Different spectroscopic behavior of coupled and freestanding monolayer graphene deposited by CVD on Cu foil

Luca, Oreste De; Grillo, Rossella; Castriota, Marco; Policicchio, Alfonso; Santo, Maria Penelope De; Desiderio, Giovanni; Fasanella, Angela; Agostino, R. G.; Cazzanelli, E.; Giarola, Marco; Mariotto, G.

doi:10.1016/j.apsusc.2018.07.064

Cited by 8 publications

(3 citation statements)

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“…Besides that, the exposure of the active area of the Cu and its oxides is also important when modified by using the graphene [25]. In 2018, the scientists found that the oxidation of the Cu surface can decrease the coupling between the graphene and the metal and thus can obtain freestanding-like characteristics for graphene [26]. Here, the free-standing compounds of Cu/Cu 2 O/CuO with graphene modification was formed by two steps and then used for glucose detection.…”

Section: Introductionmentioning

confidence: 99%

Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Ren¹,

Dong²,

Liu³

2022

Nanotechnology

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Free-standing Cu/Cu2O/CuO modified by graphene was formed through two steps: Firstly, the commercial Cu foil was thermal annealed to form Cu/Cu2O/CuO; Secondly, the Cu/Cu2O/CuO was modified by graphene through electrochemical exfoliated method. The SEM, XRD，TEM and XPS have been used to characterize the morphology, the crystalline phase, and the surface composition of the hybrid electrode as-prepared. The effects of Cu and its oxides on graphene has been uncovered by the Raman results. The sensitivity of the glucose sensor in 0.1M NaOH by using the as-prepared hybrid material reaches 3102µA·mM-1cm-2 within a linear range of 0.002-2.88mM, which is better than that of the Cu/graphene and the Cu/Cu2O/CuO prepared at the same conditions. The sensor also shows excellent anti-interference ability, good cycling stability and time stability. The advantage of the sensor is caused by the strengthened synergistic effects between the graphene and the Cu/Cu2O/CuO due to the alleviated detrimental effects of the metal on the property of the graphene through using oxides middle layer as well as the large active area that obtained. This work provides a new way to study the effects of graphene in improving the property of the metal oxide especially in using for glucose sensor.

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Section: Introductionmentioning

confidence: 99%

Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Ren¹,

Dong²,

Liu³

2022

Nanotechnology

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“…In the case of graphene placed on a uniform dielectric substrate, differential contrast of the scanning electron microscopy (SEM) image of flakes with different thicknesses is attributed to a dependence of the electron emission on the local work function of the 2D material. , This dependency introduces a suppression effect of the SE emission, which is primarily controlled by the increase in the number of graphene layers, or a reconstructed moiré in the case of heterostructures . The electron microscopy (EM)-based techniques provide a high resolution that merits more attention to correlate nonelectron-based and lower resolution methods with SEM or transmission EM (TEM) acquired from the same sample location. − Correlative characterization across multiple techniques bridges resolution gaps and explains the properties of a material on the basis of spatially resolved co-located spectroscopic signals with in-plane imaging. − Additionally, EM can be used to examine 2D materials in the cross-sectional view using a focused ion beam (FIB) system to prepare site-specific lamella from 2D flakes. , To the best of our knowledge, correlation between SEM and cross-sectional TEM has not been applied previously to count and confirm the number of 2D layers determined from SEM image contrast. Correlation of SE emission from flakes with different thicknesses can be essential because the assumption that the highest SE emission occurs from a monolayer may not be correct. , Hence, correlative methods on the same flake can help determine the relation between SEM image contrast and the number of 2D layers.…”

Section: Introductionmentioning

confidence: 99%

Scalable Characterization of 2D Gallium-Intercalated Epitaxial Graphene

El‐Sherif

Briggs

Bersch

et al. 2021

ACS Appl. Mater. Interfaces

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Scalable synthesis of two-dimensional gallium (2D-Ga) covered by graphene layers was recently realized through confinement heteroepitaxy using silicon carbide substrates. However, the thickness, uniformity, and area coverage of the 2D-Ga heterostructures have not previously been studied with high-spatial resolution techniques. In this work, we resolve and measure the 2D-Ga heterostructure thicknesses using scanning electron microscopy (SEM). Utilizing multiple correlative methods, we find that SEM image contrast is directly related to the presence of uniform bilayer Ga at the interface and a variation of the number of graphene layers. We also investigate the origin of SEM contrast using both experimental measurements and theoretical calculations of the surface potentials. We find that a carbon buffer layer is detached due to the gallium intercalation, which increases the surface potential as an indication of the 2D-Ga presence. We then scale up the heterostructure characterization over a few-square millimeter area by segmenting SEM images, each acquired with nanometer-scale in-plane resolution. This work leverages the spectroscopic imaging capabilities of SEM that allows high-spatial resolution imaging for tracking intercalants, identifying relative surface potentials, determining the number of 2D layers, and further characterizing scalability and uniformity of low-dimensional materials.

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“…Raman spectroscopy has been widely used for studying many kinds of systems, such as: semiconductors, polymeric gel, phthalocyanine films, carbon-based systems (graphene and nanotubes), biopolymers, biomimetic biological systems and so on [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

2023

Self Cite

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In this work, the implementation of an electrochromic device (10 cm × 10 cm in size) for energy saving applications has been presented. As electrochromic system has been used with an electrochromic solution (ECsol) made by ethyl viologen diperchlorate [EV(ClO4)2], 1,1′-diethyl ferrocene (DEFc) and propylene carbonate (PC), as solvent. The final system has been obtained by mixing the ECsol, described above, with a polymeric system made by Bisphenol-A glycerolate (1 glycerol/phenol) diacrylate (BPA) and 2,2-Dimethoxy-2-phenylacetophenone (Irgacure 651) in a weight percentage equal to 60:40% w/w, respectively. Lithography has been used to make a spacer pattern with a thickness of about 15–20 µm between the two substrates. Micro-Raman spectroscopy confirmed the presence of the EV•+ as justified by the blue color of the electrochromic device in the ON state. Electrochemical and optical properties of the electrochromic device have been studied. The device shows reversible electrochromic behavior as confirmed by cyclic color variation due to the reduction and oxidation process of the EV2+/EV•+ couple. The electrochromic device shows a variation of the % transmittance in the visible region at 400 nm of 59.6% in the OFF state and 0.48% at 3.0 V. At 606 nm the transmittance in the bleached state is 84.58% in the OFF state and then decreases to 1.01% when it is fully colored at 3.0 V. In the NIR region at 890 nm, the device shows a transmittance of 74.3% in the OFF state and 23.7% at 3.0 V while at 1165 nm the values of the transmittance changed from 83.21% in the OFF state to 1.58% in the ON state at 3.0 V. The electrochromic device shows high values of CCR% and exhibits excellent values of CE in both visible and near-infrared regions when switched between OFF/ON states. In the NIR region at 890 nm, electrochromic devices can be used for the energy-saving of buildings with a promising CE of 120.9 cm2/C and 420.1 cm2/C at 1165 nm.

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Different spectroscopic behavior of coupled and freestanding monolayer graphene deposited by CVD on Cu foil

Abstract: Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Cited by 8 publications

References 58 publications

Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Scalable Characterization of 2D Gallium-Intercalated Epitaxial Graphene

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

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Different spectroscopic behavior of coupled and freestanding monolayer graphene deposited by CVD on Cu foil

Abstract: Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Cited by 8 publications

References 58 publications

Free-standing hybrid material of Cu/Cu2O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Free-standing hybrid material of Cu/Cu2O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Scalable Characterization of 2D Gallium-Intercalated Epitaxial Graphene

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

Contact Info

Product

Resources

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Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection

Free-standing hybrid material of Cu/Cu₂O/CuO modified by graphene with commercial Cu foil using for non-enzymatic glucose detection