Single-step route to diamond-nanotube composite

Varshney, Deepak; Ahmadi, Majid; Guinel, Maxime J.-F.; Weiner, Brad R.; Morell, Gerardo

doi:10.1186/1556-276x-7-535

Cited by 26 publications

(20 citation statements)

References 28 publications

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“…In the spectra results of PW, peaks at 2916 and 2848 cm −1 and this could be endorsed to the carbon‐hydrogen asymmetric and symmetric stretching vibrations. The symmetric CH bending absorption of the CH 3 group at around 1380 cm −1 , the CH deformation around 1460 cm −1 and the CH 2 rocking absorption band at 725 cm −1 confirmed the structure of PW 45 . The band in the range of 880 and 450 cm −1 is linked with the vibrational modes of titania 46 .…”

Section: Characterization Study On Nanocomposite Particles Dispersed mentioning

confidence: 52%

Effect of titania‐silver nanocomposite particle concentration and thermal cycling on characteristics of sodium dodecyl sulfate added paraffin wax thermal energy storage material

Bose

Amirtham²

2020

Energy Storage

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The present work focuses on analyzing the thermal properties of 0.5, 1 and 1.5 wt% of titania‐silver nanocomposite particles dispersed paraffin wax (NCDPW) PCM without and with sodium dodecyl sulfate (SDS) surfactant for both non‐cycled and thermal cycled samples. NCDPW without and with SDS was prepared using electromagnetic stirring and ultrasonication process. 1 wt% titania‐silver NCDPW with SDS in the mass ratio of 1:0.25 (NCP:SDS) is identified as optimum with an enhancement in thermal conductivity of 66.59%, better thermal decomposition stability upto 372°C, good physical interaction between nanocomposite particles (NCP) and paraffin wax (PW). Also, an enhancement in thermal storage efficiency (97.15%), reduction in onset melting time (35.50%) and onset freezing time (29.23%) compared to PW even after several thermal cycling process is achieved. Further, it showed a reduction in melting onset temperature to 59.2°C, an enhancement in melting heat capacity potential by 7.2% and freezing heat capacity potential by 7.7% after thermal cycling process. On the whole, the thermal properties of the base PW are increased due to the addition of titania‐silver NCP with SDS proving it, a promising energy storage medium for thermal energy storage.

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Section: Characterization Study On Nanocomposite Particles Dispersed mentioning

confidence: 52%

Effect of titania‐silver nanocomposite particle concentration and thermal cycling on characteristics of sodium dodecyl sulfate added paraffin wax thermal energy storage material

Bose

Amirtham²

2020

Energy Storage

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“…According to the mechanism, when paraffin wax is melted and cooled below the equilibrium melting temperature, it results in wax crystals (found in commercial candle wax) together with long chains of carbon. Under HFCVD conditions above the flash point, candle wax decomposes, leaving behind pre existing sp 2 and sp 3 -C crystallites 34 and sp 3 rich fragments on the Cu substrate surface which acts as nucleation centers for NCD growth. 35 These sp 3 C fragments generally consist of dangling carbon bonds which interact with the atomic hydrogen produced by the hot filament resulting in an enhanced number of nucleation centers for NCD crystals.…”

Section: Resultsmentioning

confidence: 99%

New route to the fabrication of nanocrystalline diamond films

Varshney

Palomino

Gil

et al. 2014

Journal of Applied Physics

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Nanocrystalline diamond (NCD) thin films offer applications in various fields, but the existing synthetic approaches are cumbersome and destructive. A major breakthrough has been achieved by our group in the direction of a non-destructive, scalable, and economic process of NCD thin-film fabrication. Here, we report a cheap precursor for the growth of nanocrystalline diamond in the form of paraffin wax. We show that NCD thin films can be fabricated on a copper support by using simple, commonplace paraffin wax under reaction conditions of Hot Filament Chemical Vapor Deposition (HFCVD). Surprisingly, even the presence of any catalyst or seeding that has been conventionally used in the state-of-the-art is not required. The structure of the obtained films was analyzed by scanning electron microscopy and transmission electron microscopy. Raman spectroscopy and electron energy-loss spectroscopy recorded at the carbon K-edge region confirm the presence of nanocrystalline diamond. The process is a significant step towards cost-effective and non-cumbersome fabrication of nanocrystalline diamond thin films for commercial production.

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“…forming composites . Several reports deal with a preparation of pure carbon‐carbon composites, especially CNTs and nanodiamond powders (ND) and in rare cases CNTs and nanocrystalline diamond (NCD) . In some cases a transformation of multi‐wall carbon nanotubes (MWNTs) to diamond/amorphous carbon was observed.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes overgrown and ingrown with nanocrystalline diamond deposited by different CVD plasma systems

Varga

Vretenár

Ižák

et al. 2014

Physica Status Solidi (b)

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In this work we investigate the growth of diamond film on a porous single-wall carbon nanotubes (SWNT) paper by employing three different Chemical Vapour Deposition (CVD) systems: plasma-assisted hot filament, focused microwave plasma and linear antenna microwave plasma. We observe that the diamond growth is strongly affected by the different conditions in each of the CVD processes resulting in different SWNT/diamond composite structures. It is also found that only the linear antenna microwave plasma CVD process allows penetration of the activated growth species into the volume of the SWNT paper, whereas using the other methods, the diamond grains are formed on the SWNT paper surface only. Moreover, the growth of diamond structures within the substrate volume is strongly influenced by the CH 4 /CO 2 /H 2 gas content ratio. A key factor influencing the formation of a compact SWNT/diamond composite is keeping the equilibrium between two competitive processes: establishing conditions where the diamond structure can grow while etching/damage of the SWNT paper is still kept at a minimum. The morphology and chemical composition of formed composite materials were characterized by scanning electron microscopy and Raman spectroscopy.

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Single-step route to diamond-nanotube composite

Cited by 26 publications

References 28 publications

Effect of titania‐silver nanocomposite particle concentration and thermal cycling on characteristics of sodium dodecyl sulfate added paraffin wax thermal energy storage material

Effect of titania‐silver nanocomposite particle concentration and thermal cycling on characteristics of sodium dodecyl sulfate added paraffin wax thermal energy storage material

New route to the fabrication of nanocrystalline diamond films

Carbon nanotubes overgrown and ingrown with nanocrystalline diamond deposited by different CVD plasma systems

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