CNT-Based Inkjet-Printed RF Gas Sensor: Modification of Substrate Properties during the Fabrication Process

George, Julien; Abdelghani, Aymen; Bahoumina, Prince; Tantot, Olivier; Baillargeat, Dominique; Frigui, Kamel; Bila, Stéphane; Hallil, Hamida; Déjous, Corinne

doi:10.3390/s19081768

Cited by 32 publications

(17 citation statements)

References 28 publications

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“…Many of these traditional DW applications can be enhanced through the integration of wireless communication and, as such, there has also been research combining DW sensors with flexible RFID tags [8,32,33] and WLAN frequency band antennas optimal for IoT devices [34]. Additionally, printed inductors, capacitors, transducers, energy harvesting rectennas, and low loss dielectrics have all been developed specifically for RF applications [35][36][37][38]. Work is also being undertaken to implement these RF components on flexible, foldable, and conformal surfaces [32,[39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Overcoming Variability in Printed RF: A Statistical Method to Designing for Unpredictable Dimensionality

Berry

Brown

Pothier

et al. 2022

Designs

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As additively manufactured radio frequency (RF) design expands towards higher frequencies, performance becomes ever more sensitive to print-induced dimensional variations. These slight deviations from design dimensions typically skew RF performance, resulting in low yields or poor device performance. In order to overcome this limitation, RF design paradigms must be developed for non-uniform process and material-specific variations. Therefore, a new generalized approach is developed to explore variation-tolerant designs for printed RF structures. This method evaluates the feature fidelity and S11 performance of micro-dispensed, X-band (8–12 GHz) patch antennas by evaluating the standard deviation in as-printed features, surface roughness, and thickness. It was found that the traditional designs based on optimal impedance matching values did not result in the most robust performance over multiple printing sessions. Rather, performance bounds determined by print deviation could be utilized to improve large-batch S11 results by up to 7dB. This work demonstrates that establishing the average standard deviation of printed dimensions in any RF printing system and following the formulated design procedure could greatly improve performance over large datasets. As such, the method defined here can be applied to improve large-scale, printed RF yields and enable predictive performance metrics for any given printing method.

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Section: Introductionmentioning

confidence: 99%

Overcoming Variability in Printed RF: A Statistical Method to Designing for Unpredictable Dimensionality

Berry

Brown

Pothier

et al. 2022

Designs

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“…A number of studies have also been carried out for ethanol liquid sensing using SIW [21,22]. An inject-printed microstrip patch antenna is used as a sensor for liquid identification in [23]. In all these cases, whatever the liquid sample, water is always involved and the viable sensor is mostly based on microwave planar resonator technology.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Determining Liquid Concentration Using Multiband Annular Ring Microwave Sensor and Polarity Correlator

et al. 2020

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This article presents a new approach to determining liquid concentration using a new microwave sensor and polarity correlator. The sensor design incorporates an annular ring resonator having inside three parallel lines, a trapezoid ground plane and a co-planar waveguide (CPW) tapered feeder, which altogether achieve multiple frequency bands. Multiple bands of interest are obtained at the lower end of the microwave spectrum, i.e., from 1–6 GHz, as this region is widely accepted in analyzing various liquid samples. The sensor size is 71 × 40 × 1.6 mm3 with material selection based on an economically available FR4 substrate. The sensor is realized and experimentally validated for its sensitivity by utilizing in-lab prepared aqueous solution samples. Further, liquid concentration is determined by adopting a polarity correlator, which is applied to the sensor’s responses obtained at different values.

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“…For instance, Sharma et al realized a resistive ammonia (NH 3 ) sensor by screen printing silver electrodes at the terminals of a MWCNTs-based sensing film [15] and flexible substrates such as polytetrafluoroethylene (PTFE) or polyethylene terephthalate (PET) have been used to realize nitrogen dioxide (NO 2 ) and hydrogen sulfide (H 2 S) CNTs-based sensors, also working at room temperature [16,17]. Additionally, a volatile organic compound sensor has been realized on paper substrate by the inkjet printing method, exploiting radio-frequency measurements [18].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

Fort

Panzardi

Al‐Hamry

et al. 2019

Sensors

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The aim of this work is to investigate the gas sensing performance of single wall carbon nanotubes (SWCNTs)-based conductive sensors operating at low-medium temperatures (<250 • C). The investigated sensing films consists of an SWCNT network obtained by drop-casting a SWCNT suspension. Starting from this base preparation, different sensing devices were obtained by decorating the SWCNT network with materials suitable for enhancing the sensitivity toward the target gas. In particular, in this paper, nano-particles of gold and of TiO 2 were used. In the paper, the performance of the different sensing devices, in terms of response time, sensitivity toward NO 2 and cross-sensitivity to O 2 , CO and water vapor, were assessed and discussed. Sensors based on decorated SWCNT films showed high performance; in particular, the decoration with Au nano-particles allows for a large enhancement of sensitivity (reaching 10%/1 ppm at 240 • C) and a large reduction of response time. On the other hand, the addition of TiO 2 nanoparticles leads to a satisfactory improvement of the sensitivity as well as a significant reduction of the response time at moderate temperatures (down to 200 • C). Finally, the suitability of using Au decorated SWCNTs-based sensors for room temperature sensing is demonstrated.

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CNT-Based Inkjet-Printed RF Gas Sensor: Modification of Substrate Properties during the Fabrication Process

Cited by 32 publications

References 28 publications

Overcoming Variability in Printed RF: A Statistical Method to Designing for Unpredictable Dimensionality

Overcoming Variability in Printed RF: A Statistical Method to Designing for Unpredictable Dimensionality

A New Approach to Determining Liquid Concentration Using Multiband Annular Ring Microwave Sensor and Polarity Correlator

Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

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