A nafion coated capacitive humidity sensor on a flexible PET substrate

Sapsanis, Christos; Büttner, U.; Omran, Hesham; Belmabkhout, Youssef; Shekhah, Osama; Eddaoudi, Mohamed; Salama, Khaled N.

doi:10.1109/mwscas.2016.7870020

Cited by 18 publications

(8 citation statements)

References 24 publications

(31 reference statements)

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“…At 100 kHz and above, there were negligible reductions in the sensitivity of the device. The increase in sensitivity is because a lower drive frequency provides a longer time for the polarization of the adsorbed acetone [ 81 ]. However, at lower frequencies, the response is relatively noisier because of the larger drift and fluctuation in the output response of the sensor, affecting the LOD as well as the short- and long-term stability of the sensor.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

Chappanda

Tchalala

Shekhah

et al. 2018

Sensors

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We present a comparative study of two types of sensor with different transduction techniques but coated with the same sensing material to determine the effect of the transduction mechanism on the sensing performance of sensing a target analyte. For this purpose, interdigitated electrode (IDE)-based capacitors and quartz crystal microbalance (QCM)-based resonators were coated with a zeolitic–imidazolate framework (ZIF-8) metal–organic framework thin films as the sensing material and applied to the sensing of the volatile organic compound acetone. Cyclic immersion in methanolic precursor solutions technique was used for depositing the ZIF-8 thin films. The sensors were exposed to various acetone concentrations ranging from 5.3 to 26.5 vol % in N2 and characterized/compared for their sensitivity, hysteresis, long-term and short-term stability, selectivity, detection limit, and effect of temperature. Furthermore, the IDE substrates were used for resistive transduction and compared using capacitive transduction.

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Section: Resultsmentioning

confidence: 99%

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

Chappanda

Tchalala

Shekhah

et al. 2018

Sensors

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“…Moreover, extreme conditions of humidity have adverse effects on human health and are linked to many diseases . Different types of humidity sensors have been developed based on either solid-state devices, ,− flexible substrates, − inkjet printed textile, or textile fiber composite materials. ,− Most of these studies demonstrated the sensitivity of the sensor; however, only a few of these discussed the selectivity of the sensor, which is equally important. Moreover, in the case of textile-based humidity sensors, to the best of our knowledge, there is no report describing the selectivity of the textile sensors in the presence of interferences such as volatile organic compounds (VOCs).…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Metal–Organic Framework Textile Humidity Sensor

Rauf

Vijjapu

Andrés

et al. 2020

ACS Appl. Mater. Interfaces

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The increase in demand and popularity of smart textiles brings new and innovative ideas to develop a diverse range of textile-based devices for our daily life applications. Smart textile-based sensors (TEX sensors) become attractive due to the potential to replace current solid-state sensor devices with flexible and wearable devices. We have developed a smart textile sensor for humidity detection using a metal–organic framework (MOF) as an active thin-film layer. We show for the first time the use of the Langmuir–Blodgett (LB) technique for the deposition of a MIL-96(Al) MOF thin film directly onto the fabrics containing interdigitated textile electrodes for the fabrication of a highly selective humidity sensor. The humidity sensors were made from two different types of textiles, namely, linen and cotton, with the linen-based sensor giving the best response due to better coverage of MOF. The TEX sensor showed a reproducible response after multiple cycles of measurements. After 3 weeks of storage, the sensor showed a moderate decrease in response. Moreover, TEX sensors showed a high level of selectivity for the detection of water vapors in the presence of several volatile organic compounds (VOCs). Interestingly, the selectivity is superior to some of the previously reported MOF-coated solid-state interdigitated electrode devices and textile sensors. The method herein described is generic and can be extended to other textiles and coating materials for the detection of toxic gases and vapors.

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“…On the other hand, PET has a high humidity resistance, therefore, it is generally more used in applications where the device is exposed to a high humidity environments. [62]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Flexible Photodetector Based on 2D Materials: Processing, Architectures, and Applications

Dong

Simões

Yang

2020

Adv Materials Inter

148

111

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Flexible photodetectors have emerged during the past few years for applications in healthcare, security, and environmental monitoring. Recently, 2D materials have started being implemented as functional layers in flexible photodetector due to their outstanding optoelectronic characteristics paired with high mechanical flexibility. In this work, the authors analyze the progress of 2D material‐based flexible photodetectors architectures, with a focus on graphene family, (Di)chalcogenides and van der Waals heterostructures. The optical and mechanical characteristics of 2D materials flexible photodetectors are systematically analyzed. Furthermore, the processing techniques compatible with flexible substrates and proof‐of‐concept sensors integrating 2D material flexible photodetectors are also reviewed. In the last section, the remaining challenges and future perspectives are discussed, envisioning to support future developments in the field.

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A nafion coated capacitive humidity sensor on a flexible PET substrate

Cited by 18 publications

References 24 publications

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

Highly Selective Metal–Organic Framework Textile Humidity Sensor

Flexible Photodetector Based on 2D Materials: Processing, Architectures, and Applications

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