Physical mechanisms underpinning conductometric gas sensing properties of metal oxide nanostructures

Leturcq, R.; Bhusari, Rutuja; Barborini, E.

doi:10.1080/23746149.2022.2044904

Cited by 4 publications

(2 citation statements)

References 82 publications

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“…Additionally, it is worth noting that the sensor is intended for use at room temperature, and metal oxides respond to VOCs only when they are heated to a high temperature (at least above 120 °C). 52,53 It has been previously demonstrated that the performance of the NP assembly-based sensors is governed by interparticle electron tunneling, 39,50,51,54−59 which implies that the NP coverage, plays a crucial role in the sensing performance. In order to evaluate the effect of NP coverage on the sensitivity of the sensor, three samples were prepared with varying deposition times of 200, 310, and 650 s (designated as samples a, b, and c, respectively) at a deposition rate of 1.4 ± 0.05 Å/s, as shown in Figure S7a in the Supporting Information.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

Xie

Hai

Qian

et al. 2023

ACS Appl. Nano Mater.

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Flexible humidity sensors with high sensitivity, fast response time, and outstanding reliability have the potential to revolutionize electronic skin, healthcare, and non-contact sensing. In this study, we employed a straightforward nanocluster deposition technique to fabricate a resistive humidity sensor on a flexible substrate, using molybdenum oxide nanoparticles (MoO x NPs). We systematically evaluated the humidity-sensing behaviors of the MoO x NP film-based sensor and found that it exhibited exceptional sensing capabilities. Specifically, the sensor demonstrated high sensitivity (18.2 near zero humidity), a fast response/recovery time (1.7/2.2 s), and a wide relative humidity (RH) detection range (0−95%). The MoO x NP film, with its closely spaced granular nanostructure and high NP packing density, exhibited insensitivity to mechanical deformation, small hysteresis, good repeatability, and excellent stability. We also observed that the device exhibited distinct sensing kinetics in the range of high and low RH. Specifically, for RH > 43%, the response time showed a linear prolongation with increased RH. This behavior was attributed to two factors: the higher physical adsorption energy of H 2 O molecules and a multilayer physical adsorption process. In terms of applications, our sensor can be easily attached to a mask and has the potential to monitor human respiration owing to its high sensing performance. Additionally, the sensor was capable of dynamically tracking RH changes surrounding human skin, enabling a non-contact sensing capability. More significantly, we tested an integrated sensor array for its ability to detect moisture distribution in the external environment, demonstrating the potential of our sensor for contactless human−machine interaction. We believe that this innovation is particularly valuable during the COVID-19 epidemic, where cross-infection may be averted by the extensive use of contactless sensing. Overall, our findings demonstrate the tremendous potential of MoO x NP-based humidity sensors for a variety of applications, including healthcare, electronic skin, and non-contact sensing.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…This demonstrates that the MoO x NP film-based humidity sensor exhibits outstanding selectivity for humidity. Additionally, it is worth noting that the sensor is intended for use at room temperature, and metal oxides respond to VOCs only when they are heated to a high temperature (at least above 120 °C). , …”

Section: Resultsmentioning

confidence: 99%

High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

Xie

Hai

Qian

et al. 2023

ACS Appl. Nano Mater.

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Supersonic Cluster Beam Deposition for the Integration of Functional Nanostructured Films in Devices

Barborini,

Vinati

2024

Advances in Fabrication and Investigation of Nanomaterials for Industrial Applications

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Multiscale Covalent Organic Framework (COF) Films for Task-Specific Sensing in Multicomponent Gases

Yu,

Xu,

Zhao

et al. 2024

ACS Materials Lett.

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Gas sensing is vital for ecological protection in agriculture, early disease diagnosis in biomedicine, and safety in industrial production. Covalent organic frameworks (COFs), a new class of porous polymer materials, can be customized through specific ligand selection to tailor pore sizes and active sites, enabling them to selectively enrich and interact with targeted gas molecules, making them promising candidates for gas sensing. To advance their use in this field, it is essential to investigate the mechanisms of the complex interactions between COFs and target molecules as well as to improve COF film fabrication methods. This review outlines design strategies for COF films across multiscale: molecular interaction mechanisms, macroscopic interfacial synthesis methods, and microscale/nanoscale approaches such as double-layer films for filtration and micro/ nanostructured films for improved gas transfer. Finally, several key research directions are proposed to improve the suitability of COF-based materials for gas sensing in complex environments.

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Physical mechanisms underpinning conductometric gas sensing properties of metal oxide nanostructures

Cited by 4 publications

References 82 publications

High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

Supersonic Cluster Beam Deposition for the Integration of Functional Nanostructured Films in Devices

Multiscale Covalent Organic Framework (COF) Films for Task-Specific Sensing in Multicomponent Gases

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Physical mechanisms underpinning conductometric gas sensing properties of metal oxide nanostructures

Cited by 4 publications

References 82 publications

High-Performance Flexible Humidity Sensor Based on MoOx Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

High-Performance Flexible Humidity Sensor Based on MoOx Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

Supersonic Cluster Beam Deposition for the Integration of Functional Nanostructured Films in Devices

Multiscale Covalent Organic Framework (COF) Films for Task-Specific Sensing in Multicomponent Gases

Contact Info

Product

Resources

About

High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing

High-Performance Flexible Humidity Sensor Based on MoO_x Nanoparticle Films for Monitoring Human Respiration and Non-Contact Sensing