Detection of Volatile Organic Compounds Using Microwave Sensors

Zarifi, Mohammad H.; Sohrabi, Amirreza; Shaibani, Parmiss Mojir; Daneshmand, Mojgan; Thundat, Thomas

doi:10.1109/jsen.2014.2345477

Cited by 86 publications

(40 citation statements)

References 27 publications

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“…Gas sensing experiments based on other microwave structures have been reported, mainly with microwave resonator [8][9][10][11][12][13], metamaterial-based resonator [9][10], coupler [15] or patch antenna [16]. Recent publications on microwave-based gas sensors are briefly summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Microwave gas sensing with a microstrip interDigital capacitor: Detection of NH3 with TiO2 nanoparticles

Bailly

Harrabi

Rossignol

et al. 2016

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Microwave gas sensing with a microstrip interDigital capacitor: Detection of NH3 with TiO2 nanoparticles

Bailly

Harrabi

Rossignol

et al. 2016

Sensors and Actuators B: Chemical

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“…Both the real and imaginary parts of the electrical permittivity (and therefore the complex conductivity) of the material in the coupling gap can be extracted by measuring two of the following parameters of a microwave signal: amplitude, frequency, and quality factor. 18 These parameters are simply extractable from S-parameters of the microwave resonator. Planar resonators do not require The Journal of Physical Chemistry C Article circulators or resonant cavities, and very little customization is needed to measure different types of materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Time-Resolved Microwave Photoconductivity (TRMC) Using Planar Microwave Resonators: Application to the Study of Long-Lived Charge Pairs in Photoexcited Titania Nanotube Arrays

et al. 2015

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Steady-state (SRMC) and time-resolved microwave photoconductivity (TRMC) are key techniques used to perform the contact-less determination of carrier density, transport, trapping, and recombination parameters in charge transport materials such as organic semiconductors and dyes, inorganic semiconductors, and metal−insulator composites, which find use in conductive inks, thin film transistors, lightemitting diodes, photocatalysts, and photovoltaics. We present the theory, design, simulation, and fabrication of a planar microwave ring resonator operating at 5.25 GHz with a quality factor of 224, to perform SRMC and TRMC measurements. Our method consists of measuring the resonance frequency (f 0 ) and Q-factor of the microwave resonator with the sample to be probed placed in a defined sensitive region of the resonator where the microwave field is highly concentrated. We also provide proof of concept measurements of the time-resolved microwave photoresponse of anatase-phase TiO 2 nanotube array membranes (TNTAMs) using the planar microstrip resonator. An unusual observation was the persistence of charged pair states in TNTAMs for several hours at room temperature under ambient conditions. Fast (120−220 s), slow (1300−2850 s), and very slow (6−26 h) components were extracted from the long-lived photoconductive decays of TNTAMs in response to 365, 250, and 405 nm illumination and assigned to various trap-mediated processes in TiO 2 nanotubes.

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“…Microwave split-ring resonators have recently gathered a lot of attention because of their potential applications in sensing [1][2][3][4][5][6][7][8][9][10][11]. These microwave devices have a planar structure and can be fabricated using a simple process.…”

Section: Introductionmentioning

confidence: 99%