| 1. |
|
|
| 2. |
- Concina, B., et al.
(författare)
-
Delayed ionisation of C-76
- 2006
-
Ingår i: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY. - : Elsevier BV. - 1387-3806. ; 252:2, s. 96-99
-
Tidskriftsartikel (refereegranskat)
|
|
| 3. |
- Dittmer, Staffan, 1970, et al.
(författare)
-
In situ Raman studies of single-walled carbon nanotubes grown by local
- 2008
-
Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614 .- 1873-4448. ; 457
-
Tidskriftsartikel (refereegranskat)abstract
- Using in situ Raman spectroscopy we investigate single wall carbon nanotube growth on Mo electrodes, using a highly localized resistive heating technique. Small diameter semiconducting single wall nanotubes grow very rapidly when the catalyst support is heated to a temperature of 800 C. The G/D ratio shows an interesting time-dependent behaviour. It first decreases, indicating the presence of amorphous carbon and then significantly increases again after ca. 5 min growth while retaining the position and shape expected for predominantly semiconducting carbon nanotubes.
|
|
| 4. |
- Gromov, Andrei, 1959, et al.
(författare)
-
Covalent Amino functionalisation of single walled carbon nanotubes
- 2005
-
Ingår i: J. Materials Chem. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 15, s. 3334-3339
-
Tidskriftsartikel (refereegranskat)abstract
- Chemical transformation of single-wall carbon nanotubes (SWNT), edge-terminated with carboxylic groups, to SWNT species with amino groups directly attached to the tube open ends has been performed. Different synthetic approaches have been investigated. The reaction products were characterised by FTIR, Raman spectroscopy, XPS and SEM.
|
|
| 5. |
- Hedén, Martin, 1976, et al.
(författare)
-
Thermal radiation from CN+ and La@CN
- 2005
-
Ingår i: J. Chem. Phys.. - : AIP Publishing. - 0021-9606. ; 123
-
Tidskriftsartikel (refereegranskat)abstract
- The radiative cooling of positively charged fullerene and endohedral fullerene fragments of C60, C70, C84, and La@C82 has been measured in a time-of-flight mass spectrometer. The radiative cooling is measured via its influence on the metastable decay. The emissivity extracted from the data is between 4×10–4 and 13×10–4. These values agree fairly well with the emissivity calculated from considering the low-energy tail of the surface plasmon. No major difference is found in the emission behavior of empty and endohedral fullerenes.
|
|
| 6. |
- Lassesson, Andreas, 1976, et al.
(författare)
-
A femtosecond laser study of the endoral fullerenes Li@C60 and La@C82
- 2005
-
Ingår i: Eur. Phys. J. D. - : Springer Science and Business Media LLC. - 1434-6060. ; 34, s. 205-209
-
Tidskriftsartikel (refereegranskat)abstract
- The endohedral fullerenes La@C82 and Li@C60 have been studied in the gas phase with femtosecond laser excitation. The two molecules show qualitatively the same behaviour with respect to ion yield vs. pulse energy, but markedly different fragmentation patterns, with La@C82 fragmenting via the shrink-wrap mechanism and Li@C60 predominantly losing the metal atom in the first fragmentation step. The ion yields and electron energy distributions of La@C82 agree well with a recently developed model for fs laser ionisation of C60.
|
|
| 7. |
- Lassesson, Andreas, 1976, et al.
(författare)
-
Formation of small lanthanum-carbide ions from laser induced fragmentation of La@C-82
- 2003
-
Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 119:11, s. 5591-5600
-
Tidskriftsartikel (refereegranskat)abstract
- The fragmentation behavior of the endohedral metallofullerene La@C-82 was studied using gas phase time-of-flight mass spectrometry. The results were compared with the fragmentation of C-60. When the metallofullerene was excited by a 337 nm ns laser, small lanthanum-carbide fragments LaCn+, n=0-6, were detected. A simple statistical maximum entropy model was used to simulate the excitation energy dependence of the loss of the LaCn+ molecules as well as C-2 evaporation to form smaller metallofullerenes. By comparing experimental ion intensities with the model, the appearance energies of LaCn+, n=0-6, were found to lie above 65 eV. The lanthanum-carbide fragments ejected from La@C-82 decrease in size with increasing internal energy. The ejection of La+ and LaC2+ is preferred at the expense of larger fragments such as LaC4+ and metallofullerenes at the higher excitation. (C) 2003 American Institute of Physics.
|
|
| 8. |
- Lassesson, Andreas, 1976, et al.
(författare)
-
Investigations into the fragmentation and ionization of highly excited La@C-82
- 2002
-
Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 117:21, s. 9811-9817
-
Tidskriftsartikel (refereegranskat)abstract
- We report the first measurements of delayed ionization of the metallofullerene La@C-82. When highly excited in laser desorption, La@C-82 was found to ionize over several microseconds. The rate of delayed ionization of La@C-82 was compared to C-60 under the same extraction conditions, and found to be significantly different. A theoretical model was used for the fitting of the ion signal of the two fullerenes. The metallofullerene results can be fitted well over a time window
|
|
| 9. |
- Mattsson, M, et al.
(författare)
-
Dielectrophoresis-induced separation of metallic and semiconducting SWNT in a continuous flow microfluidic system
- 2007
-
Ingår i: Journal of Nanotechnology and Nanoscience. - : American Scientific Publishers. - 1533-4880. ; 7, s. 3431-3435
-
Tidskriftsartikel (refereegranskat)abstract
- The AC dielectrophoresis-induced separation of metallic and semiconducting single-wall carbon nanotubes has been carried out in a continuous flow microfluidic system with isolated electrodes. The separation has been studied for single-wall carbon nanotube aqueous suspensions with ionic (sodium dodecylsulphate) and non-ionic (TritonX-100) surfactants. The efficiency of separation has been determined with the help of resonant Raman spectroscopy using various excitation energies. The prototype microfluidic cell presently shows somewhat inferior separation efficiency with respect to static dielectrophoretic filtering on arrays of microelectrodes but has potential for improvements. Factors influencing the separation efficiency and scaling up of the process are discussed.
|
|
| 10. |
- Popok, Vladimir, 1966, et al.
(författare)
-
Conductance and EPR study of the endohedral fullerene Li@C60
- 2005
-
Ingår i: Solid State Communications. ; 133:8, s. 499-503
-
Tidskriftsartikel (refereegranskat)abstract
- Thin films and bulk samples of endohedral fullerenes Li@C60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOhmcm for thin Li@C60 films deposited in vacuum, four orders of magnitude lower than C60 samples. A drastic effect on the conductance, lowering it to the values typical for C60, is observed when the Li@C60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C60 compared to C60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes 4 orders of magnitude longer compared to the spin-spin relaxation time.
|
|
| 11. |
- Popok, Vladimir, 1966, et al.
(författare)
-
Electronic Properties of thin films sublimed from La@C82 and Li@C60
- 2008
-
Ingår i: Nano. ; 3:3, s. 155-160
-
Tidskriftsartikel (refereegranskat)abstract
- La@C82 and Li@C60 thin films obtained by sublimation in vacuum are studied using four-probe current-voltage measurements and atomic force microscopy. In situ electrical measurements show semiconducting behavior of both films with room-temperature resistivity of 21+-8 and 1230+-50 Ohm.cm for the La@C82 and Li@C60, respectively. A variable range hopping mechanism of conductance is suggested from the temperature dependences of resistance. The activation energies for electron transport are calculated for both metallofullerenes. Irreversible changes to the Li@C60 film structure increasing the film resistivity to values typical for C60 are found at elevated temperatures. The effect of exposure to ambient atmosphere on the conductance of the films is discussed.
|
|
| 12. |
|
|
| 13. |
- Rychwalski, Rodney, 1945, et al.
(författare)
-
CF, CB and SWNT Polymer Composites
- 2003
-
Ingår i: The National Conferences on Polymer Characterization, X Seminar TWORZYWA SZTUCZNE W BUDOWIE MASZYN (Plastics in Machine Design), Cracow University of Technology, Cracow (Poland), September 29-October 1, 2003. ; , s. 347-357
-
Konferensbidrag (refereegranskat)
|
|
