Diamond Nanorods from Carbon Nanotubes

Sun, Litao; Gong, Jinlong; Zhu, Dong; Zhang, Zhu; He, Songnian

doi:10.1002/adma.200400429

Cited by 110 publications

(62 citation statements)

References 34 publications

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“…28 Density functional tight binding calculations demonstrated that formation of interlayer C-C bonds in bilayer graphene, resulting from the insertion of atomic defects, leads to a decrease in the electronic conductance of the material but also to significant electronic transport between the layers. 28 Creation of interlayer C-C bonds also has been studied in multi-walled carbon nanotubes (MWCNTs), 29 aiming at a better understanding of the initial stages of diamond nanostructure formation upon exposure of MWCNTs to a hydrogen plasma, which has been observed experimentally; [30][31] such interlayer bonds generate local nanodomains that resemble bulk diamond structures and can act as seeds for the nucleation of diamond nanocrystals embedded within the MWCNT matrix. 29 This mechanism also may be operative during the synthesis of "diamond nanotubes" (DNTs) by a process the first step of which is the formation of MWCNTs, followed by the appearance of diamond nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Opening and tuning of band gap by the formation of diamond superlattices in twisted bilayer graphene

Muniz

Maroudas

2012

Phys. Rev. B

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We report results of first-principles density functional theory calculations, which introduce a new class of carbon nanostructures formed due to creation of covalent interlayer C-C bonds in twisted bilayer graphene (TBG). This interlayer bonding becomes possible by hydrogenation of the graphene layers according to certain hydrogenation patterns. The resulting relaxed configurations consist of two-dimensional (2D) superlattices of diamond-like nanocrystals embedded within the graphene layers, with the same periodicity as that of the Moiré pattern corresponding to the rotational layer stacking in TBG. The 2D diamond nanodomains resemble the cubic or the hexagonal diamond phase. The detailed structure of these superlattice configurations is determined by parameters that include the twist angle, ranging from 0 to ~15 o , and the number of interlayer C-C bonds formed per unit cell of the superlattice. We demonstrate that formation of such interlayer-bonded finite domains causes the opening of a band gap in the electronic band structure of TBG, which depends on the density and spatial 2 distribution of interlayer C-C bonds. We have predicted band gaps as wide as 1.2 eV and found that the band gap increases monotonically with increasing size of the embedded diamond nanodomain in the unit cell of the superlattice. Such nanostructure formation constitutes a promising approach for opening a precisely tunable band gap in bilayer graphene.

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Section: Introductionmentioning

confidence: 99%

Opening and tuning of band gap by the formation of diamond superlattices in twisted bilayer graphene

Muniz

Maroudas

2012

Phys. Rev. B

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“…[267][268][269][270][271] The third route is coating a 1D materials with CNTs to form core/shell heterojunctions with CNT shells. [272][273][274][275] The fourth is directly growing though a single CVD process, and heterojunctions with CNT shells and with ZnS, [276] Mg 3 N 2 , [277] and Sn nanwire [278] cores were synthesized. The final route is based on a two-step CVD growth in an AAO template.…”

Section: Core/shell Heterojunctionsmentioning

confidence: 99%

The Intramolecular Junctions of Carbon Nanotubes

2008

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For the miniaturization of microelectronics, carbon nanotubes (CNTs) are regarded as ideal candidates for the next generation of nanoelectronics because of their excellent properties. To realize CNT‐based electronics, intramolecular junctions are required components, which can not only connect different CNTs for integration, but can also act as functional building blocks in the circuit, such as rectifiers, field‐effect transistors, switches, amplifiers, photoelectrical devices, etc. Therefore, intense attention has been focused on this topic and many advances have been achieved, especially in recent years. On the other hand, some challenges also exist. To provide researchers with a comprehensive overview of this field, this review discusses the synthesis, properties, and applications of intramolecular junctions of CNTs in detail. Among them, the applications of CNT integration are discussed specially. Furthermore, a brief summary and an outlook of future work are provided.

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“…3 A schematic figure showing a possible way to nanodiamond formation in the compressed interstellar cloud due to double supernova shock wave fronts following the Hansen model (Hansen et al 2007). Scale: a few hundred light years in diameter Alternatively, it is also important to note that the 2.6 nm average size of the meteoritic nanodiamonds may be related to the H-related self-terminating crystal growth process (Sun et al 2004) in the shock-wave front. On the other hand, the surface chemistry of the nanodiamonds shows a poor thermal stability between 850-1350 °C (Lu et al 2007), indicating the low-temperature crystallization process of the single diamond grains.…”

Section: (Nm)=rd (Nm/s)t (S)mentioning

confidence: 99%

Micro-Raman study of the Allende meteoritic nanodiamonds: Supernova-driven shock wave origin is revisited

Gucsik¹

2011

Central European Geology

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I have studied the Raman spectroscopic signatures of nanodiamonds from the Allende meteorite, in which some portions must be of presolar origin as indicated by the isotopic compositions of various trace elements. The spectra of the meteoritic nanodiamonds show a narrow peak at 1326 cm -1 and a broad band at 1590 cm -1 . Compared to the intensities of these peaks, the background fluorescence is relatively high. A significant frequency shift from 1332 to 1326 cm -1 , peak broadening, and appearance of a new peak at 1590 cm -1 might be due to shock effects during formation of the diamond grains. Such changes may have several origins: an increase in bond length, a change in the electron density function or charge transfer, or a combination of these factors. However, Raman spectroscopy alone does not allow distinguishing between a shock origin of the nanodiamonds and formation by a CVD process, as is favored by most workers.

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Diamond Nanorods from Carbon Nanotubes

Cited by 110 publications

References 34 publications

Opening and tuning of band gap by the formation of diamond superlattices in twisted bilayer graphene

Opening and tuning of band gap by the formation of diamond superlattices in twisted bilayer graphene

The Intramolecular Junctions of Carbon Nanotubes

Micro-Raman study of the Allende meteoritic nanodiamonds: Supernova-driven shock wave origin is revisited

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