The Challenges and Opportunities for TiO₂ Nanostructures in Gas Sensing

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(4), P. 1644 - 1655

Published: March 19, 2024

Chemiresistive gas sensors based on metal oxides have been widely applied in industrial monitoring, medical diagnosis, environmental pollutant detection, and food safety. To further enhance the sensing performance, researchers worked to modify structure function of material so that it can adapt different types conditions. Among numerous gas-sensitive materials, n-type TiO2 semiconductors are a focus attention for their high stability, excellent biosafety, controllable carrier concentration, low manufacturing cost. This Perspective first introduces mechanism nanostructures composite TiO2-based nanomaterials then analyzes relationship between properties composition, focusing also technical issues such as doping, heterojunctions, functional applications. The applications challenges nanostructured safety, other fields summarized detail. Finally, context practical application challenges, future development technologies new concepts explored, providing ideas directions multifunctional intelligent various fields.

Language: Английский

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P–N Heterojunction formation: Metal Sulfide@Metal Oxide Chemiresistor for ppb H₂S Detection from Exhaled Breath and Food Spoilage at Flexible Room Temperature

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(6), P. 3433 - 3443

Published: June 13, 2024

The development of a portable, low-cost sensor capable accurately detecting H2S gas in exhaled human breath at room temperature is highly anticipated the fields health assessment and food spoilage evaluation. However, achieving outstanding sensing performance applicability for flexible room-temperature operation with parts per billion sensors still poses technical challenges. To address this issue, study involves situ growth MoS2 nanosheets on surface In2O3 fibers to construct p–n heterojunction. In2O3@MoS2-2 exhibits high response 460.61 50 ppm temperature, which 19.5 times higher than that pure 322.1 MoS2. also demonstrates minimum detection limit 3 ppb maintains stable even after being bent 60° angle. These exceptional properties are attributed increase oxygen vacancies chemisorbed nanofibers as well formation heterojunction, modulates heterojunction barrier. Furthermore, study, we successfully applied oral disease conditions, thereby providing new design insights portable evaluating conditions temperature.

Language: Английский

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Advancements in nanohybrid material-based acetone gas sensors relevant to diabetes diagnosis: A comprehensive review

Microchemical Journal, Journal Year: 2024, Volume and Issue: 201, P. 110713 - 110713

Published: May 10, 2024

Language: Английский

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Achieving One Part Per Billion Hydrogen Sulfide (H₂S) Level Detection through Optimizing Composition and Crystallinity of Gold-Decorated Tungsten Trioxide (Au-WO₃) Nanofibers

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(1), P. 292 - 304

Published: Jan. 12, 2024

As a common environmental pollutant and an important breath biomarker for several diseases, it is essential to develop hydrogen sulfide gas sensor with low-ppb level detection limit prevent harmful exposure allow early diagnoses of diseases in low-resource settings. Gold doped/decorated tungsten trioxide (Au-WO3) nanofibers various compositions crystallinities were synthesized optimize H2S-sensing performance. Systematically experimental results demonstrated the ability detect 1 ppb H2S response value (Rair/Rgas) 2.01 using 5 at % Au-WO3 average grain sizes around 15 nm. Additionally, energy barrier difference sensing materials air nitrogen (ΔEb) power law exponent (n) determined be 0.36 eV 0.7, respectively, 450 °C indicating that O– predominately ionic oxygen species adsorption significantly altered Schottky between grain. Such quantitative analysis provides comprehensive understanding mechanism.

Language: Английский

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Metal-organic framework-based biosensing platforms for diagnosis of bacteria-induced infectious diseases

TrAC Trends in Analytical Chemistry, Journal Year: 2024, Volume and Issue: 175, P. 117707 - 117707

Published: April 15, 2024

Language: Английский

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Customizing Wettability of Defect-Rich CeO₂/TiO₂ Nanotube Arrays for Humidity-Resistant, Ultrafast, and Sensitive Ammonia Response

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(2), P. 1014 - 1022

Published: Feb. 9, 2024

In all their applications, gas sensors should satisfy several requirements, including low cost, reduced energy consumption, fast response/recovery, high sensitivity, and reliability in a broad humidity range. Unfortunately, the response/recovery sensing under conditions are often still missing, especially those working at room temperature. this study, humidity-resistant sensor with an ultrafast rate was designed by integrating defect-rich semiconducting interface self-assembled monolayer (SAM) controllable wettability. As proof-of-concept application, ammonia (NH3), one of atmospheric indoor pollutants, selected as target gas. The decoration interconnected defective CeO2 nanowires on spaced TiO2 nanotube arrays (NTAs) provided superior NH3 performances. Moreover, we showed that manipulating functional end group SAMs is efficient simple method to adjust wettability, which 86% sensitivity retention response (within 5 s) limit detection (45 ppb) were achieved even 75% relative This work provides new route toward comprehensive design application metal oxide semiconductors for trace monitoring harsh conditions, such agricultural, environmental, industrial fields.

Language: Английский

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Sensing Performance of Cr_n (n = 1–3) Clusters Doped WSe₂ and WTe₂ for Gases in Power Transformer Winding Deformation Fault by DFT Calculation

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

In order to verify the adsorption effect of WTe2 on fault gas power transformer winding deformation, this paper uses density functional theory (DFT) study and compare mechanism sensing characteristics three gases (CO, CO2, C2H2) surface WSe2 substrates after cluster doping with Crn (n = 1-3). By analyzing binding energy, band structure, distance, DCD DOS two substrate systems, Cr doped is compared. Higher stability conductivity indicate that beneficial for substrates. CO CO2 have best performance among systems Cr2-WSe2, while C2H2 can be captured by Cr3-WTe2. This also analyzes work function, gap energy gap, further verifying changes described in previous article. addition, recovery time sensitivity are used discuss practical application prospects doping, corresponding conclusions obtained. provides a theoretical basis evaluating preventing deformation failures transformers, new insights into whether as mainstream gas-sensitive material engineering fields.

Language: Английский

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Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures

ACS Sensors, Journal Year: 2023, Volume and Issue: 8(10), P. 3952 - 3963

Published: Oct. 6, 2023

Developing a respiratory analysis disease diagnosis platform for the H2S biomarker has great significance real-time detection of various diseases. However, achieving highly sensitive and rapid gas at parts per billion level low temperatures is one most critical challenges developing portable exhaled sensors. Herein, Cu2O-multiwalled carbon nanotube (MWCNT) heterostructures with excellent sensitivity to room temperature lower were successfully synthesized by facile two-dimensional (2D) electrodeposition in situ assembly method. The combination Cu2O MWCNTs via principle optimal conductance growth not only reduced initial resistance material but also provided an ideal interfacial barrier structure. Compared response pure sensor, that Cu2O-MWCNT sensor 1 ppm increased nearly 800 times temperature, time decreased more than 500 s. In addition limits as ppb, was extremely selective low-temperature adaptability. had value 80.6 0.1 -10 °C, which difficult achieve sensors based on oxygen adsorption/desorption mechanisms. used real oral breath, confirming its feasibility monitoring sensor. maximized advantages individual components laid experimental foundation future applications breath platforms H2S.

Language: Английский

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Domain‐Limited Sub‐Nanometer Co Nanoclusters in Defective Nitrogen Doped Carbon Structures for Non‐Invasive Drug Monitoring

Small, Journal Year: 2023, Volume and Issue: 20(16)

Published: Nov. 27, 2023

Abstract In this work, sub‐nanometer Co clusters anchored on porous nitrogen‐doped carbon (C─N─Co NCs) are successfully prepared by high‐temperature annealing and pre‐fabricated template strategies for non‐invasive sensing of clozapine (CLZ) as an efficient substrate adsorption electrocatalyst. The introduction sub‐nanoclusters (Co provides enhanced electrochemical performance better potential compared to structures. Combined with ab initio calculations, it is found that the favorable CLZ catalytic C─N─Co NCs mainly attributed possessing a more stable structure lower conversion barriers oxidized state CLZ. An sensor detection conceptualized wide operating range high sensitivity, monitoring capabilities validated in variety body fluid environments. Based developed system, correlation between blood saliva accuracy investigated gold standard method rat model drug administration, paving way monitoring. This work new insights into development electrocatalysts enable therapy administration personalized healthcare systems.

Language: Английский

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Bio-Sniffers for biomarkers of oral diseases in exhaled breath: State of art and future trends

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 501, P. 215574 - 215574

Published: Dec. 2, 2023

Language: Английский

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