Received: February 19, 2007

In Final Form: August 3, 2007

Abstract:

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 nanotubes. 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 -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.

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