Wafer-scale few-layer graphene growth on Cu/Ni films for gas sensing applications

Deokar, Geetanjali; Casanova-Cháfer, Juan; Rajput, Nitul S.; Aubry, Cyril; Llobet, Eduard; Jouiad, Mustapha; Costa, Pedro M. F. J.

doi:10.1016/j.snb.2019.127458

Cited by 32 publications

(46 citation statements)

References 64 publications

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“…This type of surface characterization performed prior to the growth process, provides a means of controlling the roughness of the graphene and graphite film. It should be noted that the host substrate undergoes some grain restructuring during graphene growth, which reduces the grain size slightly and increases the substrate surface roughness to some extent when compared to annealed catalyst foils and films 22 .…”

Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

“…A SLG with a polymer support layer as thin as 200 nm can float on the water surface. This setup is routinely used in the polymer assisted wet-chemical transfer processes 22,38 . Graphene and graphite are hydrophobic (with 80-90° of contact angle) 57 .…”

Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

“…It is evident that the device had excellent selectivity for NO 2 (200 ppm) when compared to other interferent gases, including SO 2 (200 ppm), H 2 (2%), CH 4 (200 ppm), CO 2 (2%), H 2 S (200 ppm), and NH 3 (200 ppm). One plausible reason is the high electrophilic nature of the NO 2 gas 22,68 . When adsorbed on the surface of graphene, it reduces the current electron uptake from the system.…”

Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

“…Catalytic chemical vapour deposition (CVD) is a known method to produce graphene and ultrathin graphite films (< 10 nm) with high structural quality and at reasonable costs [21][22][23][24][25][26][27] . However, in comparison with the graphene and ultrathin-graphite film growth 28 , the large-area growth and/or applications of NGF using CVD remain less explored 11,13,[29][30][31][32][33] .…”

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confidence: 99%

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Semi-transparent graphite films growth on Ni and their double-sided polymer-free transfer

Deokar

Genovese

Surya

et al. 2020

Sci Rep

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Nanorange thickness graphite films (NGFs) are robust nanomaterials that can be produced via catalytic chemical vapour deposition but questions remain regarding their facile transfer and how surface topography may affect their application in next-generation devices. Here, we report the growth of NGFs (with an area of 55 cm2 and thickness of ~ 100 nm) on both sides of a polycrystalline Ni foil and their polymer-free transfer (front- and back-side, in areas up to 6 cm2). Due to the catalyst foil topography, the two carbon films differed in physical properties and other characteristics such as surface roughness. We demonstrate that the coarser back-side NGF is well-suited for NO2 sensing, whereas the smoother and more electrically conductive front-side NGF (2000 S/cm, sheet resistance − 50 Ω/sq) could be a viable conducting channel or counter electrode in solar cells (as it transmits 62% of visible light). Overall, the growth and transfer processes described could help realizing NGFs as an alternative carbon material for those technological applications where graphene and micrometer-thick graphite films are not an option.

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Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

Section: Growth Of Fs-and Bs-ngf Polycrystalline Ni Foils Used For Gmentioning

confidence: 99%

mentioning

confidence: 99%

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Semi-transparent graphite films growth on Ni and their double-sided polymer-free transfer

Deokar

Genovese

Surya

et al. 2020

Sci Rep

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“…These electrons are eventually injected to graphene, shifting the Fermi level of graphene towards the conduction band. As a result, the number of holes in graphene decreases and the overall resistance increases [ 48 ]. The calibration curves presented in Figure 5 d reveal a better sensitivity for xylene compared to benzene and toluene.…”

Section: Resultsmentioning

confidence: 99%

Metal Oxide Nanoparticle-Decorated Few Layer Graphene Nanoflake Chemoresistors for the Detection of Aromatic Volatile Organic Compounds

Behi

Bohli

Casanova-Cháfer

et al. 2020

Sensors

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Benzene, toluene, and xylene, commonly known as BTX, are hazardous aromatic organic vapors with high toxicity towards living organisms. Many techniques are being developed to provide the community with portable, cost effective, and high performance BTX sensing devices in order to effectively monitor the quality of air. In this paper, we study the effect of decorating graphene with tin oxide (SnO2) or tungsten oxide (WO3) nanoparticles on its performance as a chemoresistive material for detecting BTX vapors. Transmission electron microscopy and environmental scanning electron microscopy are used as morphological characterization techniques. SnO2-decorated graphene displayed high sensitivity towards benzene, toluene, and xylene with the lowest tested concentrations of 2 ppm, 1.5 ppm, and 0.2 ppm, respectively. In addition, we found that, by employing these nanomaterials, the observed response could provide a unique double signal confirmation to identify the presence of benzene vapors for monitoring occupational exposure in the textiles, painting, and adhesives industries or in fuel stations.

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Carbon Nitride Thin Film‐Sensitized Graphene Field‐Effect Transistor: A Visible‐Blind Ultraviolet Photodetector

Palanisamy

Mitra

Batra

et al. 2022

Adv Materials Inter

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Ultraviolet (UV) photodetectors often suffer from the lack of spectral selectivity due to strong interference from visible light. In this study, the exceptional electrical properties of graphene and the unique optical properties of carbon nitride thin films (CNTFs) are used to design visible‐blind UV photodetectors. First, polycrystalline CNTFs with different thicknesses (12–94 nm) are produced by thermal vapor condensation. Compared to the bulk carbon nitride powder, these films have a considerable sp2 nitrogen deficiency, which is thickness dependent. In addition to showing a wider bandgap than the bulk counterpart, their optical absorption profile (in the ultraviolet–visible range) is unique. Critically, the absorbance falls sharply above 400 nm, making the CNTFs suitable for ultraviolet photodetection. As a result, graphene field‐effect transistors (GFETs) sensitized with CNTFs show 103 A W−1 responsivity to UV radiation, a stark contrast to the negligible value obtained in the visible spectrum. The effect of film thickness on the photoresponse is determined, with the thinner CNTF leading to much better device performance. The CNTF/GFET photodetectors are also characterized by their fast response and recovery times, 0.5 and 2.0 s, respectively. These findings pave a simple route for the development of sensitive, visible‐blind UV photodetectors.

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Wafer-scale few-layer graphene growth on Cu/Ni films for gas sensing applications

Cited by 32 publications

References 64 publications

Semi-transparent graphite films growth on Ni and their double-sided polymer-free transfer

Semi-transparent graphite films growth on Ni and their double-sided polymer-free transfer

Metal Oxide Nanoparticle-Decorated Few Layer Graphene Nanoflake Chemoresistors for the Detection of Aromatic Volatile Organic Compounds

Carbon Nitride Thin Film‐Sensitized Graphene Field‐Effect Transistor: A Visible‐Blind Ultraviolet Photodetector

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