Wang, Jun and Blau, Werner J. (2008) Solvent effect on optical limiting properties of single-walled carbon nanotube dispersions. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (7). pp. 2298-2303.
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Single-walled carbon nanotubes (SWNTs) were dispersed in N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), and NN-dimethylacetamide (DMA), respectively. The nonlinear optical properties of SWNT dispersions were studied using the open aperture Z-scan technique at 532 nm. The nonlinear extinction coefficients strongly increase with increasing SWNT concentration. In the three dispersions, the DMF dispersions show the strongest nonlinear extinction effect. In conjunction with this, the optical limiting performance is also superior for the DMF dispersions. Compared with DMF and DMA, NMP has a much better debundling effect for SWNTs; however, the optical limiting properties of the NMP dispersions is inferior. The SWNT dispersions seem to attenuate the intense light more effectively, as is shown by the stronger optical limiting response compared to the zinc plithalocyanine solution, at the same concentration. The static light scattering experiment revealed that the DMF dispersions have the largest average bundle size. The main origin of the optical limiting effect of the SWNT dispersions is due to the solvent and/or carbon vapor bubble-induced nonlinear scattering. Our results show that the average bundle size of SWNTs in combination with the physical properties of the solvent dominate the nonlinear extinction and optical limiting properties of SWNT dispersions.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Photonics
|Deposited By:||Lesley Tobin|
|Deposited On:||25 Nov 2008 15:11|
|Last Modified:||05 Feb 2009 12:35|
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