Pulsed laser ablation of graphite in O2 atmosphere for preparation of diamond films and carbon nanotubes

Nakajima, Kiyomi; Furusawa, M.; Yamamoto, Takakazu; Tashiro, J.; Sasaki, Atsushi; Chikyow, Toyohiro; Ahmet, Parhat; Yamada, Hideaki; Yoshimoto, Mamoru

doi:10.1016/s0925-9635(01)00729-4

Cited by 14 publications

(8 citation statements)

References 21 publications

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“…4,5 Different kinds of nanoparticles such as graphitic nanofibers (GNFs), carbon nanotubes (CNTs), nanoclays, polyhedral oligomeric silsesquioxanes (POSS), and nanosilica (Aerosil ) have been used to enhance the properties of epoxy resins. [6][7][8][9] GNFs have attractive mechanical and physical properties and low cost with high availability among these nanoparticles. 10,11 In addition, GNFs have graphene layer structures with edges, which can be utilized for functionalization with bi-functional linkers to promote covalent bonding between these GNFs and polymer resin molecules.…”

Section: Introductionmentioning

confidence: 99%

FTIR study of ageing epoxy resin reinforced by reactive graphitic nanofibers

Jana

Zhong

2007

J of Applied Polymer Sci

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We previously developed a novel modified epoxy matrix for macrocomposites using reactive graphitic nanofibers (r-GNFs), which showed improved mechanical properties. This article is devoted to study the efficacy of the r-GNFs against the damage due to exposition of the matrix to hygrothermal environment and UV radiation. Moisture sorption characteristics of the pure epoxy and nanoepoxy were investigated and all kinds of matrices showed similar absorption behavior. Both diffusion and relaxation processes in sorption were observed. DSC curves of nonaged specimens of all concentrations confirmed that samples were not fully cured and r-GNFs lowered the curing degree. The effects of ageing were studied through the changes of molecular conformation by Fourier Transform infrared spectroscopy (FTIR). The results show that UV radiation assists in post-curing of the matrices. Hydroxyl unit, carbonyl unit, and epoxide unit were chosen to study the degradation. It is observed that the degradation due to UV radiation is more severe compared with that due to hygrothermal expose. It also reveals that r-GNFs resist the degradation of the epoxy resin; particularly, the nanoepoxy with 0.3 wt % of r-GNFs has the highest ageing resistance, which is in agreement with our previously tested results of mechanical properties.

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Section: Introductionmentioning

confidence: 99%

FTIR study of ageing epoxy resin reinforced by reactive graphitic nanofibers

Jana

Zhong

2007

J of Applied Polymer Sci

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“…So far, the growth of diamond, carbon nanofibers and carbon nanotubes has been mostly performed through chemical vapour deposition (CVD), arc discharge and pulsed laser ablation (PLA) deposition methods [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some authors have succeeded in performing the nucleation and growth of diamond films via PLA of graphite target in a low-pressure pure oxygen atmosphere [1].…”

Section: Introductionmentioning

confidence: 99%

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Carbon nanocrystals produced by pulsed laser ablation of carbon

Mangione

Torrisi

Picciotto

et al. 2005

Radiation Effects and Defects in Solids

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Plasma laser ablation experiments were performed irradiating glassy-carbon targets placed in vacuum through a pulsed Nd:YAG laser operating at the second harmonic (532 nm), 9 ns pulse width and 10 9 W/cm 2 density power.Thin films of ablated carbon were deposited on silicon oxide substrates placed at different distances and angles with respect to the target.The analysis of the deposited material was carried out by using surface profiler, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and Raman spectroscopy.Results show the evidence of carbon nanocrystals and nanostructures with dimension of the order of 100 nm deposited on the substrates together with a large amount of amorphous phase. The spectroscopic investigations and the SEM images indicate the formation of nanodiamond seeds as a nucleation process induced on the substrate surface. Nanostructures were investigated as a function of the laser intensity and angle distribution. Experimental results were compared with the literature data coming from nanodiamonds growth with different techniques.Experiments performed at Instituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) of Catania (Italy) and data analysis conducted at Dipartimento di Fisica and DFMTA of the Università of Messina (Italy), CNR-ITIS of Messina and ST-Microelectronics of Catania will be presented and discussed.

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“…PLD technique with high energy pulsed lasers is known to produce a number of different carbon forms, going from DLC to fullerene and nanotubes, generating carbon structures as the result of the high energy transferring process occurring to C-atoms and C-clusters both as neutrals and as ionic species. Nanosecond lasers with high pulse intensity can generate C ions with keV energies, high charge states and large clusters [4]. In this work the results of nucleation and growth of carbon nanostructures on SiO 2 surfaces, obtained by using PLD technique with a Nd:Yag laser ablating glassy carbon in vacuum, is presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Physical characterization of pulsed laser deposition of diamond-like nanostructures

et al. 2006

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Diamond-like carbon (DLC) films can be produced by Pulsed Laser Deposition (PLD) technique in vacuum. Energetic laser pulses, with intensity of the order of 10 10 W/cm 2 , can be employed to generate hot carbon plasmas from glassy carbon ablation. Particles ejected from plasma can be deposited and/or ion implanted on different substrates. Energetic particles diffuse on the substrate surface and may generate nucleation and nanostructures. In the present work a Nd:Yag laser radiation, 532 nm wavelength, 9 ns pulse duration and 30 Hz repetition rate, was employed to grow thin DLC films on SiO 2 substrates, placed at different distances and angles from the target. The PLD-generated plasma can be controlled "on line" by mass quadrupole spectrometry and time-of-flight techniques, in order to evaluate the atomic and molecular kinetic energy distributions. "Off line" investigations were performed on the deposited films by using scanning electron microscopy (SEM), atomic force microscopy (AFM), infrared-absorption spectroscopy (FTIR) and Raman spectroscopy. Nanostructures with cubic shape and 300 nm average size growth on SiO2 surface are investigated and discussed.

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Pulsed laser ablation of graphite in O2 atmosphere for preparation of diamond films and carbon nanotubes

Cited by 14 publications

References 21 publications

FTIR study of ageing epoxy resin reinforced by reactive graphitic nanofibers

FTIR study of ageing epoxy resin reinforced by reactive graphitic nanofibers

Carbon nanocrystals produced by pulsed laser ablation of carbon

Physical characterization of pulsed laser deposition of diamond-like nanostructures

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