CVD growth of self-assembled 2D and 1D WS2 nanomaterials for the ultrasensitive detection of NO2

Alagh, Aanchal; Annanouch, Fatima Ezahra; Umek, Polona; Bittencourt, Carla; Sierra-Castillo, Ayrton; Haye, Emile; Colomer, Jean-François; Llobet, Eduard

doi:10.1016/j.snb.2020.128813

Cited by 71 publications

(53 citation statements)

References 49 publications

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“…The responses were stable with a slight decrease in their values compared to those obtained under dry air. Such a decrease is common for the majority of the metal oxides in the presence of humidity [ 27 , 37 , 38 ]. It is related to the adsorption competition between the target gas molecules and the hydroxyl group –OH, at the sensing film surface [ 27 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

Annanouch

Martini-Laithier

Fiorido

et al. 2021

Sensors

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In this paper, we report the fabrication and characterization of a portable transdermal alcohol sensing device via a human finger, using tin dioxide (SnO2) chemoresistive gas sensors. Compared to conventional detectors, this non-invasive technique allowed us the continuous monitoring of alcohol with low cost and simple fabrication process. The sensing layers used in this work were fabricated by using the reactive radio frequency (RF) magnetron sputtering technique. Their structure and morphology were investigated by means of X-ray spectroscopy (XRD) and scanning electron microscopy (SEM), respectively. The results indicated that the annealing time has an important impact on the sensor sensitivity. Before performing the transdermal measurements, the sensors were exposed to a wide range of ethanol concentrations and the results displayed good responses with high sensitivity, stability, and a rapid detection time. Moreover, against high relative humidity (50% and 70%), the sensors remained resistant by showing a slight change in their gas sensing performances. A volunteer (an adult researcher from our volunteer group) drank 50 mL of tequila in order to realize the transdermal alcohol monitoring. Fifteen minutes later, the volunteer’s skin started to evacuate alcohol and the sensor resistance began to decline. Simultaneously, breath alcohol measurements were attained using a DRAGER 6820 certified breathalyzer. The results demonstrated a clear correlation between the alcohol concentration in the blood, breath, and via perspiration, which validated the embedded transdermal alcohol device reported in this work.

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Section: Resultsmentioning

confidence: 99%

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

Annanouch

Martini-Laithier

Fiorido

et al. 2021

Sensors

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“…From the Raman spectrum (shown in Figure 7 ), 2 important Raman peaks, characteristic of 2H-WS 2 were observed at 348 and 414 cm −1 . Additionally, two broad peaks with very low intensity were also detected at 701 and 804 cm −1 , indicating the presence of some WO 3 impurities that could be present in the bulk of the grown material [ 65 ].…”

Section: Resultsmentioning

confidence: 99%

On the Use of Pulsed UV or Visible Light Activated Gas Sensing of Reducing and Oxidising Species with WO3 and WS2 Nanomaterials

González

Casanova-Cháfer

Alagh

et al. 2021

Sensors

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This paper presents a methodology to quantify oxidizing and reducing gases using n-type and p-type chemiresistive sensors, respectively. Low temperature sensor heating with pulsed UV or visible light modulation is used together with the application of the fast Fourier transform (FFT) to extract sensor response features. These features are further processed via principal component analysis (PCA) and principal component regression (PCR) for achieving gas discrimination and building concentration prediction models with R2 values up to 98% and RMSE values as low as 5% for the total gas concentration range studied. UV and visible light were used to study the influence of the light wavelength in the prediction model performance. We demonstrate that n-type and p-type sensors need to be used together for achieving good quantification of oxidizing and reducing species, respectively, since the semiconductor type defines the prediction model's effectiveness towards an oxidizing or reducing gas. The presented method reduces considerably the total time needed to quantify the gas concentration compared with the results obtained in a previous work. The use of visible light LEDs for performing pulsed light modulation enhances system performance and considerably reduces cost in comparison to previously reported UV light-based approaches.

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“… Alagh et al (2021) reported for the first time on the facile synthesis of 2D layered WS 2 nanosheets assembled on 1D WS 2 nanostructures by combining the aerosol assisted chemical vapor deposition (AA-CVD) method with H 2 -free atmospheric pressure CVD. Then the WS 2 nanosheets was directly integrated into a standard ceramic sensor for an ultrasensitive detection of NO 2 .…”

Section: Biosensors Based On Non-covalent Interactions On the Surface...mentioning

confidence: 99%

A Review of Transition Metal Dichalcogenides-Based Biosensors

Sun

Yue

et al. 2022

Front. Bioeng. Biotechnol.

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Transition metal dichalcogenides (TMDCs) are widely used in biosensing applications due to their excellent physical and chemical properties. Due to the properties of biomaterial targets, the biggest challenge that biosensors face now is how to improve the sensitivity and stability. A lot of materials had been used to enhance the target signal. Among them, TMDCs show excellent performance in enhancing biosensing signals because of their metallic and semi-conducting electrical capabilities, tunable band gap, large specific surface area and so on. Here, we review different functionalization methods and research progress of TMDCs-based biosensors. The modification methods of TMDCs for biosensor fabrication mainly include two strategies: non-covalent and covalent interaction. The article summarizes the advantages and disadvantages of different modification strategies and their effects on biosensing performance. The authors present the challenges and issues that TMDCs need to be addressed in biosensor applications. Finally, the review expresses the positive application prospects of TMDCs-based biosensors in the future.

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CVD growth of self-assembled 2D and 1D WS2 nanomaterials for the ultrasensitive detection of NO2

Cited by 71 publications

References 49 publications

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

Embedded Transdermal Alcohol Detection via a Finger Using SnO2 Gas Sensors

On the Use of Pulsed UV or Visible Light Activated Gas Sensing of Reducing and Oxidising Species with WO3 and WS2 Nanomaterials

A Review of Transition Metal Dichalcogenides-Based Biosensors

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