Efficient Spectrofluorimetric Analysis of Single-Walled Carbon Nanotube Samples

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• 作者：John-David R. Rocha ; Sergei M. Bachilo ; Saunab Ghosh ; Sivaram Arepalli ; R. Bruce Weisman
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：October 1, 2011
• 年：2011
• 卷：83
• 期：19
• 页码：7431-7437
• 全文大小：968K
• 年卷期：v.83,no.19(October 1, 2011)
• ISSN：1520-6882

文摘

A new method and instrumentation are described for rapid compositional analysis of single-walled carbon nanotube (SWCNT) samples. The customized optical system uses multiple fixed-wavelength lasers to excite NIR fluorescence from SWCNTs individualized in aqueous suspensions. The emission spectra are efficiently captured by a NIR spectrometer with InGaAs multichannel detector and then analyzed by a computer program that consults a database of SWCNT spectral parameters. The identities and relative abundances of semiconducting SWCNTs species are quickly deduced and displayed in graphs and tables. Results are found to be consistent with those based on manual interpretation of full excitation鈥揺mission scans from a conventional spectrofluorometer. The new instrument also measures absorption spectra using a broadband lamp and multichannel spectrometers, allowing samples to be automatically characterized by their emission efficiencies. The system provides rapid data acquisition and is sensitive enough to detect the fluorescence of a few picograms of SWCNTs in 50 渭L sample volumes.