Ultrasensitive NO2 gas sensor with insignificant NH3-interference based on a few-layered mesoporous graphene

Matatagui, Daniel; López-Sánchez, Jesús; Peña, Álvaro; Serrano, Aída; Campo, Adolfo del; Fuente, O. Rodrı́guez de la; Carmona, N.; Navarro, E.; Marı́n, P.; Horrillo, M.C.

doi:10.1016/j.snb.2021.129657

Cited by 34 publications

(34 citation statements)

References 43 publications

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“…Prior to the hydrolysis of the sol, six different environmentally friendly substances were used as corrosion inhibitors, i.e., L-cysteine, dimethyl glyoxime, quinine, 2-Aminopyridine, graphene sheets [ 30 ], and TiO 2 NPs, at a 0.02% weight/volume ratio (see Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

Hybrid Sol-Gel Coatings Doped with Non-Toxic Corrosion Inhibitors for Corrosion Protection on AZ61 Magnesium Alloy

Rodríguez-Alonso

López-Sánchez

Serrano

et al. 2022

Gels

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Physiological human fluid is a natural corrosive environment and can lead to serious corrosion and mechanical damages to light Mg–Al alloys used in prosthetics for biomedical applications. In this work, organic–inorganic hybrid coatings doped with various environmentally friendly and non-toxic corrosion inhibitors have been prepared by the sol-gel process for the corrosion protection of AZ61 magnesium alloys. Effectiveness has been evaluated by pH measurements, optical microscopy, and SEM during a standard corrosion test in a Hanks’ Balanced Salt Solution. The results showed that the addition of an inhibitor to the sol-gel coating can improve significantly the corrosion performance, being an excellent barrier for the L-cysteine-doped hybrid sol-gel films. The incorporation of TiO2 nanoparticles, 2-Aminopyridine and quinine organic molecules slowed down the corrosion rate of the Mg–Al alloy. Graphene oxide seemed to have the same response to corrosion as the hybrid sol-gel coating without inhibitors.

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Section: Methodsmentioning

confidence: 99%

Hybrid Sol-Gel Coatings Doped with Non-Toxic Corrosion Inhibitors for Corrosion Protection on AZ61 Magnesium Alloy

Rodríguez-Alonso

López-Sánchez

Serrano

et al. 2022

Gels

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“…Over the past two decades, thanks to the revival of interest in van der Waals materials aroused by the isolation of graphene [ 21 ], sensors based on layered materials have been presented as a real step forward in gas sensing. Their exceptionally large surface-area-to-volume ratio makes these materials strongly sensitive to adsorbed gases, and therefore they are promising candidates for gas detection [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. In fact, over the last years, several examples of NO 2 gas sensors based on van der Waals materials, operating even at room temperature, have been proved [ 26 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…Their exceptionally large surface-area-to-volume ratio makes these materials strongly sensitive to adsorbed gases, and therefore they are promising candidates for gas detection [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. In fact, over the last years, several examples of NO 2 gas sensors based on van der Waals materials, operating even at room temperature, have been proved [ 26 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Disposable WS2 Paper Sensor for Sub-ppm NO2 Detection at Room Temperature

et al. 2022

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We developed inexpensive and disposable gas sensors with a low environmental footprint. This approach is based on a biodegradable substrate, paper, and features safe and nontoxic electronic materials. We show that abrasion-induced deposited WS2 nanoplatelets on paper can be employed as a successful sensing layer to develop high-sensitivity and selective sensors, which operate even at room temperature. Its performance is investigated, at room temperature, against NO2 exposure, finding that the electrical resistance of the device drops dramatically upon NO2 adsorption, decreasing by ~42% (~31% half a year later) for 0.8 ppm concentration, and establishing a detection limit around~2 ppb (~3 ppb half a year later). The sensor is highly selective towards NO2 gas with respect to the interferents NH3 and CO, whose responses were only 1.8% (obtained for 30 ppm) and 1.5% (obtained for 8 ppm), respectively. Interestingly, an improved response of the developed sensor under humid conditions was observed (tested for 25% relative humidity at 23 °C). The high-performance, in conjunction with its small dimensions, low cost, operation at room temperature, and the possibility of using it as a portable system, makes this sensor a promising candidate for continuous monitoring of NO2 on-site.

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“…Studies have shown that porous or hollow nanostructures exhibit strong interface polarization and multiple reflection capabilities, which can help improve the electromagnetic wave (EMW) absorption capability of materials [6]. Carbon material is an ideal choice for practical application because of its inherent hydrophobicity, good thermal stability and electrical conductivity, low original density and excellent chemical corrosion resistance [7]. Meanwhile, the low density caused by the above structure will give the wave-absorbing coating lightweight performance.…”

Section: Introductionmentioning

confidence: 99%

Controllable Preparation of Fe3O4@RF and Its Evolution to Yolk–Shell-Structured Fe@C Composite Microspheres with High Microwave Absorbing Performance

Xue¹,

Lou²,

Yang³

2022

Coatings

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Fe3O4@RF microspheres with different phenolic (RF) layer thicknesses are prepared by adjusting the polymerization time. With the prepared Fe3O4@RF as the precursor, Fe@C composite microspheres with rattle-like morphology are obtained through one-step controlled carbonization. This method simplifies the preparation of rattle-shaped microspheres from sandwich microspheres. Fe@C microspheres exhibit excellent microwave absorbing properties. The morphology and composition of the product are investigated depending on the effects of carbonization temperature, time and thickness of the RF layer. When the carbonization temperature is 700 °C, the carbonization time is 12 h and the polymer shell thickness is 62 nm, the inner hollow Fe3O4 is completely reduced to Fe. The absorption properties of the materials are compared before and after the reduction of Fe3O4. Both Fe@C-12 and Fe3O4@C-700 show excellent absorbing properties. When the filler content is 50%, the maximum reflection loss (RLmax) of the rattle-shaped Fe@C microspheres is −50.15 dB, and the corresponding matching thickness is 3.5 mm. At a thickness of 1.7 mm, the RLmax of Fe3O4@C-700 is −44.42 dB, which is slightly worse than that of Fe@C-12. Both dielectric loss and magnetic loss play a vital role in electromagnetic wave absorption. This work prepares rattle-shaped absorbing materials in a simple way, which has significance for guiding the construction of rattle-shaped materials.

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Ultrasensitive NO2 gas sensor with insignificant NH3-interference based on a few-layered mesoporous graphene

Cited by 34 publications

References 43 publications

Hybrid Sol-Gel Coatings Doped with Non-Toxic Corrosion Inhibitors for Corrosion Protection on AZ61 Magnesium Alloy

Hybrid Sol-Gel Coatings Doped with Non-Toxic Corrosion Inhibitors for Corrosion Protection on AZ61 Magnesium Alloy

Eco-Friendly Disposable WS2 Paper Sensor for Sub-ppm NO2 Detection at Room Temperature

Controllable Preparation of Fe3O4@RF and Its Evolution to Yolk–Shell-Structured Fe@C Composite Microspheres with High Microwave Absorbing Performance

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