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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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp071410d
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.
|Subjects:||Material Science > Functional and hybrid materials|
Physical Science > Nano objects
|Deposited On:||20 Jan 2009 13:24|
|Last Modified:||26 Mar 2009 11:53|
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