Channelling and induced defects at ion-bombarded aligned multiwall carbon nanotubes

D’Acunto, Giulio; Ripanti, Francesca; Postorino, P.; Betti, Maria Grazia; Scardamaglia, Mattia; Bittencourt, Carla; Mariani, Carlo

doi:10.1016/j.carbon.2018.07.032

Cited by 27 publications

(25 citation statements)

References 46 publications

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“…Finally the component at about 286.3–287.0 eV is due to the residual C–O bond in the different possible CO

configurations [ 44 , 45 , 46 ]. We underline that there is not any low-BE C 1s core-level component associated with unsaturated C dangling bonds at vacancy sites [ 10 , 23 , 68 , 69 , 70 , 71 ], not even in the deuterated sample, demonstrating the absolutely non-destructive deuteration of NPG.…”

Section: Results and Discussionmentioning

confidence: 90%

Deuterium Adsorption on Free-Standing Graphene

et al. 2021

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A suitable way to modify the electronic properties of graphene—while maintaining the exceptional properties associated with its two-dimensional (2D) nature—is its functionalisation. In particular, the incorporation of hydrogen isotopes in graphene is expected to modify its electronic properties leading to an energy gap opening, thereby rendering graphene promising for a widespread of applications. Hence, deuterium (D) adsorption on free-standing graphene was obtained by high-energy electron ionisation of D2 and ion irradiation of a nanoporous graphene (NPG) sample. This method allows one to reach nearly 50 at.% D upload in graphene, higher than that obtained by other deposition methods so far, towards low-defect and free-standing D-graphane. That evidence was deduced by X-ray photoelectron spectroscopy of the C 1s core level, showing clear evidence of the D-C sp3 bond, and Raman spectroscopy, pointing to remarkably clean and low-defect production of graphane. Moreover, ultraviolet photoelectron spectroscopy showed the opening of an energy gap in the valence band. Therefore, high-energy electron ionisation and ion irradiation is an outstanding method for obtaining low defect D-NPG with a high D upload, which is very promising for the fabrication of semiconducting graphane on large scale.

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“…Finally the component at about 286.3–287.0 eV is due to the residual C–O bond in the different possible CO

Section: Results and Discussionmentioning

confidence: 90%

Deuterium Adsorption on Free-Standing Graphene

et al. 2021

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“…The component at 284.2 eV is characteristic of photoelectrons emitted from carbon atoms, associated with sp 2 carbon systems in the “graphite-like” [42]. The peak reproduced at 290.5 eV is also characteristic of sp 2 carbon systems, but in this case due to the π-π* interactions and π plasmon, which is derived from the energy loss due to the excitation of π electrons [43]. Components associated with carbon in amorphous or sp 3 configuration appear at 285.0 eV [44], and defects associated with carbon vacancies appear at 282.9eV [45].…”

Section: Resultsmentioning

confidence: 99%

Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature

Casanova-Cháfer

García‐Aboal

Atienzar

et al. 2019

Sensors

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This paper explores the gas sensing properties of graphene nanolayers decorated with lead halide perovskite (CH3NH3PbBr3) nanocrystals to detect toxic gases such as ammonia (NH3) and nitrogen dioxide (NO2). A chemical-sensitive semiconductor film based on graphene has been achieved, being decorated with CH3NH3PbBr3 perovskite (MAPbBr3) nanocrystals (NCs) synthesized, and characterized by several techniques, such as field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Reversible responses were obtained towards NO2 and NH3 at room temperature, demonstrating an enhanced sensitivity when the graphene is decorated by MAPbBr3 NCs. Furthermore, the effect of ambient moisture was extensively studied, showing that the use of perovskite NCs in gas sensors can become a promising alternative to other gas sensitive materials, due to the protective character of graphene, resulting from its high hydrophobicity. Besides, a gas sensing mechanism is proposed to understand the effects of MAPbBr3 sensing properties.

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“…The C1s spectrum is reproduced by five components centered at binding energy 284.4 eV, 285.5 eV, 287.2 eV, 288.9 eV, and 291.4 eV (Figure 3a). The components at 284.4 eV and 291.0 eV are characteristic of sp 2 carbon systems, the first can be associated to photoelectrons emitted from carbon atoms in the carbon nanotube ‘graphite-like’ walls, while the second reflects the electron energy loss peak due to the collective excitation of π electrons, the so-called π plasmon [22,23]. The other three components are associated to photoelectrons emitted from carbon atoms at sp 3 bonds, oxygen-containing groups such as C–O and in carboxylic groups, respectively [24].…”

Section: Resultsmentioning

confidence: 99%

Gas Sensing with Iridium Oxide Nanoparticle Decorated Carbon Nanotubes

Casanova-Cháfer

Navarrete

Noirfalise

et al. 2018

Sensors

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The properties of multi-wall carbon nanotubes decorated with iridium oxide nanoparticles (IrOx-MWCNTs) are studied to detect harmful gases such as nitrogen dioxide and ammonia. IrOx nanoparticles were synthetized using a two-step method, based on a hydrolysis and acid condensation growth mechanism. The metal oxide nanoparticles obtained were employed for decorating the sidewalls of carbon nanotubes. Iridium-oxide nanoparticle decorated carbon nanotube material showed higher and more stable responses towards NH3 and NO2 than bare carbon nanotubes under different experimental conditions, establishing the optimal operating temperatures and estimating the limits of detection and quantification. Furthermore, the nanomaterials employed were studied using different morphological and compositional characterization techniques and a gas sensing mechanism is proposed.

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Channelling and induced defects at ion-bombarded aligned multiwall carbon nanotubes

Cited by 27 publications

References 46 publications

Deuterium Adsorption on Free-Standing Graphene

Deuterium Adsorption on Free-Standing Graphene

Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature

Gas Sensing with Iridium Oxide Nanoparticle Decorated Carbon Nanotubes

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