Relevant bibliographies by topics / Moisture sensors selectivity based on porous materials

Academic literature on the topic 'Moisture sensors selectivity based on porous materials'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Moisture sensors selectivity based on porous materials"

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Wang, Yanyan, Ming Yang, Weixiao Liu, Lei Dong, Da Chen, and Changsi Peng. "Gas sensors based on assembled porous graphene multilayer frameworks for DMMP detection." Journal of Materials Chemistry C 7, no. 30 (2019): 9248–56. http://dx.doi.org/10.1039/c9tc02299f.

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In this work, a structure of assembled porous graphene multilayer frameworks was demonstrated to endow the resultant sensing devices with batch uniformity, good response, sensitivity, and selectivity.
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Duong, The, Alishba T. John, Hongjun Chen, Huyen Pham, Krishnan Murugappan, Thanh Tran-Phu, Antonio Tricoli, and Kylie Catchpole. "Mixed-dimensional organic–inorganic metal halide perovskite (OIMHP) based gas sensors with superior stability for NO2 detection." Materials Advances 3, no. 2 (2022): 1263–71. http://dx.doi.org/10.1039/d1ma00976a.

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Mixed-dimensional 2D/3D perovskite-based NO2 gas sensors were developed with swift response, great sensitivity and good selectivity. The 2D/3D devices have significantly better moisture stability than the 3D devices.
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Hu, Ruijin, Jing Wang, Pengpeng Chen, Yuwen Hao, Chunli Zhang, and Xiaogan Li. "Preparation of Cd-Loaded In2O3Hollow Nanofibers by Electrospinning and Improvement of Formaldehyde Sensing Performance." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/431956.

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Pure In2O3and Cd-loaded In2O3hollow and porous nanofibers with different Cd/In molar ratios (1/20, 1/10, 1/1) were synthesized by electrospinning method. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and transmission electron microscopy (TEM) were used to characterize the nanofibers. The porous nanofibers were composed of small grains. The average grain sizes and the diameters of Cd-loaded In2O3nanofibers increased with the increasing of Cd/In molar ratios. The formaldehyde sensing properties of the sensors based on pure In2O3and Cd-loaded In2O3nanofibers were investigated in formaldehyde concentration range of 0.5∼100 ppm. Moreover, the selectivity of those sensors was studied by testing responses to methanol, toluene, ethanol, acetone, and ammonia. The result showed that Cd-loaded In2O3nanofibers with Cd/In molar ratio of 1/10 possessed the highest response value and good selectivity at operating temperature 280°C. In addition, the formaldehyde sensing mechanism of the sensors based on Cd-loaded nanofibers was briefly analyzed.
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Huang, Bo, Yanqiong Li, and Wen Zeng. "Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance." Chemosensors 9, no. 8 (August 14, 2021): 226. http://dx.doi.org/10.3390/chemosensors9080226.

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Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; and polymer gas sensors have poor stability and selectivity, so it is necessary to develop high-performance gas sensors. As a porous material constructed from inorganic nodes and multidentate organic bridging linkers, the metal-organic framework (MOF) shows viable applications in gas sensors due to its inherent large specific surface area and high porosity. Thus, compounding sensor materials with MOFs can create a synergistic effect. Many studies have been conducted on composite MOFs with three materials to control the synergistic effects to improve gas sensing performance. Therefore, this review summarizes the application of MOFs in sensor materials and emphasizes the synthesis progress of MOF composites. The challenges and development prospects of MOF-based composites are also discussed.
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Sun, Peng. "Gas Sensors Based on Oxide Semiconductors with Porous Nanostructures." Proceedings 14, no. 1 (June 19, 2019): 13. http://dx.doi.org/10.3390/proceedings2019014013.

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Gas sensor as a device composed of sensing material coupled with signal transducer, has been acknowledged as an analytical tool for detection and quantification of inflammable, explosive or toxic gases. The gas sensors based on nanostructured oxide semiconductor endowed with excellent sensing properties have exhibited great potential application in the fields of environmental monitoring, resource exploration, medical welfare, etc. It is well known that the sensing mechanism of sensor employing oxide semiconductors is mainly that the interactions between the surface adsorbed oxygen species and target gases lead to a change in the electrical conductivity. Therefore, the gas sensing properties of oxide semiconductors are closely related with their composition, crystalline size, and microstructure. In this regard, design and preparation of oxides with novel architectures will be increasingly important in the construction of high performance gas sensors. Due to high specific surface area, low density, and good surface permeability, porous nanostructures oxide semiconductor sensing materials have attracted growing interest in recent years. In our work, we successfully prepared various porous nanostructures oxides and their composites to the construction of high performances gas sensors with enhanced sensitivity, selectivity, as well as lowered detection limit. The subsequent gas sensing measurements explicitly revealed that these oxides and composites manifested superior sensing behaviors (like much higher sensitivity and faster response speed), which can be ascribed to the porous architectures and the synergistic effects.
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S, Anil Subash, Manjunatha C, Ajit Khosla, R. Hari Krishna, and Ashoka S. "Current Progress in Materials, Device Fabrication, and Biomedical Applications of Potentiometric Sensor Devices: A Short Review." ECS Transactions 107, no. 1 (April 24, 2022): 6343–54. http://dx.doi.org/10.1149/10701.6343ecst.

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Potentiometric sensor devices are having a wide range of applications in environmental and biomedical fields. This short review aims to provide updates on recent innovations in various nanomaterials as sensing components used in potentiometric sensor devices. The review also covers the various methods and conditions used to develop these sensor nanomaterials with appropriately decorated by functional groups. Reduced graphene oxide along with traditional platinum electrodes is used to monitor algae growth in an aquatic ecosystem. Here, the addition of reduced-graphene increases the selectivity and precision of the potentiometric sensor. The review also describe the fabrication and the mechanism of sensing of carbon composite based glucose sensors, sweat sensors, and pH sensors, which are used for monitoring a human body. Sweat sensors are the ion-sensors which use carbon nanoparticles for high selectivity. Porous graphene oxide is also one of the highly used carbon nanomaterials which show high selectivity towards different types of chemicals under certain conditions. PANI/Graphene/CNT nanocomposite based potentiometric sensor is used to detect hazardous 4-aminophenol in the surrounding area. Using nanocomposite increases the selectivity and gives a high current response in the I-V graph. The granular nature of InVO4 is used in the fabrication of ammonia sensors. Formaldehyde is one of the commonly found adulterations in the food. A biosensor has been fabricated using CNTs-Fe3O4 nanocomposite to detect the formaldehyde in the foods. Finally the review summarizes the merits and limitations of various potentiometric sensors developed for different biomedical applications.
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Do, Jing Shan, Wen Long Liu, Ming Liao Tsai, and Sheng Yeng Kuo. "Preparation and Selectivity of Resistive Acetone Gas Sensors Based on Polyaniline/Au Interdigitated Electrode." Key Engineering Materials 605 (April 2014): 202–6. http://dx.doi.org/10.4028/www.scientific.net/kem.605.202.

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The acetone gas sensor can be applied in the fields of the occupational safety, the prevention of fire accident and explosion in plants and the diabetic patients breathe analysis. The properties of the sensing materials and the sensing characteristics of the acetone gas sensors based on polyaniline (PANI)/Au/porous ceramic plate prepared by the microfabrication technologies and the electrochemical methods are studied in this work. PANI with stable sensing performance is prepared by a three-stage chronopotentiometric method onto Au/porous ceramic plate. The PANI nanowires are uniformly distributed on Au interdigitated electrode surface characterized by field emission scanning electron microscopy (FESEM).The sensitivity and the response time of the resistive acetone gas sensor are obtained to be 4.0×10-3% ppm-1and 3 min when using N2as carrier gas. Based on the same sensing electrode, the sensitivities of the gas sensor to mixed gas containing acetone are measured.Key words: gas sensor; acetone; polyaniline; sensitivity; selectivity
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Li, Dengke, Yanwei Li, Xiaohua Wang, Guang Sun, Jianliang Cao, and Yan Wang. "Improved TEA Sensitivity and Selectivity of In2O3 Porous Nanospheres by Modification with Ag Nanoparticles." Nanomaterials 12, no. 9 (May 2, 2022): 1532. http://dx.doi.org/10.3390/nano12091532.

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A highly sensitive and selective detection of volatile organic compounds (VOCs) by using gas sensors based on metal oxide semiconductor (MOS) has attracted increasing interest, but still remains a challenge in gas sensitivity and selectivity. In order to improve the sensitivity and selectivity of In2O3 to triethylamine (TEA), herein, a silver (Ag)-modification strategy is proposed. Ag nanoparticles with a size around 25–30 nm were modified on pre-synthesized In2O3 PNSs via a simple room-temperature chemical reduction method by using NaBH4 as a reductant. The results of gas sensing tests indicate that after functionalization with Ag, the gas sensing performance of In2O3 PNSs for VOCs, especially for TEA, was remarkably improved. At a lower optimal working temperature (OWT) of 300 °C (bare In2O3 sensor: 320 °C), the best Ag/In2O3-2 sensor (Ag/In2O3 PNSs with an optimized Ag content of 2.90 wt%) shows a sensitivity of 116.86/ppm to 1–50 ppm TEA, about 170 times higher than that of bare In2O3 sensor (0.69/ppm). Significantly, the Ag/In2O3-2 sensor can provide a response (Ra/Rg) as high as 5697 to 50 ppm TEA, which is superior to most previous TEA sensors. Besides lower OWT and higher sensitivity, the Ag/In2O3-2 sensor also shows a remarkably improved selectivity to TEA, whose selectivity coefficient (STEA/Sethanol) is as high as 5.30, about 3.3 times higher than that of bare In2O3 (1.59). The sensitization mechanism of Ag on In2O3 is discussed in detail.
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Strangfeld, Christoph, Sergej Johann, and Matthias Bartholmai. "Smart RFID Sensors Embedded in Building Structures for Early Damage Detection and Long-Term Monitoring." Sensors 19, no. 24 (December 13, 2019): 5514. http://dx.doi.org/10.3390/s19245514.

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In civil engineering, many structures are made of reinforced concrete. Most degradation processes relevant to this material, e.g., corrosion, are related to an increased level of material moisture. Therefore, moisture monitoring in reinforced concrete is regarded as a crucial method for structural health monitoring. In this study, passive radio frequency identification (RFID)-based sensors are embedded into the concrete. They are well suited for long-term operation over decades and are well protected against harsh environmental conditions. The energy supply and the data transfer of the humidity sensors are provided by RFID. The sensor casing materials are optimised to withstand the high alkaline environment in concrete, having pH values of more than 12. Membrane materials are also investigated to identify materials capable of enabling water vapour transport from the porous cement matrix to the embedded humidity sensor. By measuring the corresponding relative humidity with embedded passive RFID-based sensors, the cement hydration is monitored for 170 days. Moreover, long-term moisture monitoring is performed for more than 1000 days. The experiments show that embedded passive RFID-based sensors are highly suitable for long-term structural health monitoring in civil engineering.
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Simion, Cristian E., Corneliu Ghica, Catalina G. Mihalcea, Daniela Ghica, Ionel Mercioniu, Simona Somacescu, Ovidiu G. Florea, and Adelina Stanoiu. "Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity." Chemosensors 9, no. 9 (September 1, 2021): 244. http://dx.doi.org/10.3390/chemosensors9090244.

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Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration.
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Dissertations / Theses on the topic "Moisture sensors selectivity based on porous materials"

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Озчелік, Батухан. "Сенсор вологості на основі пористих матеріалів." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/28888.

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Дана дипломна робота містить 99 сторінок загального обсягу, з яких 90 сторінок основного тексту. В структурі роботі міститься 4 таблиці, 24 рисунки, 5 схем, 52 бібліографічні найменування за переліком посилань. Мета дослідження - ознайомиться з характеристиками і властивостями пористих матеріалів і проаналізувати будову сенсора вологості на основі пористих матеріалів. Проведено комплексні дослідження пористих матеріалів як основи для виготовлення сенсорів вологості. Розроблено оптимальну технологічну схему і параметри процесу структурування даного приладу.
This thesis contains 99 pages of the total volume, of which 90 pages of the main text. The structure of the work contains 4 tables, 24 figures, 5 schemes, 52 bibliographic titles in the list of references. The purpose of the study - acquainted with the characteristics and properties of porous materials and analyze the structure of moisture sensor based on porous materials. Complex researches of porous materials as bases for manufacturing sensors of humidity are carried out. The optimal technological scheme and parameters of the structuring process of this device are developed.
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Book chapters on the topic "Moisture sensors selectivity based on porous materials"

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Strangfeld, Christoph, and Tim Klewe. "Hygrometric Moisture Measurements Based on Embedded Sensors to Determine the Mass of Moisture in Porous Building Materials and Layered Structures." In Lecture Notes in Civil Engineering, 213–25. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64594-6_22.

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