The kinetics of chirality assignment in catalytic single-walled carbon nanotube growth and the routes towards selective growth

Xu, Ziwei; Qiu, Lu; Ding, Feng

doi:10.1039/c7sc04714b

Cited by 43 publications

(65 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the 3D chiral morphology of inorganic crystals is not a unique attribute of chiral crystal structures, and it can also be achieved in achiral inorganic materials. [216][217][218][219][220][221][222][223][224][225] As discussed in Section 2, the native surface of the achiral inorganic surface can manifest chirality by mirror symmetry breaking on a crystal surface or interaction with organic molecules. The asymmetry of the surface atomic environment serves as a host for enantioselective interactions with organic molecules and biomolecules, or conversely, chiral molecules induce asymmetry of the surface atomic environment.…”

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

“…While surface-induced chirality is often observed in sub-5nm-sized nanocrystals, another interesting and atypical example is found on single-walled carbon nanotubes (SWCNTs). [219,223] The structure of an SWCNT can be understood as a roll-up of 2D carbon with a hexagonal lattice. The Bravais lattice vector, which roll-up occurs along, determines the surface structure of an SWCNT.…”

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

“…Recent approaches to chirality control of SWCNTs have focused on this fact and controlled the growth of edges. [219] Interestingly, it is possible to induce sequential growth of SWCNTs with different lattice vectors by in situ control of growth conditions, and distortion of the overall geometry occur at their boundary (Figure 6b). The geometry of SWCNTs has received less attention, but the potential formation of chiral geometry serves as an important example of connecting surface chirality and chiral geometry.…”

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

“…However, the 3D chiral morphology of inorganic crystals is not a unique attribute of chiral crystal structures, and it can also be achieved in achiral inorganic materials . As discussed in Section , the native surface of the achiral inorganic surface can manifest chirality by mirror symmetry breaking on a crystal surface or interaction with organic molecules.…”

Section: Chiral Geometry Of Inorganics and Metalsmentioning

confidence: 99%

See 3 more Smart Citations

Chiral Surface and Geometry of Metal Nanocrystals

et al. 2019

View full text Add to dashboard Cite

and their microscopic assembling and folding gradually give rise to chirality and left-right asymmetry from supramolecules to organelles, cells, and macroscopic organisms. Although the origin of homochirality is still unexplained and opens to arguments, investigating the chirality of matter and its origination is a central part of understanding asymmetric physical and chemical phenomena. The importance of chirality in chemistry lies in the asymmetric biochemical reactions with different physiological effect, which has paramount importance in biochemistry and pharmaceutical industry. [3,14,15] A mirror image of chiral objects can be determined into one of the left-handed or right-handed forms of geometry, called enantiomer or enantiomorph. Both enantiomers of a chiral object consist of identical chemical compositions but indeed are significantly different in their light-matter interaction, catalysis, and biological functions. The enantioselective signaling and enzymatic reaction are attributed to the homochirality of the living organism and its biological receptors, which are only composed of l-form amino acids and d-form sugars in nature. [7,14,15] Thalidomide is often referred to as a representative but also the most tragic example. The R-form of this drug is harmless to the body and was released as a painkiller for pregnant women, but its enantiomer causes severe malformation in the limbs of infants. [15,16] Since then, it has been a requirement for drugs to be characterized as a single enantiomer to be approved. 3D chirality is a unique characteristic of life, and the stereochemical aspect of molecular materials has come to fore of modern chemistry and biology. The optical property of chiral compounds, the so-called chiroptical effect, is highly effective for observing chirality in a nondestructive manner. [17] Chiroptical effects can be used for determination of the absolute configuration and enantiomeric excess of chiral molecules and as an optical probe for estimating the 3D structure of biomacromolecules such as proteins and DNA. [18] However, in most chiral organic molecules and biomolecules, chiroptical effects are typically very weak due to the much smaller size of molecules than the wavelength of exciting light. Integration of inorganic nanomaterials is one promising method for increasing the chiroptical signal of molecules; it focuses the light into nanoscale area to maximize the lightmatter interaction. [19-22] For example, a complex spatial profile Chirality is a basic property of nature and has great importance in photonics, biochemistry, medicine, and catalysis. This importance has led to the emergence of the chiral inorganic nanostructure field in the last two decades, providing opportunities to control the chirality of light and biochemical reactions. While the facile production of 3D nanostructures has remained a major challenge, recent advances in nanocrystal synthesis have provided a new pathway for efficient control of chirality at the nanoscale by transferring molecular chirality to the geo...

show abstract

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

Section: Chiral Geometry Of Inorganic Crystalsmentioning

confidence: 99%

Section: Chiral Geometry Of Inorganics and Metalsmentioning

confidence: 99%

See 2 more Smart Citations

Chiral Surface and Geometry of Metal Nanocrystals

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In the meantime, theoreticians have established a better understanding of the SWCNT nucleation and growth mechanisms at the atomic scale that have established guidelines for achieving chirality control on the basis of both thermodynamics and kinetics . However, recent studies suggest that early stages of SWCNT nucleation and growth on metal clusters is crucial to determine the chirality of products and that the growth rate increases proportionally to the chiral angle from 0° < θ < 30° . However, the roles of additive species which are thought to activate the metal catalysts are not clear for chiral‐selective growth, although such influence has been observed in experiments .…”

Section: Introductionmentioning

confidence: 99%

Chiral‐selective etching effects on carbon nanotube growth at edge carbon atoms

et al. 2018

View full text Add to dashboard Cite

Chemical vapor deposition (CVD) utilizing metal cluster nanoparticle catalysts is commonly used to synthesize carbon nanotubes (CNT), with oxygen-containing species such as water or alcohol included in the feedstock for enhanced yield. However, the etching effect of these additives on the growth mechanism has rarely been investigated, despite evidence suggesting that etching potentially affects the chirality distribution of product CNTs. We used quantum chemical methods to study how water-based etchant radicals (OH and H) may enhance the chiral selectivity during CVD growth using CNT cap models. Chemical reactivities of the caps with the etchant radicals were evaluated using density functional theory (DFT). It was found that the reactivities on the cap edges correlate with the chirality of the caps. These results suggest that proper selection of etchant species can provide opportunities for selective chirality control of the product CNTs.

show abstract

Advances in Precise Structure Control and Assembly toward the Carbon Nanotube Industry

Zhu

Cui

Bai

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) possess a unique tubular structure composed of highly graphitized atoms. Since their sp2 hybridized skeleton is discovered under the microscope, extensive attention is paid to their peculiar physics and extraordinary performances in mechanics, optics, and electricity. However, due to the challenges in controlled synthesis and mass production, there is a long bottleneck period in both the science and engineering of CNTs. In the recent decade, significant advances have emerged in ton‐scale production, 3D microprocessors, ultrastrong fibers, etc., which have pushed the renaissance of CNTs toward a new peak. This important progress benefits from the critical but commonly ignored breakthroughs in the precise structure control and assembly of CNTs. Herein, the morphological manipulation and technical routes toward the CNT industry will be focused on. First, the growth mechanism of defect‐free aligned CNTs will be discussed. Subsequently, nondestructive flow‐guided fabrication methods and their application paradigms are summarized. Then, attention will be turned to assembly‐based industrial production and applications of CNTs. Some research prospects toward the precise synthesis and CNT industry are proposed at last, in the hope of building a comprehensive understanding on the catalytic assembly toward defect‐free nanostructures and their high‐end applications.

show abstract

The kinetics of chirality assignment in catalytic single-walled carbon nanotube growth and the routes towards selective growth

Abstract: The routes towards carbon nanotube's chirality control during growth was revealed by kinetic modelling.

Cited by 43 publications

References 55 publications

Chiral Surface and Geometry of Metal Nanocrystals

Chiral Surface and Geometry of Metal Nanocrystals

Chiral‐selective etching effects on carbon nanotube growth at edge carbon atoms

Advances in Precise Structure Control and Assembly toward the Carbon Nanotube Industry

Contact Info

Product

Resources

About