Pulsed Laser Ablation Synthesis of Diamond Molecules in Supercritical Fluids

Nakahara, S.; Stauss, Sven; Miyazoe, Hiroyuki; Shizuno, Tomoki; Suzuki, Minoru; Kataoka, Hiroshi; Sasaki, Takehiko; Terashima, Kazuo

doi:10.1143/apex.3.096201

Cited by 28 publications

(22 citation statements)

References 17 publications

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“…The most common are second harmonic (532 nm) Nd:YAG pulsed laser sources (e.g., Ref. [7]) that are operated with a repetition rate of a few Hz and pulse widths of a few nanoseconds (∼ 5 to 10 ns) and fluencies of a few tens of milli-Joules per pulse.…”

Section: Plasma Generation In High-density Mediamentioning

confidence: 99%

Pulsed Laser Ablation in High-Pressure Gases, Pressurized Liquids and Supercritical Fluids: Generation, Fundamental Characteristics and Applications

Stauss¹,

Urabe²,

Muneoka³

et al. 2016

Applications of Laser Ablation - Thin Film Deposition, Nanomaterial Synthesis and Surface Modification

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Pulsed laser ablation (PLA) in high-density media-high-pressure gases, liquids, and supercritical fluids-has shown to be promising for nanomaterials fabrication and as an analysis technique in extreme environments, for example, the exploration of deep ocean levels and planetary atmospheres and surfaces. Despite the high potential of this technique, it is still not very widely used. The objective of the present chapter is to present the reader with an overview of recent advances in the use of pulsed laser ablation in pressurized media, the fundamental characteristics, especially the dynamics of cavitation bubbles and the optical emission, and the applications to the fabrication of metallic and semiconductor nanoparticles, and diamond molecules, the so-called diamondoids. Finally, a short overview of the use of pulsed laser ablation in pressurized media as a promising tool for the analysis of extreme environments is presented.

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Section: Plasma Generation In High-density Mediamentioning

confidence: 99%

Pulsed Laser Ablation in High-Pressure Gases, Pressurized Liquids and Supercritical Fluids: Generation, Fundamental Characteristics and Applications

Stauss¹,

Urabe²,

Muneoka³

et al. 2016

Applications of Laser Ablation - Thin Film Deposition, Nanomaterial Synthesis and Surface Modification

Self Cite

View full text Add to dashboard Cite

show abstract

“…In these experiments, we especially focussed on the characterization of the samples by GC-MS (GCMS-QP2010 Plus, Shimadzu Corp.), using the same carrier gas and temperature ramp as described previously [22,24]. The GC-MS measurements were conducted by alternating between the selected ionmonitoring mode (SIM) and scan mode.…”

Section: Experimental Approachmentioning

confidence: 99%

“…Recently, it has been demonstrated that nanodiamonds [20] and diamondoids can be synthesized both by dielectric barrier discharges (DBDs) [21][22][23] and pulsed laser ablation plasmas in supercritical xenon (scXe) [24] and CO 2 [25]. In these reports, the diamondoids were characterized by energy-dispersive X-ray spectroscopy, micro-Raman spectroscopy, and gas chromatography -mass spectrometry (GC-MS).…”

Section: Introductionmentioning

confidence: 99%

Reaction yields of diamondoid synthesis by plasmas generated in supercritical xenon

Stauss

Shizuno

Miyazoe

et al. 2013

Trans. Mat. Res. Soc. Japan

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Diamondoids are sp3 -hybridized carbon nanomaterials that hold promise for application in biotechnology, medicine, and opto-and nanoelectronics. While difficult or even impossible to realize by conventional organic synthesis methods, the synthesis of larger diamondoids was demonstrated by plasmas generated in supercritical fluids, however, the reaction mechanisms that lead to their formation are not clear. Here, we investigated the synthesis of diamondoids from adamantane and present a simple model that predicts the reaction rates of diamantane, triamantane, and tetramantane. The diamondoids were synthesized by micro dielectric barrier discharges arranged in arrays, generated at frequencies of 7 kHz and applied voltages of 5 − 10 kV p−p in supercritical xenon (pressure 5.56 − 8.22 MPa, temperature 290.0 − 310.2 K). The collected samples were analyzed and quantified by gas chromatography -mass spectrometry measurements. The reaction yields of diamantane increase with increasing precursor density and longer reaction times. Experimental data also suggests a stepwise reaction of higher diamondoids from lower diamondoids, and predicts lower reaction rates for higher diamondoids when compared to lower diamondoids.

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“…Numerous reports in the last two decades have described the generation of various types of nanoparticles by PLA in supercritical uids (SCFs) (Saitow, 2005;Tomai et al, 2007;Saitow et al, 2008;Saitow and Yamamura, 2009;Nakahara et al, 2010Nakahara et al, , 2011Machmudah et al, 2011Machmudah et al, , 2013Kato et al, 2012). SCFs are non-condensable uids with high densities close to those of liquids in normal conditions.…”

Section: Introductionmentioning

confidence: 99%

Crystallinity of Carbon Nanoparticles Generated by Laser Ablation in Supercritical Carbon Dioxide

Higashi

Maejima

Yoshikawa

et al. 2021

J. Chem. Eng. Japan

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We fabricated carbon nanoparticles in a series of pulsed laser ablation (PLA) experiments with a graphite target using an Nd:YAG laser. The carbon nanoparticles were synthesized in a supercritical carbon dioxide (CO 2 ) medium at various temperatures and various pressures. We also investigated the e ect of CO 2 pressure (density) on the morphology of the fabricated nanocarbon particles under isothermal conditions at 308 K or maintaining a constant medium density. The carbon particles generated under the supercritical condition in the vicinity of 8 MPa exhibited a spherical shape with a peak diameter range of 20-30 nm. Some of the generated particles had a nano-crystalline, regular structure. The lattice spacings of these single crystals were 0.20 nm and 0.37 nm, which corresponded to lattice spacings of diamond and graphite, respectively. The di raction pattern of a selected area of the samples con rmed that the synthesized ne particles had a cubic-diamond crystal structure. The coarse particles, meanwhile, had a regular hexagonal-graphite structure. Raman spectroscopy of the synthetized nanoparticle samples revealed a phase transition from an amorphous structure to a mainly graphite structure in association with changes of the isobaric speci c heat capacity of the supercritical CO 2 . The temperature distribution pro le in the plasma plume was presumed to have a ected the crystalline fraction of the generated carbon nanoparticles.

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Pulsed Laser Ablation Synthesis of Diamond Molecules in Supercritical Fluids

Cited by 28 publications

References 17 publications

Pulsed Laser Ablation in High-Pressure Gases, Pressurized Liquids and Supercritical Fluids: Generation, Fundamental Characteristics and Applications

Pulsed Laser Ablation in High-Pressure Gases, Pressurized Liquids and Supercritical Fluids: Generation, Fundamental Characteristics and Applications

Reaction yields of diamondoid synthesis by plasmas generated in supercritical xenon

Crystallinity of Carbon Nanoparticles Generated by Laser Ablation in Supercritical Carbon Dioxide

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