Abstract
We attempt to control a chirality of a single-walled nanotube (SWNT) using free electron laser (FEL) irradiation during its growth. It is expected that the FEL irradiation with a wavelength corresponding to an optical absorption of SWNT with a specific chirality promotes the growth of the specific SWNT. The specific SWNT reveals an optical absorption corresponding to the each own chirality. CNTs were grown using alcohol catalytic chemical vapor deposition (ACCVD) method with ethanol. The FEL was in-situ irradiated during ACCVD. The FEL used in this work is featured by the variable wavelength and the very sharp pulse width approximately 500 ps. The FEL with the wavelength of 1300 ∼ 1450 nm was irradiated to grow semiconductive SWNTs with the diameter of ca. 1.1 nm. In the SWNTs grown without FEL irradiation and/or with 1350 nm FEL irradiation, radial breathing modes (RBM) peaks were observed. From the RBM peak value the diameter of the SWNTs was estimated ca. 1.1 nm. Also those SWNTs were thought to be metallic from Kataura plot and resonance Raman effects. On the other hand, it was confirmed that 1300, 1400 and 1450 nm FEL irradiations resulted in the change of SWNT chilality, where no RBM peak appeared.
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