Design and investigation of thin film nanocomposite electrodes for electrochemical sensors

Медведева, Е. А.; Baranov, Alexander; Somov, Andrey

doi:10.1016/j.snb.2016.02.104

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…The porous PTFE has a large surface area, which makes it attractive for various flexible gas and humidity sensors. The hydrophobic porous PTFE has recently been utilized as the flexible substrate for gas sensors [ 3 , 4 , 5 ], in which hydrophobic and porous properties of the PTFE greatly enhance gas diffusion, leading to high sensitivity and fast response. As the substrate of humidity sensors, the hydrophobicity of PTFE surface improves the performance of the sensor, whereas it also causes the poor adhesiveness with metal and difficulty of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Flexible Capacitive Humidity Sensors Based on Graphene Oxide on Porous PTFE Substrates

Wei

Huang

Chen

et al. 2021

Sensors

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Porous polytetrafluoroethylene (PTFE) is physically flexible, thermally and chemically stable, relatively inexpensive, and commercially available. It is attractive for various flexible sensors. This paper has studied flexible capacitive humidity sensors fabricated on porous PTFE substrates. Graphene oxide (GO) was used as a sensing material, both hydrophobic and hydrophilic porous PTFE as the substrates, and interdigitated electrodes on the PTFE substrates were screen-printed. SEM and Raman spectrum were utilized to characterize GO and PTFE. An ethanol soak process is developed to increase the yield of the humidity sensors based on hydrophobic porous PTFE substrates. Static and dynamic properties of these sensors are tested and analyzed. It demonstrates that the flexible capacitive humidity sensors fabricated on the ethanol-treated hydrophobic PTFE exhibit high sensitivity, small hysteresis, and fast response/recovery time.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Flexible Capacitive Humidity Sensors Based on Graphene Oxide on Porous PTFE Substrates

Wei

Huang

Chen

et al. 2021

Sensors

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“…Sensors are devices that provides an output signal usable in response to a specific measure, such as observable chemical reactions between certain materials [6]. A gas sensor can be used to monitor potentially dangerous leaks and, if connected to an automatic control system, can be an advantage in detecting high concentrations of gas in a given environment [7,8].…”

Section: Introduction *mentioning

confidence: 99%

Graphene Based Sensors for Air Quality Monitoring - Preliminary Development Evaluation

Machado¹,

Hortigüela²,

Otero‐Irurueta³

et al. 2019

J. Coat. Sci. Technol.

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Indoor air pollution can induce adverse health effects on building occupants and pose a significant role in health worldwide. To avoid such effects, it is extremely important to monitor and control common indoor pollutants such as CO2, VOCs and relative humidity. Therefore, this work focuses on recent advances in the field of graphene-based gas sensors, emphasizing the use of modified graphene that broadly expands the range of nanomaterials sensors. Graphene films were grown on copper by chemical vapor deposition (CVD) and transferred to arbitrary substrates. After synthesis, the samples were functionalized with Al2O3 by ALD and characterized by a large set of experimental techniques such as XPS, Raman and SEM. The results demonstrated that graphene was successfully synthesized and transferred to SiO2, glass and polymer. As a proof-of-concept, ALD of Al2O3 was performed on the graphene surface to produce a graphene/metal oxide nanostructure towards the development of nanocomposites for gas sensing. From this perspective, a laboratory prototype device based in measuring the electrical properties of the graphene sample as a function of the gas absorption is under development.

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“…Generally, different gases are detected by detecting change in electrical properties such as conductivity, resistivity of array chips, which changes due to change in chemical composition of sensing array with different gases. 6 With increase in market different kinds of e-nose based sensors like electrochemical sensors, 7 optical sensors, 8 metal-oxide semiconductor sensors, 9 surface acoustic-wave sensors 10 and polymer-based resistive gas sensors 11 were developed and work on advancement of these sensors using internet of things (IOT), machine learning (ML) 12 and artificial neural networks (ANN) 13 is going on to make it more fast and reliable. To meet requirement of this generation and competitive market, there is need to develop high efficient-low cost multi-tasking wearable sensors.…”

mentioning

confidence: 99%

Printed Resistive Sensor Array Combined with a Flexible Substrate for Ethanol and Methane Detection

Wei

Kumar

Yao

2020

ECS J. Solid State Sci. Technol.

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In this research, we combined printed electrodes and a flexible substrate to develop a low-cost, resistive, gas sensor with small energy consumption. The ability to measure a gas is derived from an analysis of the resistance change resulting from gas molecules adsorbed by a polymer. With the sensor array coated with various polymers, we can identify the gas type and its concentration. Eight combinations of electrode with different width and gap were designed. The electrodes were printed on PET substrates with silver ink. Sensing material developed with mixture of Polyvinylpyrrolidone (PNVP), Carbon Black (CB) and solvent ethylene glycol (EG) was then coated on the sensors and tested with ethanol and methane. The layout design of the width and gap with the greatest sensitivity towards gases is 20 μm/20 μm. The limit of detection (LOD) is 40 ppm for ethanol and 36 ppm for methane; the resistance changes of the two gases are apparently opposite. Besides this, sensors coated with other sensing materials developed with combination of CB,polymers, poly(4-vinylpyridine)(P4VP) and polystyrene (PS) with solvent, EG and Tetrahydofuran (THF) respectively were measured with gases at varied concentration to derive the sensitivity of each. According to these experiments, a flexible gas sensor shows a great potential to achieve the purpose of establishing a wearable sensing platform.

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Design and investigation of thin film nanocomposite electrodes for electrochemical sensors

Cited by 10 publications

References 24 publications

Fabrication and Characterization of Flexible Capacitive Humidity Sensors Based on Graphene Oxide on Porous PTFE Substrates

Fabrication and Characterization of Flexible Capacitive Humidity Sensors Based on Graphene Oxide on Porous PTFE Substrates

Graphene Based Sensors for Air Quality Monitoring - Preliminary Development Evaluation

Printed Resistive Sensor Array Combined with a Flexible Substrate for Ethanol and Methane Detection

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