Abstract
A method is presented for the production of carbon nanomaterials from carbon dioxide in a low temperature process. In this method, carbon dioxide is irradiated with an ultraviolet laser at the conditions of critical opalescence where light is scattered and absorbed. Spherical carbon nanoparticles are obtained under these conditions on metal substrates without any additional catalyst near room temperature. The particles are of approximately uniform shape and size of around 100 nm. Some of the particles form clusters. The method is reproducible on different substrates. Quantum chemical calculations have been employed in order to elucidate the role of critical opalescence and of the substrate. The calculations show that the presence of molecular clusters at the critical point is essential in decreasing the excitation energy. The dissociation reaction most likely occurs on the surface of the substrate, where the excitation energy is decreased even further.
| Original language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Journal of Supercritical Fluids |
| Volume | 72 |
| DOIs | |
| Publication status | Published - Dec 2012 |
| Externally published | Yes |
Fingerprint
Keywords
- Carbon dioxide conversion
- Carbon nanomaterials
- Critical opalescence
- Photolysis
- Supercritical carbon dioxide
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Condensed Matter Physics
Cite this
Creation of 3-dimensional carbon nanostructures from UV irradiation of carbon dioxide at room temperature. / Aschenbrenner, Ortrud; Fukuda, Takahiro; Hasumura, Takashi; Maekawa, Toru; Gun'Ko, Vladimir M.; Mikhalovsky, Sergey V.; Cundy, Andrew B.; Whitby, Raymond L D.
In: Journal of Supercritical Fluids, Vol. 72, 12.2012, p. 1-6.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Creation of 3-dimensional carbon nanostructures from UV irradiation of carbon dioxide at room temperature
AU - Aschenbrenner, Ortrud
AU - Fukuda, Takahiro
AU - Hasumura, Takashi
AU - Maekawa, Toru
AU - Gun'Ko, Vladimir M.
AU - Mikhalovsky, Sergey V.
AU - Cundy, Andrew B.
AU - Whitby, Raymond L D
PY - 2012/12
Y1 - 2012/12
N2 - A method is presented for the production of carbon nanomaterials from carbon dioxide in a low temperature process. In this method, carbon dioxide is irradiated with an ultraviolet laser at the conditions of critical opalescence where light is scattered and absorbed. Spherical carbon nanoparticles are obtained under these conditions on metal substrates without any additional catalyst near room temperature. The particles are of approximately uniform shape and size of around 100 nm. Some of the particles form clusters. The method is reproducible on different substrates. Quantum chemical calculations have been employed in order to elucidate the role of critical opalescence and of the substrate. The calculations show that the presence of molecular clusters at the critical point is essential in decreasing the excitation energy. The dissociation reaction most likely occurs on the surface of the substrate, where the excitation energy is decreased even further.
AB - A method is presented for the production of carbon nanomaterials from carbon dioxide in a low temperature process. In this method, carbon dioxide is irradiated with an ultraviolet laser at the conditions of critical opalescence where light is scattered and absorbed. Spherical carbon nanoparticles are obtained under these conditions on metal substrates without any additional catalyst near room temperature. The particles are of approximately uniform shape and size of around 100 nm. Some of the particles form clusters. The method is reproducible on different substrates. Quantum chemical calculations have been employed in order to elucidate the role of critical opalescence and of the substrate. The calculations show that the presence of molecular clusters at the critical point is essential in decreasing the excitation energy. The dissociation reaction most likely occurs on the surface of the substrate, where the excitation energy is decreased even further.
KW - Carbon dioxide conversion
KW - Carbon nanomaterials
KW - Critical opalescence
KW - Photolysis
KW - Supercritical carbon dioxide
UR - http://www.scopus.com/inward/record.url?scp=84865825893&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865825893&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2012.07.017
DO - 10.1016/j.supflu.2012.07.017
M3 - Article
VL - 72
SP - 1
EP - 6
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
ER -