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Kinetics of PL quenching during single-walled carbon nanotube rebundling and diameter-dependent surfactant interactions
被引:113
作者:
McDonald, Timothy J.
[1
]
Engtrakul, Chaiwat
Jones, Marcus
Rumbles, Garry
Heben, Michael J.
机构:
[1] Natl Renewable Energy Lab, Ctr Basic Sci, Golden, CO 80401 USA
[2] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA
关键词:
D O I:
10.1021/jp065281x
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The kinetics of single-walled carbon nanotube rebundling have been investigated by photoluminescence (PL) spectroscopy. The rate of loss of PL intensity was measured for 12 different nanotubes in three common aqueous surfactants (sodium dodecyl sulfate, SDS; sodium dodecylbenzene sulfonate, SDBS; and sodium cholate, SC) as the surfactant suspensions were diluted to promote nanotube rebundling, quenching of semiconductor nanotube PL, and precipitation. The rate of PL decay was first-order in the concentration of isolated nanotubes, as expected if surfactant desorption is rate-limiting in the rebundling process. Temperaturedependent measurements permitted an Arrhenius analysis from which diameter-dependent activation energies were determined. SDS was found to have very strong diameter dependence for activation energy, with stronger binding to smaller-diameter nanotubes, whereas SDBS displayed a weaker diameter dependence. SC was found to bind strongly to certain nanotubes and weakly to the (10,2) nanotube. The PL emission red shifted with time after dilution as surfactant desorption proceeded. This effect is attributed to an increase in the micropolarity at the nanotube surface.
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页码:25339 / 25346
页数:8
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