Electronic structure control of single-waited carbon nanotube functionalization

Science

Volumn 301, Issue 5639, 2003, Pages 1519-1522

  Strano, Michael S ^a   Dyke, Christopher A ^b   Usrey, Monica L ^a   Barone, Paul W ^a   Allen, Mathew J ^b   Shan, Hongwei ^b   Kittrell, Carter ^b   Hauge, Robert H ^b   Tour, James M ^b   Smalley, Richard E ^b  

^a UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

^b RICE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CHARGE TRANSFER; ELECTRONIC STRUCTURE; FERMI LEVEL; SOLUTIONS;

METALLIC SPECIES;

CARBON NANOTUBES;

CARBON;

CARBON; NANOTECHNOLOGY;

AQUEOUS SOLUTION; ARTICLE; CHEMICAL BOND; CHEMICAL STRUCTURE; CONDUCTANCE; ELECTRON; ELECTRONICS; ION TRANSPORT; NANOTECHNOLOGY; PRIORITY JOURNAL; REACTION ANALYSIS; SEMICONDUCTOR;

EID: 0141483758     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1087691     Document Type: Article

References (23)

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18. A recirculating flow reactor was used to transfer sodium dodecyl sulfate-suspended carbon nanotubes at pH = 10 at a flow rate of 150 ml/min through a cuvette with inlet and outlet ports. Continuous UV-vis-nIr spectra were generated after the addition of a metered amount of diazonium aryl chloride tetrafluoroborate. Addtions were made in 0.05 mM increments after the system had reached steady state.
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21. Increasing the ionic strength of the surfactant-suspended nanotubes screens the charged repulsion of the sulfate head groups and causes the adsorbed layer to adopt a configuration that allows greater access of water to the surface. This causes a characteristic red shift of the absorption transitions that is most prominent for the v1→c1 transitions of the semiconductors. Because of the convolution of the transitions in the spectrum, this shifting is seen as a change in intensity of one region in particular. The results can be qualitatively duplicated by the addition of 100 mM NaCl to the solution.
22. Thermogravimetric analysis, as well as absorption and Raman spectra of the reacted and thermally restored material, are available as supporting material on Science Online.
23. We thank J. White for assistance with Raman spectroscopy M.S.S. acknowledges the financial support of the University of Illinois, School of Chemical Sciences. Support at Rice University was provided by the NSF Focused Research Group on Fullerene Nanotube Chemistry (DMR-0073046), the NSF Center for Biological and Environmental Nanotechnology (EEC-0118007), NASA URETI NCC-01-0203, Air Force Office of Scientific Research (F49620-01-1-0364), and the Office of Naval Research Polymer Division. Support from NASA (NCC9-77) for development of the HiPco method is also gratefully acknowledged.