<scp>Carbon‐nanotube‐loaded</scp> planar gas and humidity sensor

Ge, Wenping; Pei, Lei; Liu, Yajun; Baktur, Reyhan

doi:10.1002/mop.32544

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…The morphology of the CNW film deposited on the SAW electrode is shown in Figure 3a. It is a typical top-view morphology of CNWs (lamellar network) and is similar to the morphology of CNWs usually obtained before for a temperature of 700 °C at the same Ar/H2/C2H2 ratio [16]. The H2 plasma treatment modifies the morphology, as we can see in Figure 3b, while surface chemistry is also changed, as we will see below.…”

Section: Resultssupporting

confidence: 82%

“…Carbon-based nanostructured materials represent one of the most studied categories of materials for sensor applications. Carbon nanotubes, carbon nanoparticles and graphenebased nanostructures are materials that have been used as a sensitive element for sensors for different types of gases [16,17]. However, in order to obtain the best possible detection limits, they were frequently used with other materials such as different polymers and different oxides, or they were used at a certain temperature to ensure sensitivity [18,19].…”

Section: Introductionmentioning

confidence: 99%

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High-Sensitivity H2 and CH4 SAW Sensors with Carbon Nanowalls and Improvement in Their Performance after Plasma Treatment

Vizireanu,

Constantinoiu,

Satulu

et al. 2023

Chemosensors

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We have developed surface acoustic wave (SAW) sensors with high sensitivity and a reversible response at room temperature (RT). The sensitive area of the sensor was prepared from vertically aligned graphene sheets, like carbon nanowalls (CNWs), which were deposited onto the quartz SAW sensor substrate. The CNWs were obtained by RF plasma-enhanced chemical vapor deposition (PECVD) at 600 °C, and their sensitivity was subsequently enhanced through hydrogen plasma treatment. The SAW sensors were tested at H2 and CH4 at RT, and they exhibited a reversible response for both gases at concentrations between 0.02% and 0.1%, with a detection limit of a few ppm. The additional hydrogen plasma treatment preserved the lamellar structure, with slight modifications to the morphology of CNW edges, as observed by scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) investigations revealed the presence of new functional groups, a significant number of defects and electron transitions after the treatment. Changes in the chemical state on the CNW surface are most probably responsible for the improved gas adsorption after plasma treatment. These results identify CNWs as a promising material for designing new SAW sensors, with the possibility of using plasma treatments to enhance the detection limit below the ppm level.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

High-Sensitivity H2 and CH4 SAW Sensors with Carbon Nanowalls and Improvement in Their Performance after Plasma Treatment

Vizireanu,

Constantinoiu,

Satulu

et al. 2023

Chemosensors

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“…The monitoring of human physiological signals requires sensors with high sensitivity and stability. So far, metal oxides, , polymers, , carbon-based nanomaterials, , natural nanomaterials, , and other humidity sensors have been widely used. However, the humidity sensors are still facing the problems of slow response time, low detection resolution, large device size, and complex structure.…”

Section: Introductionmentioning

confidence: 99%

A Highly Responsive Graphene Oxide Humidity Sensor Based on PVA Nanofibers

Cui,

Wang,

Liu

et al. 2024

Langmuir

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Graphene oxide (GO) humidity sensors based on poly(vinyl alcohol) (PVA) nanofibers have been proposed. The PVA nanofiber layers of different densities were obtained by adjusting the electrospinning time. Then, GO films were deposited on PVA nanofibers by a spin-coating method. The electrical properties of GO films are improved due to the increased distribution of PVA nanofibers in the GO films. The humidity sensors exhibit good sensitivity under a high relative humidity range of 40−80%. The response of sensors has reached 98.44% at a humidity level of 80% RH. The GO/PVA sensors have good stability at various humidity levels for 1 week. Furthermore, the GO/PVA sensors were used for respiration monitoring under different statuses. These sensors have good application prospects in the respiratory detection and analysis of diseases.

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“…Some materials and measurement types of humidity nanosensor technologies have been researched in the literature; materials including ceramic [ 6 , 7 , 8 , 9 , 10 ], polymer [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ], semiconductor [ 18 , 19 , 20 , 21 , 22 ], carbon-based [ 23 , 24 , 25 , 26 , 27 , 28 ], and MXene material [ 29 , 30 ] are shown in Figure 2 . Generally, the semiconductor and carbon-based humidity sensor can achieve higher sensor response, accompanied by a complex fabrication procedure and longer process time.…”

Section: Introductionmentioning

confidence: 99%

Advances in Humidity Nanosensors and Their Application: Review

Chung

2023

Sensors

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As the technology revolution and industrialization have flourished in the last few decades, the development of humidity nanosensors has become more important for the detection and control of humidity in the industry production line, food preservation, chemistry, agriculture and environmental monitoring. The new nanostructured materials and fabrication in nanosensors are linked to better sensor performance, especially for superior humidity sensing, following the intensive research into the design and synthesis of nanomaterials in the last few years. Various nanomaterials, such as ceramics, polymers, semiconductor and sulfide, carbon-based, triboelectrical nanogenerator (TENG), and MXene, have been studied for their potential ability to sense humidity with structures of nanowires, nanotubes, nanopores, and monolayers. These nanosensors have been synthesized via a wide range of processes, including solution synthesis, anodization, physical vapor deposition (PVD), or chemical vapor deposition (CVD). The sensing mechanism, process improvement and nanostructure modulation of different types of materials are mostly inexhaustible, but they are all inseparable from the goals of the effective response, high sensitivity and low response–recovery time of humidity sensors. In this review, we focus on the sensing mechanism of direct and indirect sensing, various fabrication methods, nanomaterial geometry and recent advances in humidity nanosensors. Various types of capacitive, resistive and optical humidity nanosensors are introduced, alongside illustration of the properties and nanostructures of various materials. The similarities and differences of the humidity-sensitive mechanisms of different types of materials are summarized. Applications such as IoT, and the environmental and human-body monitoring of nanosensors are the development trends for futures advancements.

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Carbon‐nanotube‐loaded planar gas and humidity sensor

Cited by 6 publications

References 17 publications

High-Sensitivity H2 and CH4 SAW Sensors with Carbon Nanowalls and Improvement in Their Performance after Plasma Treatment

High-Sensitivity H2 and CH4 SAW Sensors with Carbon Nanowalls and Improvement in Their Performance after Plasma Treatment

A Highly Responsive Graphene Oxide Humidity Sensor Based on PVA Nanofibers

Advances in Humidity Nanosensors and Their Application: Review

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