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8308970 
Journal Article 
Functionalization of carbon nanohorns with azomethine ylides: towards solubility enhancement and electron-transfer processes 
Tagmatarchis, N; Maigné, A; Yudasaka, M; Iijima, S; , 
2006 
1 
Small
ISSN: 1613-6810
EISSN: 1613-6829 
2 
4 
490-494 
English 
17193072 
The covalent functionalization of carbon nanohorns (CNH) with 1,3-dipolar cycloaddition of azomethine ylides was investigated. It was found that the repetitive centrifugation-filtration-solubilization cyclic treatment on the 1,3-dipolar cycloaddition reaction of azo-methine ylides with CNH is crucial for obtaining functionalized nanohorns of the highest purity. It was observed that the UV/Vis-near-infrared (NIR) electronic absorption spectrum of functionalized nanohorns exhibits a broad band, which monotonically decreases as the NIR region is reached. However, characteristic transitions of pyrene-functionalized nanohorns were shown using the UV/Vis-NIR spectrum due to the presence of the chromophore in the region between 200-400 nm. 
Carbon; Nanostructures; Solubilization; Surface functionalization; TEM