Reviews of wearable healthcare systems based on flexible gas sensors

Zheng, Fangcheng; Jiang, Hai-Yan; Yang, Xue-Tong; Guo, Jia-Hui; Sun, Lu; Guo, Yang-Yang; Xu, Hao; Yao, Ming-Shui

doi:10.1016/j.cej.2024.151874

Cited by 2 publications

(1 citation statement)

References 170 publications

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“…Flexible gas-sensors are currently in high demand for wearable applications like healthcare systems. They must possess mechanical flexibility for seamless integration into complex surfaces or wearable devices. , The fabricated sensors maintained their performances under bending at different angles (0°–120°), even after being bent tilted up to 5000 and 1000 times, respectively. Therefore, MXene-based gas sensors have high mechanical flexibility, which is crucial for emerging applications.…”

Section: Mxene-based Gas Sensorsmentioning

confidence: 99%

Resistive Gas Sensors Based on 2D TMDs and MXenes

Mirzaei,

Kim,

Kim

et al. 2024

Acc. Chem. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Gas sensors are used in various applications to sense toxic gases, mainly for enhanced safety. Resistive sensors are particularly popular owing to their ability to detect trace amounts of gases, high stability, fast response times, and affordability. Semiconducting metal oxides are commonly employed in the fabrication of resistive gas sensors. However, these sensors often require high working temperatures, bringing about increased energy consumption and reduced selectivity. Furthermore, they do not have enough flexibility, and their performance is significantly decreased under bending, stretching, or twisting. To address these challenges, alternative materials capable of operating at lower temperatures with high flexibility are needed. Two-dimensional (2D) materials such as MXenes and transition-metal dichalcogenides (TMDs) offer high surface area and conductivity owing to their unique 2D structure, making them promising candidates for realization of resistive gas sensors. Nevertheless, their sensing performance in pristine form is typically weak and unacceptable, particularly in terms of response, selectivity, and recovery time (t rec ). To overcome these drawbacks, several strategies can be employed to enhance their sensing properties. Noble-metal decoration such as (Au, Pt, Pd, Rh, Ag) is a highly promising method, in which the catalytic effects of noble metals as well as formation of potential barriers with MXenes or TMDs eventually contribute to boosted response. Additionally, bimetallic noble metals such as Pt−Pd and Au/Pd with their synergistic properties can further improve sensor performance. Ion implantation is another feasible approach, involving doping of sensing materials with the desired concentration of dopants through control over the energy and dosage of the irradiation ions as well as creation of structural defects such as oxygen vacancies through high-energy ion-beam irradiation, contributing to enhanced sensing capabilities. The formation of core−shell structures is also effective, creating numerous interfaces between core and shell materials that optimize the sensing characteristics. However, the shell thickness needs to be carefully optimized to achieve the best sensing output. To reduce energy consumption, sensors can operate in a self-heating condition where an external voltage is applied to the electrodes, significantly lowering the power requirements. This enables sensors to function in energy-constrained environments, such as remote or low-energy areas. An important advantage of 2D MXenes and TMDs is their high mechanical flexibility. Unlike semiconducting metal oxides that lack mechanical flexibility, MXenes and TMDs can maintain their sensing performance even when integrated onto flexible substrates and subjected to bending, tilting, or stretching. This flexibility makes them ideal for fabricating flexible and portable gas sensors that rigid sensors cannot achieve.

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Section: Mxene-based Gas Sensorsmentioning

confidence: 99%

Resistive Gas Sensors Based on 2D TMDs and MXenes

Mirzaei,

Kim,

Kim

et al. 2024

Acc. Chem. Res.

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Review of Recent Progress on Silicone Rubber Composites for Multifunctional Sensor Systems

Kumar,

Alam,

Park

2024

Polymers

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The latest progress (the year 2021–2024) on multifunctional sensors based on silicone rubber is reported. These multifunctional sensors are useful for real-time monitoring through relative resistance, relative current change, and relative capacitance types. The present review contains a brief overview and literature survey on the sensors and their multifunctionalities. This contains an introduction to the different functionalities of these sensors. Following the introduction, the survey on the types of filler or rubber and their fabrication are briefly described. The coming section deals with the fabrication methodology of these composites where the sensors are integrated. The special focus on mechanical and electro-mechanical properties is discussed. Electro-mechanical properties with a special focus on response time, linearity, and gauge factor are reported. The next section of this review reports the filler dispersion and its role in influencing the properties and applications of these sensors. Finally, various types of sensors are briefly reported. These sensors are useful for monitoring human body motions, breathing activity, environment or breathing humidity, organic gas sensing, and, finally, smart textiles. Ultimately, the study summarizes the key takeaway from this review article. These conclusions are focused on the merits and demerits of the sensors and are followed by their future prospects.

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Reviews of wearable healthcare systems based on flexible gas sensors

Cited by 2 publications

References 170 publications

Resistive Gas Sensors Based on 2D TMDs and MXenes

Resistive Gas Sensors Based on 2D TMDs and MXenes

Review of Recent Progress on Silicone Rubber Composites for Multifunctional Sensor Systems

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