Boron Nitride Nanotubes

Chopra, Nasreen G.; Luyken, R.J.; Cherrey, K.; Crespi, Vincent H.; Cohen, Marvin L.; Louie, Steven G.; Zettl, Alex

doi:10.1126/science.269.5226.966

Cited by 3,016 publications

(1,734 citation statements)

References 15 publications

Supporting

Mentioning

1,659

Contrasting

Unclassified

Order By: Relevance

“…Chemical doping of heteroatoms to the lattice of the carbon frameworks is an effective strategy to modulate their intrinsic physical and chemical properties 4,5 . In particular, among the potential dopants, nitrogen is considered to be one of the more fascinating elements for chemical doping.…”

mentioning

confidence: 99%

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

et al. 2012

View full text Add to dashboard Cite

Bowl-shaped aromatic compounds, namely buckybowls constitute a family of curved polycyclic aromatic carbons along with fullerenes and carbon nanotubes. Doping of heteroatoms to the carbon frameworks of such aromatic compounds drastically modulates their physical and chemical properties. In contrast to nitrogen-doped azafullerenes or carbon nanotubes, synthesis of azabuckybowls, nitrogen-doped buckybowls, remains an unsolved challenging task. Here we report the first enantioselective synthesis of a chiral azabuckybowl, triazasumanene. X-ray crystallographic analysis confirmed that the doping of nitrogen induces a more curved and deeper bowl structure than in all-carbon buckybowls. As a result of the deeper bowl structure, the activation energy for the bowl inversion (thermal flipping of the bowl structure) reaches an extraordinarily high value (42.2 kcal per mol). As the bowl inversion corresponds to the racemization process for chiral buckybowls, this high bowl inversion energy leads to very stable chirality of triazasumanene.

show abstract

mentioning

confidence: 99%

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

et al. 2012

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] They have excellent mechanical properties, high thermal conductivity, and high resistance to oxidation. [10][11][12][13][14][15] These properties make them very promising in a variety of potential applications such as optoelectronic nanodevices, spintronics, light emission, photocatalysts, thermal rectifiers, functional composites, etc. [16][17][18][19][20][21] One potential application is for CO 2 capture and storage.…”

Section: Introductionmentioning

confidence: 99%

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

et al. 2013

View full text Add to dashboard Cite

Increasing concerns about the atmospheric CO2 concentration and its impact on the environment are motivating researchers to discover new materials and technologies for efficient CO2 capture and conversion. Here, we report a study of the adsorption of CO2, CH4, and H2 on boron nitride (BN) nanosheets and nanotubes (NTs) with different charge states. The results show that the process of CO2 capture/release can be simply controlled by switching on/off the charges carried by BN nanomaterials. CO2 molecules form weak interactions with uncharged BN nanomaterials and are weakly adsorbed. When extra electrons are introduced to these nanomaterials (i.e., when they are negatively charged), CO2 molecules become tightly bound and strongly adsorbed. Once the electrons are removed, CO2 molecules spontaneously desorb from BN absorbents. In addition, these negatively charged BN nanosorbents show high selectivity for separating CO2 from its mixtures with CH4 and/or H2. Our study demonstrates that BN nanomaterials are excellent absorbents for controllable, highly selective, and reversible capture and release of CO2. In addition, the charge density applied in this study is of the order of 1013 cm-2 of BN nanomaterials and can be easily realized experimentally. 2013 American Chemical Society. ABSTRACT:Increasing concerns about the atmospheric CO 2 concentration and its impact on the environment are motivating researchers to discover new materials and technologies for efficient CO 2 capture and conversion. Here, we report a study of the adsorption of CO 2 , CH 4 and H 2 on boron nitride (BN) nanosheets and nanotubes (NTs) with different charge states. The results show that the process of CO 2 capture/release can be simply controlled by switching on/off the charges carried by BN nanomaterials. CO 2 molecules form weak interactions with uncharged BN nanomaterials and are weakly adsorbed. When extra electrons are introduced to these nanomaterials (i.e. when they are negatively charged), CO 2 molecules become tightly bound and strongly adsorbed. Once the electrons are removed, CO 2 molecules spontaneously desorb from BN absorbents. In addition, these negatively charged BN nano-sorbents show high selectivity for separating CO 2 from its mixtures with CH 4 and/or H 2 . Our study demonstrates that BN nanomaterials are excellent absorbents for controllable, highly selective, and reversible capture and release of CO 2. In addition, the charge density applied in this study is of the order of 10 13 cm -2 of BN nanomaterials, and can be easily realized experimentally.

show abstract

“…In complete analogy to carbon nanotubes, boron nitride (BN) nanotubes [1,2] can be thought of as cylinders that are obtained when a single sheet of hexagonal BN (hBN) is rolled onto itself. Since hexagonal BN is a large band-gap insulator [3], the band gap of BN tubes is similarly large, independent of their radius and chirality.…”

mentioning

confidence: 99%

Excitons in Boron Nitride Nanotubes: Dimensionality Effects

2006

View full text Add to dashboard Cite

We show that the optical absorption spectra of boron nitride (BN) nanotubes are dominated by strongly bound excitons. Our first-principles calculations indicate that the binding energy for the first and dominant excitonic peak depends sensitively on the dimensionality of the system, varying from 0.7 eV in bulk hexagonal BN via 2.1 eV in the single sheet of BN to more than 3 eV in the hypothetical 2; 2 tube. The strongly localized nature of this exciton dictates the fast convergence of its binding energy with increasing tube diameter towards the sheet value. The absolute position of the first excitonic peak is almost independent of the tube radius and system dimensionality. This provides an explanation for the observed ''optical gap'' constancy for different tubes and bulk hexagonal BN.

show abstract

Boron Nitride Nanotubes

Cited by 3,016 publications

References 15 publications

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials

Excitons in Boron Nitride Nanotubes: Dimensionality Effects

Contact Info

Product

Resources

About

Boron Nitride Nanotubes

Cited by 3,016 publications

References 15 publications

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Charge-Controlled Switchable CO2 Capture on Boron Nitride Nanomaterials

Excitons in Boron Nitride Nanotubes: Dimensionality Effects

Contact Info

Product

Resources

About

Charge-Controlled Switchable CO₂ Capture on Boron Nitride Nanomaterials