Band Gap Fluorescence from Individual Single-Walled Carbon Nanotubes

Abstract

Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles otherwise quenches the fluorescence through interactions with metallic tubes and substantially broadens the absorption spectra. At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap–selective protonation of the side walls of the tube. This protonation is readily reversed by treatment with base or ultraviolet light.

Keywords

Carbon nanotubeFluorescenceProtonationSodium dodecyl sulfateMaterials scienceAbsorption (acoustics)Aqueous solutionBand gapOptical properties of carbon nanotubesPhotochemistryDispersion (optics)UltravioletChemical engineeringAbsorption spectroscopyNanotechnologyAnalytical Chemistry (journal)ChemistryNanotubeComposite materialOpticsOrganic chemistryOptoelectronics

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Publication Info

Year: 2002
Type: article
Volume: 297
Issue: 5581
Pages: 593-596
Citations: 3818
Access: Closed

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APA Style

                            
                                
                                    Michael O’Connell, 
                                
                                    Sergei M. Bachilo, 
                                
                                    Chad Huffman
                                
                                et al.
                            
                            (2002). 
                            Band Gap Fluorescence from Individual Single-Walled Carbon Nanotubes. 
                            Science
                            , 297
                            (5581)
                            , 593-596.
                            https://doi.org/10.1126/science.1072631
                        

Identifiers

DOI: 10.1126/science.1072631