-Trillion, Humidity Resistant Detection of Nitric Oxide Using Microtoroid Optical Resonators

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(4), P. 5120 - 5128

Published: Jan. 19, 2024

The nitric oxide radical plays pivotal roles in physiological as well atmospheric contexts. Although the detection of dissolved vivo has been widely explored, highly sensitive (i.e., low part-per-trillion level), selective, and humidity-resistant gaseous air remains challenging. In field, humidity can have dramatic effects on accuracy selectivity gas sensors, confounding data, leading to overestimation concentration. Highly selective NO sensors based laser-induced graphene were recently reported, displaying a limit (LOD) 8.3 ppb. (LOD = 590 ppq) single-wall carbon nanotube these lack resistance. this report, we disclose 2.34 ppt), sensor whispering-gallery mode microtoroid optical resonator. Excellent analyte was enabled via novel ferrocene-containing polymeric coatings synthesized reversible addition–fragmentation chain-transfer polymerization. Utilizing frequency locked whispering evanescent resonator system, microtoroid's real-time resonance shift response tracked with subfemtometer resolution. lowest concentration experimentally detected 6.4 ppt, which is reported date. Additionally, performance remained consistent across different environments. Lastly, impact chemical composition molecular weight sensing evaluated. We anticipate that our results will wide variety fields where important such medical diagnostics through exhaled breath, determination planetary habitability, climate change, quality monitoring, treating cardiovascular neurological disorders.

Language: Английский

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Two-dimensional p-n heterojunctions of black phosphorus nanosheet-sensitized α-MoO3 nanoflake for low-temperature chemiresistive NH3 recognition

Microchemical Journal, Journal Year: 2024, Volume and Issue: unknown, P. 111911 - 111911

Published: Oct. 1, 2024

Language: Английский

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Preparation of Pt/WO₃@ZnO hollow spheres for low-temperature and high-efficiency detection of triethylamine

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(7), P. 3224 - 3235

Published: Jan. 1, 2024

The 1Pt/WZ-2 hollow sphere has a high response of 842 for 50 ppm TEA at 100 °C and good selectivity, providing an efficient composite synthesis method gas detection.

Language: Английский

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Dual enhancement in response and anti-humidity properties of a triethylamine sensor based on trimethoxypropylsilane self-assembled functionalized In2O3

Sensors and Actuators B Chemical, Journal Year: 2024, Volume and Issue: 417, P. 136120 - 136120

Published: June 14, 2024

Language: Английский

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