Pressure-Induced Collapse in Double-Walled Carbon Nanotubes: Chemical and Mechanical Screening Effects
| Autor: | J. Mendes Filho, A. L. Aguiar, Rodrigo B. Capaz, Ch. Caillier, Yoong Ahm Kim, Alfonso San-Miguel, Eduardo B. Barros, A. G. Souza Filho, Morinobu Endo, Paulo Freire, Denis Machon, Hisakazu Muramatsu |
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| Rok vydání: | 2011 |
| Předmět: |
Double walled
Fullerene Average diameter Chemistry Nanotechnology Pressure stabilization Carbon nanotube Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention symbols.namesake General Energy law symbols Physical and Theoretical Chemistry Composite material Raman scattering |
| Zdroj: | The Journal of Physical Chemistry C. 115:5378-5384 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp110675e |
| Popis: | The vibrational properties of double-walled carbon nanotubes (DWNTs) is investigated by high-pressure resonance Raman scattering up to 30 GPa in two different pressure-transmitting media (PTM): paraffin oil and NaCl. The protection effect on the outer tube during compression is verified .The collapse of DWNTs is experimentally observed for the first time, showing to be two-step: the onset of the outer 1.56 nm diameter tube collapse at ∼21 GPa is followed by the collapse of the inner 0.86 nm diameter tube at a higher pressure of ∼25 GPa. This observation is supported by calculations. We show that filling a tube with another tube leads to a pressure stabilization against collapse, in strong opposition to what is observed when filling a tube with fullerenes or iodine. The collapse pressure in DWNTs appears to follow a 1/dtav3 law, where dtav is the average diameter from the inner and outer tubes, in agreement with predictions [Yang, X.;Appl. Phys. Lett. 2006, 89, 113101]. Contrary to SWNTs and peapods, for D... |
| Databáze: | OpenAIRE |
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