Sensitivity enhancement in planar microwave active-resonator using metal organic framework for CO2 detection

Zarifi, Mohammad H.; Gholidoust, Abedeh; Abdolrazzaghi, Mohammad; Shariaty, Pooya; Hashisho, Zaher

doi:10.1016/j.snb.2017.08.169

Cited by 72 publications

(25 citation statements)

References 62 publications

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“…The evolution of gas adsorption in zeolite and the permittivity change are shown in Figure 5. Besides the physical adsorption, the coordinatively unsaturated metal sites in the zeolite are also sites for gas adsorption by the electrostatic process (Zarifi et al, 2018). Therefore, more unsaturated metal sites in the sensitive material induce higher adsorption capacity, and this demonstrated a larger sensitive response.…”

Section: Zeolitesmentioning

confidence: 99%

“…(a) Experimental setup with the microwave active resonator sensor, (b) resonant profile (S21) of the sensor based on the active resonator, (c) photograph of the fabricated six-port reflectometer, (d) resonant profile S11 of the sensor based on the six-port reflectometer. Reproduced with permissions fromStaszek et al (2017) andZarifi et al (2018). Copyright 2017, 2018 Elsevier.…”

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confidence: 99%

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Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Zheng

Hua

et al. 2019

Front. Mater.

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Microwave transduction is a novel research field in gas sensing owing to its simplicity, low cost, passive, and non-contact operations that indicate a huge potential in applications for gas sensing. At present, the study of microwave gas sensors is limited to testing the macroscopic performance of materials. Although the permittivity change of materials is the reason for microwave transduction, the knowledge of the fundamental mechanism is an urgent requirement for boosting the development of microwave gas sensors. In this review, we summarized the presented progresses of microwave gas sensors, including the performance of the different materials and propagative structures, as well as their sensitive signal. We have attempted to explain the sensitive mechanism of these materials, discuss the function of the propagative structure, and analyze the sensitive signal extracted from the parameters of electromagnetic waves. Finally, the challenges in the study of sensitive materials and propagative structures used in microwave gas sensors are analyzed. It is clear from the published literatures that microwave transduction provide a new route for gas detection, and it is expected that commercial manifestation will occur. The future research on microwave gas sensors will continue to exploit their sensitive materials and propagative structure for different applications. The understanding of the microscopic polarization interactions with gases will assist in and guide the fabrication of high-performance microwave gas sensors in the future.

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Section: Zeolitesmentioning

confidence: 99%

mentioning

confidence: 99%

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Zheng

Hua

et al. 2019

Front. Mater.

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“…Recently, most of the study measurements [12][13][14][15] are based on the resonant technique as the measurement principle is simple, in which the properties of the sample under test are characterized from the measurements of shifting resonance frequency and quality of factor Q. Although this method provides accurate measurements, it requires high resolution and frequency sweep instruments, as well as good environmental control measure.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Moisture Content for Various Kind of Tea Leaves in Drying Processes Using RF Reflectometer-Sensor System

et al. 2018

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This paper presents tea leaves moisture monitoring system based on RF reflectometry techniques. The system was divided into two parts which are the sensor and reflectometer parts. The large coaxial probe was used as a sensor for the system. The reflectometer part plays a role as signal generator and also data acquisition. The reflectometer-sensor system was operated with a graphical user interface at 1.529 GHz at room temperature. The system was able to measure the moisture content of tea leaves ranging 0% m.c to 50% m.c on a wet basis. In this study, up to five kinds of tea leaves bulk were tested. The mean of absolute errors in the moisture measurement for tea leaves was ±2.

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“…Microwave techniques have been used to measure and monitor changes in the electromagnetic properties of materials [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Microwave measurements can be very sensitive and can be used remotely through many different media to non-invasively monitor the sensing material’s response to its environment.…”

Section: Introductionmentioning

confidence: 99%

Remote Microwave and Field-Effect Sensing Techniques for Monitoring Hydrogel Sensor Response

et al. 2018

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This paper presents two novel techniques for monitoring the response of smart hydrogels composed of synthetic organic materials that can be engineered to respond (swell or shrink, change conductivity and optical properties) to specific chemicals, biomolecules or external stimuli. The first technique uses microwaves both in contact and remote monitoring of the hydrogel as it responds to chemicals. This method is of great interest because it can be used to non-invasively monitor the response of subcutaneously implanted hydrogels to blood chemicals such as oxygen and glucose. The second technique uses a metal-oxide-hydrogel field-effect transistor (MOHFET) and its associated current-voltage characteristics to monitor the hydrogel’s response to different chemicals. MOHFET can be easily integrated with on-board telemetry electronics for applications in implantable biosensors or it can be used as a transistor in an oscillator circuit where the oscillation frequency of the circuit depends on the analyte concentration.

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Sensitivity enhancement in planar microwave active-resonator using metal organic framework for CO2 detection

Cited by 72 publications

References 62 publications

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Monitoring Moisture Content for Various Kind of Tea Leaves in Drying Processes Using RF Reflectometer-Sensor System

Remote Microwave and Field-Effect Sensing Techniques for Monitoring Hydrogel Sensor Response

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