Topological line defects in graphene for applications in gas sensing

Souza, Fábio A. L. de; Amorim, Rodrigo G.; Prasongkit, Jariyanee; Scopel, Wanderlã L.; Scheicher, Ralph H.; Rocha, Alexandre Reily

doi:10.1016/j.carbon.2017.11.029

Cited by 47 publications

(44 citation statements)

References 51 publications

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“…This unique structural feature results in outstanding physicochemical properties, including extremely large specific surface area, excellent mechanical property, and high electrical conductivity. The application of graphene in various fields, such as sensors, electrodes, and nanofiller, has been frequently reported [ 10 , 11 , 12 , 13 , 14 , 15 ]. Particularly, the graphene framework can be employed as an ideal support for the incorporation of various functional materials [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Facile One-Step Fabrication of Phthalocyanine–Graphene–Bacterial–Cellulose Nanocomposite with Superior Catalytic Performance

Hong

Chen

2020

Nanomaterials

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It is generally accepted that the convenient fabrication of a metal phthalocyanine-based heterogeneous catalyst with superior catalytic activity is crucial for its application. Herein, a novel and versatile ultrasonic-assisted biosynthesis approach (conducting ultrasonic treatment during biosynthesis process) was tactfully adopted for the direct immobilization of a sulfonated cobalt phthalocyanine (PcS) catalyst onto a graphene–bacterial cellulose (GBC) substrate without any modification. The prepared phthalocyanine–graphene–bacterial–cellulose nanocomposite, PcS@GBC, was characterized by field emission scanning electron microscope (FESEM) and X-ray photoelectron spectroscopy (XPS). The catalytic activity of the PcS@GBC was evaluated based on its catalytic oxidation performance to dye solution, with H2O2 used as an oxidant. More than a 140% increase of dye removal percentage for the PcS@GBC heterogeneous catalyst was found compared with that of PcS. The unique hierarchical architecture of the GBC substrate and the strong interaction between PcS and graphene, which were verified experimentally by ultraviolet-visible light spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR) and theoretically by density functional theory (DFT) calculation, were synergistically responsible for the substantial enhancement of catalytic activity. The accelerated formation of the highly reactive hydroxyl radical (·OH) for PcS@GBC was directly evidenced by the electron paramagnetic resonance (EPR) spin-trapping technique. A possible catalytic oxidation mechanism for the PcS@GBC–H2O2 system was illustrated. This work provides a new insight into the design and construction of a highly reactive metal phthalocyanine-based catalyst, and the practical application of this functional nanomaterial in the field of environmental purification is also promising.

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Section: Introductionmentioning

confidence: 99%

Facile One-Step Fabrication of Phthalocyanine–Graphene–Bacterial–Cellulose Nanocomposite with Superior Catalytic Performance

Hong

Chen

2020

Nanomaterials

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“…However, this limitation can be turned into an opportunity if, properly engineered, such defects [28,[35][36][37][38][39][40] are exploited to induce phenomena, as valley filtering [41], of great fundamental and potentially technological interest. The increased chemical reactivity of these extended line defects can also find application in gas [42] or ion [43] sensors. Thermal management is another critical aspect of nanodevice design, so it comes as no surprise that the unique thermal transport properties of graphene have also attracted great attention [44].…”

Section: Introductionmentioning

confidence: 99%

Growth, charge and thermal transport of flowered graphene

Cresti

Carrete

Okuno

et al. 2020

Carbon

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We report on the structural and transport properties of the smallest dislocation loop in graphene, known as a flower defect. First, by means of advanced experimental imaging techniques, we deduce how flower defects are formed during recrystallization of chemical vapor deposited graphene. We propose that the flower defects arise from a bulge type mechanism in which the flower domains are the grains left over by dynamic recrystallisation. Next, in order to evaluate the use of such defects as possible building blocks for all-graphene electronics, we combine multiscale modeling tools to investigate the structure and the electron and phonon transport properties of large monolayer graphene samples with a random distribution of flower defects. For large enough flower densities, we find that electron transport is strongly suppressed while, surprisingly, hole transport remains almost unaffected. These results suggest possible applications of flowered graphene for electron energy filtering. For the same defect densities, phonon transport is reduced by orders of magnitude as elastic scattering by defects becomes dominant. Heat transport by flexural phonons, key in graphene, is largely suppressed even for very low concentrations.

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“…For example, it can be used to produce field effect transistor [23,24] or negative differential resistance devices [25], to filter the electronic or phononic valleys [26,27], and to introduce [20] or modulate [28,29] magnetic characteristics. Divacancy can adsorb some gas molecules [21,22], which indicates that it can be used to produce gas sensors [30]. Therefore, in order to take advantage and employ divacancies, we will intentionally introduce them into graphene.…”

Section: Introductionmentioning

confidence: 99%

Effects of Divacancy and Extended Line Defects on the Thermal Transport Properties of Graphene Nanoribbons

Luo

2019

Nanomaterials

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The effects of divacancy, including isolated defects and extended line defects (ELD), on the thermal transport properties of graphene nanoribbons (GNRs) are investigated using the Nonequilibrium Green’s function method. Different divacancy defects can effectively tune the thermal transport of GNRs and the thermal conductance is significantly reduced. The phonon scattering of a single divacancy is mostly at high frequencies while the phonon scattering at low frequencies is also strong for randomly distributed multiple divacancies. The collective effect of impurity scattering and boundary scattering is discussed, which makes the defect scattering vary with the boundary condition. The effect on thermal transport properties of a divacancy is also shown to be closely related to the cross section of the defect, the internal structure and the bonding strength inside the defect. Both low frequency and high frequency phonons are scattered by 48, d5d7 and t5t7 ELD. However, the 585 ELD has almost no influence on phonon scattering at low frequency region, resulting in the thermal conductance of GNRs with 585 ELD being 50% higher than that of randomly distributed 585 defects. All these results are valuable for the design and manufacture of graphene nanodevices.

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Topological line defects in graphene for applications in gas sensing

Cited by 47 publications

References 51 publications

Facile One-Step Fabrication of Phthalocyanine–Graphene–Bacterial–Cellulose Nanocomposite with Superior Catalytic Performance

Facile One-Step Fabrication of Phthalocyanine–Graphene–Bacterial–Cellulose Nanocomposite with Superior Catalytic Performance

Growth, charge and thermal transport of flowered graphene

Effects of Divacancy and Extended Line Defects on the Thermal Transport Properties of Graphene Nanoribbons

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