Ion irradiation induced structural modifications in diamond nanoparticles

Talapatra, Saikat; Cheng, Ju-Yin; Chakrapani, Nirupama; Trasobares, Susana; Cao, Ang; Vajtai, Róbert; Huang, Meng; Ajayan, Pulickel M.

doi:10.1088/0957-4484/17/1/052

Cited by 34 publications

(26 citation statements)

References 21 publications

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“…590 Ion irradiation has also been shown to be able to induce structural modifications in diamond nanoparticles. 617 The effects of irradiation on nanocluster thin films were studied by simulating the irradiation of porous nanocrystalline thin films with 5-30 keV Xe and Au ions. 618 It was reported that the films could be substantially densified by the irradiation while preserving nanocrystallinity.…”

Section: Phase Changes In Nanoparticlesmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

947

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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Section: Phase Changes In Nanoparticlesmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

947

591

View full text Add to dashboard Cite

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“…Therefore, the peak around 1547 cm À1 in Figure 4(c) is assigned to be the G band of graphite. The G peak is also associated with long-range order of sp 2 carbon [26]. Raman spectra corresponding to 5% and 10% hydrogen samples show a diamond peak at 1332 cm À1 and graphite peak at 1593 cm À1 , respectively.…”

Section: Methodsmentioning

confidence: 96%

Correlation between diamond grain size and hydrogen incorporation in nanocrystalline diamond thin films

Rakha

Gao

Cao

2012

Journal of Experimental Nanoscience

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Hydrogen-incorporated nanocrystalline diamond thin films have been deposited in microwave plasma enhanced chemical vapour deposition (CVD) system with various hydrogen concentrations in the Ar/CH 4 gas mixture. The bonding environment of carbon atoms was detected by Raman spectroscopy and the hydrogen concentration was determined by elastic recoil detection analysis. Incorporation of H 2 species into Ar-rich plasma was observed to markedly alter the microstructure of diamond films. Raman spectroscopy results showed that part of the hydrogen is bonded to carbon atoms. Raman spectra also indicated the increase of non-diamond phase with the decrease in crystallite size. The study addresses the effects of hydrogen trapping in the samples when hydrogen concentration in the plasma increased during diamond growth and its relation with defective grain boundary region.

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“…On the other hand, N incorporation via ion implantation can modify the properties of nanodiamond through controlled doping. Ion implantation can also be used to tailor their sp 3 to sp 2 ratio for the diamonds or related carbon materials by properly selecting the dose and energy of implantation [14][15][16]. In this way, hybrid structures of sp 2 and sp 3 form of carbon such as graphite with NCD are formed which further extend the diversity of building units for the novel composites and other applications.…”

Section: Introductionmentioning

confidence: 99%

Ion irradiation-induced modifications of diamond nanorods synthesised by microwave plasma chemical vapour deposition

Rakha

Taj

Gao

2012

Journal of Experimental Nanoscience

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Diamond nanorods (DNRs) synthesised by the high methane content in argon rich microwave plasma chemical vapour deposition (MPCVD) have been implanted with nitrogen ions. The nanorods were characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The DNRs consist of single-crystalline diamond cores of 3-5 nm in diameter and several tens of nanometres in length. For purification from nondiamond contents, hydrogen plasma etching of DNRs was performed. Structural modifications of etched DNRs were studied after irradiating with 50 keV nitrogen ions under the fluence of 5 Â 10 14 , 1 Â 10 15 , 5 Â 10 15 and 1 Â 10 16 ions cm À2 . Nitrogen-ion implantation changes the carbon-carbon bonding and structural state of the nanocrystalline diamond (NCD). Raman spectroscopy was used to study the structure before and after ion irradiation, indicating the coexistence of diamond and graphite in the samples. The results indicated the increase in graphitic and sp 2 -related content, at the expense of decrease in diamond crystallinity, for ion implantation dose of 5 Â 10 15 cm À2 and higher. The method proves valuable for the formation of hybrid nanostructures with controlled fractions of sp 3 -sp 2 bonding.

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Ion irradiation induced structural modifications in diamond nanoparticles

Cited by 34 publications

References 21 publications

Ion and electron irradiation-induced effects in nanostructured materials

Ion and electron irradiation-induced effects in nanostructured materials

Correlation between diamond grain size and hydrogen incorporation in nanocrystalline diamond thin films

Ion irradiation-induced modifications of diamond nanorods synthesised by microwave plasma chemical vapour deposition

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