Low Temperature CVD Grown Graphene for Highly Selective Gas Sensors Working under Ambient Conditions

Ricciardella, Filiberto; Vollebregt, Sten; Polichetti, T.; Alfano, Brigida; Massera, Ettore; Sarro, P.M.

doi:10.3390/proceedings1040445

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…Decreasing the anneal time from 90 min down to 5 min on Sample 1 still shows MLG growth with a quality similar to that reported in figure 6 for 90 min anneal. At a reduced anneal temperatures of 800 °C, we no longer observe any growth which is similar to our observations on CVD based MLG [34]. Figure 7 shows the comparison between the various anneal temperatures and times.…”

Section: Resultssupporting

confidence: 87%

Growth of multi-layered graphene on molybdenum catalyst by solid phase reaction with amorphous carbon

Ricciardella¹,

Vollebregt²,

Kurganova³

et al. 2019

2D Mater.

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A method to grow multi layers graphene (MLG) just by thermal annealing in an inert atmosphere is reported. A molybdenum (Mo) catalyst layer is used in combination with a solid amorphous carbon (a-C) source on top or below the Mo layer. The formation of MLG directly on top of the catalyst substrate surface is confirmed by Raman spectroscopy, atomic force microscopy, cross-section transmission electron microscopy, electron energy loss spectroscopy and x-ray photoelectron spectroscopy. Growth of MLG on top of the Mo catalyst is demonstrated both with a-C below and above the Mo layer. The growth mechanism is attributed to the diffusion of a-C through the Mo layer and precipitation into the graphene at the surface, similar to the growth by chemical vapour deposition (CVD) on a Ni catalyst. The role of the inert Ar/H 2 atmosphere, carbon thickness, catalyst thickness, anneal time and anneal temperature are reported. Fast growth of MLG (5 min) at 915 °C is demonstrated. The quality of MLG prepared by thermal annealing is at least as good as that of MLG synthesized by CVD. The relevant achievements presented in this study make the proposed technique a promising alternative to CVD based MLG.

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Section: Resultssupporting

confidence: 87%

Growth of multi-layered graphene on molybdenum catalyst by solid phase reaction with amorphous carbon

Ricciardella¹,

Vollebregt²,

Kurganova³

et al. 2019

2D Mater.

Self Cite

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“…Figure 5 adsorption of water molecules, differently from what occurs towards other analytes. In previous reports, we have demonstrated that MLG is three orders of magnitude (~6%-7%/ppm) more sensitive towards NO2 compared to RH [23]. MLG has also higher sensitivity upon ammonia (NH3) (~0.01%/ppm) than RH, provided that our material is not such affine to NH3 [22].…”

Section: Resultsmentioning

confidence: 63%

“…In this framework, here, we demonstrate that relatively defective and rough multi-layered graphene (MLG) is insensitive to humidity, while having previously proved that the same MLG is a very promising sensing material upon other analytes [21][22][23]. In those reports, we demonstrated that MLG shows a sensitivity up to~6%-7%/ppm towards nitrogen dioxide (NO 2 ).…”

Section: Introductionmentioning

confidence: 56%

“…The CVD growth process can induce some intrinsic defects, due to the reconstruction of the lattice in non-hexagonal rings, namely pentagons, hexagons and heptagons [26,59,60]. It is very likely that such defects, known as Stone-Wales defects and intrinsically ascribed to the CVD process, as well as edge defects are responsible of the weak and slow reactivity upon RH, while enhancing the reactivity upon other analytes [22,23,27]. This conclusion is strengthened by comparing the results with a previous work, where MLG was synthesized by LPE and deposited by drop-casting or through Langmuir−Schaefer technique [51,61].…”

Section: Resultsmentioning

confidence: 99%

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Low-Humidity Sensing Properties of Multi-Layered Graphene Grown by Chemical Vapor Deposition

Ricciardella

Vollebregt

Polichetti

et al. 2020

Sensors

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Humidity sensing is fundamental in some applications, as humidity can be a strong interferent in the detection of analytes under environmental conditions. Ideally, materials sensitive or insensitive towards humidity are strongly needed for the sensors used in the first or second case, respectively. We present here the sensing properties of multi-layered graphene (MLG) upon exposure to different levels of relative humidity. We synthesize MLG by chemical vapor deposition, as shown by Raman spectroscopy, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). Through an MLG-based resistor, we show that MLG is scarcely sensitive to humidity in the range 30%–70%, determining current variations in the range of 0.005%/%relative humidity (RH) well below the variation induced by other analytes. These findings, due to the morphological properties of MLG, suggest that defective MLG is the ideal sensing material to implement in gas sensors operating both at room temperature and humid conditions.

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“…This characteristic feature is related to the growing process, which can cause intrinsic defects due to the reconstruction of the lattice in non-hexagonal rings, such as pentagons, hexagons, and heptagons [21]. Thus, it is likely that such defects, which are intrinsically ascribed to the layer synthesis, together with the edge defects, are responsible for the poor reactivity to relative humidity while enhancing the reactivity to some volatile organic compounds, such as ethanol for example [22,23].…”

Section: Resultsmentioning

confidence: 99%

Unlocking the Carbyne-Enriched Nanocoating Sensitivity to Volatile Organic Vapors with Plasma-Driven Deposition onto Bulk Micromachined Silicon Membranes

et al. 2022

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Due to the unique combination of physicochemical and structural properties of carbyne-enriched nanocoatings, they can be used for the development of high-end electronic devices. We propose using it for the development of sensor platforms based on silicon bulk micromachined membranes that serve as a part of microcapacitors with flexible electrodes, with various sizes and topologies. The carbyne-enriched nanocoating was grown using the ion-assisted pulse-plasma deposition method in the form of 2D-ordered linear-chain carbon with interchain spacing in the range of approximately 4.8–5.03 Å. The main characteristics of the fabricated sensors, such as dynamic range, sensitivity, linearity, response, and recovery times, were measured as a function of the ethanol concentration and compared for the different sizes of the micromembranes and for the different surface states, such as patterned and non-patterned. The obtained results are the first step in the further optimization of these sensor platforms to reach more precise detection of volatile organic compounds for the needs of the healthcare, air monitoring, and other relevant fields of human health.

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Low Temperature CVD Grown Graphene for Highly Selective Gas Sensors Working under Ambient Conditions

Cited by 6 publications

References 5 publications

Growth of multi-layered graphene on molybdenum catalyst by solid phase reaction with amorphous carbon

Growth of multi-layered graphene on molybdenum catalyst by solid phase reaction with amorphous carbon

Low-Humidity Sensing Properties of Multi-Layered Graphene Grown by Chemical Vapor Deposition

Unlocking the Carbyne-Enriched Nanocoating Sensitivity to Volatile Organic Vapors with Plasma-Driven Deposition onto Bulk Micromachined Silicon Membranes

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