Microwave Gas Sensor based on Graphene-loaded Substrate Integrated Waveguide Cavity Resonator

Ali, Md. Liakot; Cheng, Mark Ming Cheng; Chen, Jimmy Ching-Ming; Wu, Chung-Tse Michael

doi:10.1109/mwsym.2016.7540295

Cited by 23 publications

(13 citation statements)

References 13 publications

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“…It is observed that the proposed sensor shows higher sensitivity and smaller electrical size compared with other RF sensors from [16,20,21,49]. In addition, the performance of the proposed RF sensor is compared with the performance of other non-RF sensors from [41,50,51,52,53] in Table 3.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…The structure of the SRR/CSRR can be understood and analyzed by modeling the equivalent LC (inductance and capacitance) and applying the resonance phenomenon. There is a growing trend to realize communication and sensing applications using SRRs and CSRRs owing to their high quality (Q) factor [18,19,20,21,22,23,24,25,26,27,28,29,30]. The CSRR consists of a single ring, etched on the top metallization or in the ground plane with a particular orientation.…”

Section: Introductionmentioning

confidence: 99%

“…Their integration with other structures significantly reduce the size of the overall design offering a simple and low-cost fabrication. Their use for diverse sensing applications such as chemical sensors [19,20], gas sensors [21,31], crack detection sensors [22,23], angle sensors [24], alignment and position sensors [25], displacement sensors [26] and microwave imaging sensors [27] has been already demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Complementary Split-Ring Resonator-Loaded Microfluidic Ethanol Chemical Sensor

Salim

Lim

2016

Sensors

206

115

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In this paper, a complementary split-ring resonator (CSRR)-loaded patch is proposed as a microfluidic ethanol chemical sensor. The primary objective of this chemical sensor is to detect ethanol’s concentration. First, two tightly coupled concentric CSRRs loaded on a patch are realized on a Rogers RT/Duroid 5870 substrate, and then a microfluidic channel engraved on polydimethylsiloxane (PDMS) is integrated for ethanol chemical sensor applications. The resonant frequency of the structure before loading the microfluidic channel is 4.72 GHz. After loading the microfluidic channel, the 550 MHz shift in the resonant frequency is ascribed to the dielectric perturbation phenomenon when the ethanol concentration is varied from 0% to 100%. In order to assess the sensitivity range of our proposed sensor, various concentrations of ethanol are tested and analyzed. Our proposed sensor exhibits repeatability and successfully detects 10% ethanol as verified by the measurement set-up. It has created headway to a miniaturized, non-contact, low-cost, reliable, reusable, and easily fabricated design using extremely small liquid volumes.

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Section: Fabrication and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Complementary Split-Ring Resonator-Loaded Microfluidic Ethanol Chemical Sensor

Salim

Lim

2016

Sensors

206

115

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“…Until now, most previous ammonia sensors using rGO as a part of sensitive materials are focused on resistance or current variation, unable to realize wireless sensing. Recently, some studies have realized wireless sensing using a coil antenna [ 14 ], a substrate integrated waveguide (SIW) slot antenna [ 15 ], and a dipole antenna [ 16 ]. In [ 14 ], a wireless sensing system is proposed using integrated arrays of field-effect transistors, and sensors comprising graphene channels and silver nanowire electrodes, interconnected with a wireless antenna.…”

Section: Introductionmentioning

confidence: 99%

“…This wireless sensing system can only detect harmful gases at a distance of 2 mm. Moreover, in [ 15 ], two SIW-based cavity resonators, a ring-slot resonator and a complementary split ring resonator (CSRR), were fabricated and coated with CVD-grown graphene. Graphene covers the gaps in the radiation energy, so the energy cannot radiate effectively and wireless sensing cannot be realized remotely.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Wireless Ammonia Gas Sensors Based on Reduced Graphene Oxide and Nano-Silver Ink Hybrid Material Loaded on a Patch Antenna

Zhang

Huang

et al. 2017

Sensors

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Reduced graphene oxide (rGO) has been studied as a resistive ammonia gas sensor at room temperature. The sensitive hybrid material composed of rGO and nano-silver ink (Ag-ink) was loaded on a microstrip patch antenna to realize high-performance wireless ammonia sensors. The material was investigated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Firstly, interdigital electrodes (IDEs) printed on the polyethylene terephthalate (PET) by direct printing were employed to measure the variation of resistance of the sensitive material with the ammonia concentration. The results indicated the response of sensor varied from 4.25% to 14.7% under 15–200 ppm ammonia concentrations. Furthermore, the hybrid material was loaded on a microstrip patch antenna fabricated by a conventional printed circuit board (PCB) process, and a 10 MHz frequency shift of the sensor antenna could be observed for 200 ppm ammonia gas. Finally, the wireless sensing property of the sensor antenna was successfully tested using the same emitted antenna outside the gas chamber with a high gain of 5.48 dBi, and an increased reflection magnitude of the emitted antenna due to the frequency mismatch of the sensor antenna was observed. Therefore, wireless ammonia gas sensors loaded on a patch antenna have significant application prospects in the field of Internet of Things (IoTs).

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A compact tri‐band microwave resonator for ethanol gas detection

Alsath

Savarimuthu

Erattaiselvam

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the design, simulation, fabrication, and testing of a compact two‐port microwave resonator coated with nanomaterials for ethanol gas sensing applications. The proposed gas sensor consists of a transmission line loaded with three triangular split ring resonators for ethanol detection at three frequency bands viz. 2.2, 4.6, and 6.3 GHz. The transmission line has all‐pass characteristics in which band gaps are introduced using three split ring resonators. The TiO2 and ZnO nanorods are used as sensitive layers for the proposed sensing application. The nanorods, which are grown on a glass substrate of thickness 1 mm, are loaded on to the two‐port microwave resonator making the device sensitive to ethanol. The microwave behavior of the sensor is analyzed using the scattering parameters. The absorption of the ethanol gas causes frequency detuning which is used to analyze the presence of ethanol and its concentration. From the experiments, it is understood that there is an increase in the frequency shift with an increase in the concentration of ethanol gas. The sensing device with ZnO as a sensitive layer showed a higher average sensitivity of 2.35 compared to TiO2 whose average sensitivity is 1.29.

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Microwave Gas Sensor based on Graphene-loaded Substrate Integrated Waveguide Cavity Resonator

Cited by 23 publications

References 13 publications

Complementary Split-Ring Resonator-Loaded Microfluidic Ethanol Chemical Sensor

Complementary Split-Ring Resonator-Loaded Microfluidic Ethanol Chemical Sensor

High-Performance Wireless Ammonia Gas Sensors Based on Reduced Graphene Oxide and Nano-Silver Ink Hybrid Material Loaded on a Patch Antenna

A compact tri‐band microwave resonator for ethanol gas detection

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