{'fraction_non_alphanumeric': 0.02353896103896104, 'fraction_numerical': 0.012987012987012988, 'mean_word_length': 5.258883248730965, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Catalytic CVD Generation of High-Purity SWNTs with a Narrow Diameter Distribution

Photoluminescence [1] and Raman scatterings of single-walled carbon nanotubes (SWNTs) synthesized from isotopically-modified ethanol were studied. Using Alcohol catalytic CVD (ACCVD) technique optimized for the efficient production of SWNTs from very small amount of ethanol, SWNTs consisting of carbon-13 isotope (SWCNTs) were synthesized in addition to normal SWNTs consisting of mainly C. The vibrational features of SWCNTs were compared with those of normal SWNTs through NIR-luminescence mapping and Raman spectroscopy. Fig. 1 compares Raman scattering spectra for SWCNTs and normal SWNTs excited with 488 nm laser. Small D-band signal at 1350 cm suggests that high quality SWNTs were synthesized from tiny amount of ethanol. There was almost no change in Raman spectra shape for SWCNTs but the Raman shift frequency was 13 / 12 times smaller because of the heavier carbon atoms. In addition to Raman spectroscopy, we have mapped the NIR-luminescence of D2O-surfactant dispersions of both SWCNTs and normal SWNTs. By comparing the two maps, luminescence peaks corresponding to electronic transitions with vibrational excitation were identified.