Nano Archive

Chiral-selective protection of single-walled carbon nanotube photoluminescence by surfactant selection

McDonald, Timothy J. and Blackburn, Jeffrey L. and Metzger, Wyatt K. and Rumbles, Garry and Heben, Michael J. (2007) Chiral-selective protection of single-walled carbon nanotube photoluminescence by surfactant selection. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (48). pp. 17894-17900.

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We study the effects of adding H2O2 to acid-purified and unpurified single-walled carbon nanotubes (SWNTs) in aqueous suspensions using photoluminescence (PL) and optical absorption spectroscopies. The addition of H2O2 to suspensions of unpurified SWNTs results in a rapid (1-2 h) quenching of the photoluminescence from all tubes, whereas H2O2 addition to acid-purified SWNTs causes the nanotube PL to grow in intensity over a period of several days before decaying in a tube-specific manner that depends on the binding strength of the surfactant sheath. With the appropriate choice of surfactants, the PL for specific acid-purified SWNTs can be protected such that novel mid-gap and phonon-assisted absorption and emission transitions can be observed without the obscuring effects associated with emission from other nanombes. The H2O2 treatment also results in a reduction of the high-energy absorption background that has been associated with either carbonaceous impurities or the SWNT pi-plasmon oscillation. An understanding of the related mechanisms leads to a new method for separating nanotubes by type based on selective oxidation followed by selective precipitation. These findings offer the possibility of efficiently separating large quantities of nanotubes by chirality.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nano objects
ID Code:539
Deposited By:IoN
Deposited On:20 Jan 2009 13:24
Last Modified:26 Mar 2009 11:53

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