The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study

Chappanda, Karumbaiah N.; Shekhah, Osama; Yassine, Omar; Patole, Shashikant P.; Eddaoudi, Mohamed; Salama, Khaled N.

doi:10.1016/j.snb.2017.10.189

Cited by 130 publications

(80 citation statements)

References 64 publications

(119 reference statements)

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“…The calculated adsorption τResponse and recovery τRecovery time constants are 5.2 min, 12.8 min, respectively. These are higher than those reported in the literature, for example [43,[53][54][55]. Although the time constants are governed by the nature of the surface coating, the current experimental setup limits our ability to accurately measure these parameters due to the long time required to fully humidify and dehumidify the chamber.…”

Section: Sensitivitymentioning

confidence: 77%

Multimode excitation of a metal organics frameworks coated microbeam for smart gas sensing and actuation

Jaber

Ilyas

Shekhah

et al. 2018

Sensors and Actuators A: Physical

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Highlights The purpose of this study to demonstrate a smart sensor that is capable of performing simultaneous sensing and actuation using a single device which reduce the device size, power requirement, and cost. The concept is based on tracking the frequency shift due to external physical stimuli in the first and third modes of vibration of an electrostatically actuated clamped-clamped microbeam. The microbeam is uniformly functionalized with metal organic frameworks (MOFs) to enhance the sensitivity and selectivity of the proposed sensor. Optimizing the resonator design to excite higher order modes will open the door for simultaneously measuring multiple physical stimuli using a single resonator, which leads to smarter generation of sensors. ABSTRACTSmart sensing systems suffer complexity requiring interface circuits, microcontrollers, switches, and actuators to detect and sense, process the signal and take a decision, and trigger an action upon demand. This increases the device footprint and boosts significantly the power required to actuate the system. Here, we present a hybrid sensor and switch device, which is capable of accurately measuring gas concentration and perform switching when the concentration exceeds specific (safe)

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Section: Sensitivitymentioning

confidence: 77%

Multimode excitation of a metal organics frameworks coated microbeam for smart gas sensing and actuation

Jaber

Ilyas

Shekhah

et al. 2018

Sensors and Actuators A: Physical

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“…[56,57] In the field of classical electronic applications, such composites have been tested as supercapacitors [58,59] or as electrode materials in batteries. [60][61][62][63][64] Furthermore, they can be used as electrocatalyst for water splitting [65] or as sensing materials for humidity [66] or glucose. [67] In resistive sensors, where the state of the MOF (i. e., guest-free or loaded) is expected to directly influence the electrical properties of the composite, homogeneous materials with strong interactions between the components are called for.…”

Section: Introductionmentioning

confidence: 99%

Electrically Conducting Nanocomposites of Carbon Nanotubes and Metal‐Organic Frameworks with Strong Interactions between the two Components

et al. 2019

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Highly integrated nanocomposites of Zr‐based metal‐organic frameworks (MOFs) of the UiO‐66 class and multi‐wall carbon nanotubes (MWCNTs) are prepared by direct crystallization of MOFs in the presence of CNTs. Powder samples with homogeneously distributed and strongly intergrown nanotubes and nanoparticles are obtained. Growth of the MOFs in the presence of CNTs deposited on glass slides yields open or compact coatings of the nanocomposites. The materials combine the high porosity and versatility of MOFs with the high electrical conductivities of CNTs. Upon increasing the amount of CNTs in the synthesis, the electrical conductivity shows a clear percolation behavior. Even with small amounts of CNTs, high conductivities are observed. SEM and TEM pictures show the strong intergrowth between the CNTs and the MOF nanoparticles. Crystallization times are shorter in the presence of CNTs, and CNTs run centrally through the MOF crystals. These facts indicate that the CNTs serve as heterogeneous nucleation centers for the formation of MOF nanocrystals. Sensing experiments performed on the coatings show significant changes in the electrical conductivities of the nanocomposite materials in the presence of different analytes, which are also discernable from the changes observed on bare CNTs. This is further proof for the close interaction between the components of the nanocomposites.

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“…Resistance‐based humidity sensors operate through the detection of environmental fluctuations of vapor counts, which directly affect electrical impedance of the active sensing layer . For instance, increasing humidity level will often cause intensify the electrical conductivity of the sensing film, while simultaneously drops the resistivity of the system.…”

Section: Introductionmentioning

confidence: 99%

Organic Thin‐Film Capacitive and Resistive Humidity Sensors: A Focus Review

Najeeb

Ahmad

Shakoor

2018

Adv Materials Inter

157

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In this paper, organic‐based capacitive and resistive humidity sensors, starting from the fundamental working principles, designs, and characterization, are reviewed. The prevalent adoptions of recent technology in the fabrication of the organic humidity sensors are also discussed. This paper is envisioned to serve as a complete reference guide for researchers who are looking forward to developing a more reliable, economical, and effective humidity sensor using organic/polymeric materials.

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The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study

Cited by 130 publications

References 64 publications

Multimode excitation of a metal organics frameworks coated microbeam for smart gas sensing and actuation

Multimode excitation of a metal organics frameworks coated microbeam for smart gas sensing and actuation

Electrically Conducting Nanocomposites of Carbon Nanotubes and Metal‐Organic Frameworks with Strong Interactions between the two Components

Organic Thin‐Film Capacitive and Resistive Humidity Sensors: A Focus Review

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