Thermal relaxation of ion-irradiation damage in graphite

Asari, E.; Kitajima, Masahiro; Nakamura, Kazutaka G.; Kawabe, T.

doi:10.1103/physrevb.47.11143

Cited by 60 publications

(50 citation statements)

References 19 publications

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“…We conclude that there are TSE centres in the graphene structure, where light can be produced as a result of electron transitions between localised states. Activation energy of the process is of the order of 1 eV, which is close to activation energy for defect relaxation in graphite [2]. In our opinion, relaxations of some kind of defects created in graphene layers by β-radiation can lead to TSE production.…”

Section: Introductionmentioning

confidence: 88%

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Luminescence fromβ-Irradiated Graphene Layers

et al. 2006

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We found that β-irradiated samples of crystallite graphite and multi--walled carbon nanotubes emit light during heating above room temperature. This behaviour is rather surprising for semimetals. Due to the lack of deep enough energy gap, this optical emission cannot be associated with interband transitions, as it is usually assumed in a thermally stimulated luminescence model. We suppose that the reported accumulated luminescence is the result of thermally stimulated relaxation of some kind of defects created in graphene structures by ionising radiation and therefore we offer to name it the relaxoluminescence. We anticipate the relaxoluminescence to be a starting point for developing a new spectroscopic method for nanotechnology. It can also throw a new light on the nature of defects, which are suspected of being responsible for strange magnetic effects in carbon.

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Section: Introductionmentioning

confidence: 88%

“…• C is close to activation energy of disorder-induced D line decay (0.89 eV) obtained in Raman experiments with irradiated graphite [2]. The RXL maximum recorded at 205…”

Section: Discussionmentioning

confidence: 99%

Luminescence fromβ-Irradiated Graphene Layers

et al. 2006

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“…[8] On the other hand, two such relaxation processes have also been reported for graphite irradiated with He+ ions [16]. According to the report, the fast and slow relaxation processes correspond to the vacancy-interstitial recombination and vacancy migration in the graphene plane, respectively, which have the activation energies of 0.89 eV and 1.8 eV.…”

Section: Figurementioning

confidence: 97%

“…As the previous analysis of the thermal relaxation kinetics of defects for graphite [16], the dependence of the R on annealing time for SWCNTs as shown in Fig. 3 was analyzed on the following three assumptions: (i) the I D /I G , or R is proportional to the density of defects in SWCNTs, (ii) some of the defects and others are annihilated by the fast and slow relaxation processes, respectively, and (iii) both processes occur independently.…”

Section: Analysis Of Recovery Of D Band By Themal Annealingmentioning

confidence: 99%

Characterization of Laser-Induced Defect Sand Modification in Carbon Nanotubes by Raman Spectroscopy

Tachibana¹

2013

Physical and Chemical Properties of Carbon Nanotubes

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“…Os autores simularam feixes de CH + 3 e Ar + incidindo perpendicularmente na parede dos nanotubos (multiparede e/ou feixes (bundles)), onde foi observado que o produto destes impactos podem ser: moléculas adsorvidas nas paredes dos nanotubos; defeitos nas paredes dos tubos -vacâncias, interstício e pares de Frankel; e a formação de interconexões entre as paredes dos nanotubos através dos defeitos. Na mesma linha de pesquisa, simulações utilizando potenciais empíricos [41,[44][45][46][47][48][49][50][51] vêm sendo extensivamente estudadas para entender o processo de formação dos defeitos. Foram testadas diferentes fontes (He, N e, Ar, Kr e Xe), variando a intensidade do feixe, e investigado como os defeitos são formados e quaĺ e a densidade desses defeitos para cada configuração.…”

Section: Introductionunclassified

Estudo da influência de defeitos estruturais nas propriedades de nanotubos de carbono

Amorim¹

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Unitermos: 1. Física do Estado Sólido; 2. Física do Estado Sólido -Defeitos estruturais; 3. Física do Estado Sólido -Propriedades estruturais e mecânicas; 4. Nanotecnologia -Nanotubos; 5. Simulação computacional -Teoria do funcional da densidade. USP/IF/SBI-088/2009Dedico esta tese ao meu irmão Guilherme. AbstractWe have investigated the influence of defects on structural, electronic and mechanical properties of single-walled carbon nanotubes (SWCNT), bundles of nanotubes and multi-walled carbon nanotubes (MWCNT). All our results were obtained with the first principles theory of total energy -Density Functional theory (DFT). We have investigated the structural properties of four defects in single-walled nanotubes:Stone-Wales (5577), monovacancy and two divacancies (585) and (555777). We show the behavior of the formation energy as a function of tube diameter for all structures. In this study, we have observed that divacancies have a stability reversal, when we compare the formation energies of these defects in nanotubes and graphene and, moreover, they are the most important defects in the modification of transport properties of SWCNT. We have studied the stability and transport properties of these systems. The defect 585 is less stable in graphene due to two breaks bonds in pentagons. We have observed that the 555777 becomes more stable than the 585, for armchair (zigzag) with a diameter of about 40Å (53Å), respectively.We have studied the structural and mechanics properties of bundles of carbon nanotubes with vacancy-vacancy defects, V 1 2 and V 2 2 . Due to carbon nanotube geometric structure these defects have lower formation energy than in graphene.These defects can form connections between the walls of this bunldes and we present how this imperfection can change the shear modulus of this nanotubes. We have also studied the barrier to form the connection with the method " Nudged Elastic Abstract vi

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Thermal relaxation of ion-irradiation damage in graphite

Cited by 60 publications

References 19 publications

Luminescence fromβ-Irradiated Graphene Layers

Luminescence fromβ-Irradiated Graphene Layers

Characterization of Laser-Induced Defect Sand Modification in Carbon Nanotubes by Raman Spectroscopy

Estudo da influência de defeitos estruturais nas propriedades de nanotubos de carbono

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