期刊
ACS NANO
卷 6, 期 8, 页码 6912-6921出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3018443
关键词
carbon nanotubes; nitrogen doping; chemical vapor deposition; gold nanoparticles
类别
资金
- NSF CAREER Award [0954345]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0954345] Funding Source: National Science Foundation
Nitrogen doping of carbon nanotubes during chemical vapor deposition synthesis can create unique stacked cup-shaped structures termed as nitrogen-doped carbon nanotube cups (NCNCs). These cups have semielliptical hollow cavities and elevated reactivity which could lead to various applications. In this work, by applying Intense ultrasonication to the as-synthesized NCNCs, we demonstrated an effective mechanical method to isolate the Individual cups with opened cavities from their stacks. The graphitic structures of the isolated cups and their inherent nitrogen functionalities were characterized by comprehensive microscopic and spectroscopic methods. In particular, we quantitatively determined the existence of amine functionalities on NCNCs and found that they were preferentially distributed at the open edges of the cups, providing localized reactive sites. Further, by thiolating the amine groups with 3-mercapto-propionic acid, we were able to effectively cork the isolated cups by gold nanoparticles with commensurate diameters. These cup-shaped carbon nanomaterials with controlled inner volumes and gold nanoparticle corks could find potential applications as nanoscale reaction containers or drug delivery vehicles.
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