Band gap fluorescence from individual single-walled carbon nanotubes
Band gap fluorescence from individual single-walled carbon nanotubes
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DOI：
10.1126/science.1072631
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发表时间：
2002-07-26
期刊：
影响因子：
56.9
通讯作者：
Smalley, RE
中科院分区：
文献类型：
--
作者：
O'Connell, MJ;Bachilo, SM;Smalley, RE
荧光已被观察到直接跨越半导体碳纳米管的带隙。我们获得了单独的纳米管，每个包裹在一个圆柱形胶束，通过超声搅拌的原料单壁碳纳米管在十二烷基硫酸钠的水分散体，然后除去管束，绳，和残留的催化剂。纳米管聚集成束，通过与金属管的相互作用淬灭荧光，并大大拓宽吸收光谱。在pH小于5时，单个纳米管的吸收和发射光谱显示出管的侧壁的带隙选择性质子化的证据。用碱或紫外光处理，这种质子化作用很容易逆转。
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.