FTIR-luminescence mapping of dispersed single-walled carbon nanotubes
FTIR-luminescence mapping of dispersed single-walled carbon nanotubes
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分散单壁碳纳米管的 FTIR 发光图
DOI：
10.1088/1367-2630/5/1/140
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发表时间：
2003
影响因子：
3.3
通讯作者：
M. Kappes
中科院分区：
文献类型：
--
作者：
S. Lebedkin;K. Arnold;F. Hennrich;R. Krupke;B. Renker;M. Kappes
我们已经应用了FTIR-发光/FT-拉曼技术映射的近红外光致发光（PL）的水表面活性剂分散的单壁碳纳米管（SWNTs）在宽激发（250-1500 nm）和发射（800-1700 nm）范围内。用标准氙灯和卤钨灯的单色光扫描激发波长。用脉冲激光蒸发法制备了平均直径约为1.3 nm的单壁碳纳米管，并给出了其PL谱图。当分散由强大的超声搅拌和ultracentragation分离，这些纳米管显示结构化的吸收带和PL量子产率高达~10-3。这表明分散体中有大部分的单个纳米管。从PL数据导出的纳米管的电子带间跃迁能合理地对应于在丁等人的修正紧束缚模型中计算的能量。
We have applied the FTIR-luminescence/FT-Raman technique to map the near-infrared photoluminescence (PL) of water–surfactant dispersions of single-walled carbon nanotubes (SWNTs) in broad excitation (250–1500 nm) and emission (800–1700 nm) ranges. The excitation wavelength was scanned by using the monochromatized light of standard xenon and tungsten halogen lamps. The PL maps are presented for SWNTs with a mean diameter of ~1.3 nm prepared by the pulsed laser vaporization method. When dispersed by powerful ultrasonic agitation and separated by ultracentrifugation, these nanotubes show structured absorption bands and a PL quantum yield as high as ~10-3. This indicates a large fraction of individual nanotubes in the dispersion. Electronic interband transition energies of nanotubes derived from the PL data correspond reasonably to the energies calculated in the modified tight-binding model of Ding et al.