Optical absorption and transient photobleaching in solutions of surfactant encapsulated and DNA wrapped single-walled carbon nanotubes

被引：3

作者：

Arnold, MS ^{[1
]}

Lan, S ^{[1
]}

Cruz, SC ^{[1
]}

Sharping, JE ^{[1
]}

Stupp, SI ^{[1
]}

Kumar, P ^{[1
]}

Hersam, MC ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

QUANTUM SENSING AND NANOPHOTONIC DEVICES | 2004年 / 5359卷

关键词：

carbon nanotube; buckytube; SWNT; isolated; optical; absorption; photobleaching; surfactant; sodium dodecyl sulfate; SDS; deoxyribose nucleic acid; DNA;

D O I：

10.1117/12.521192

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Optical absorption and transient photobleaching in solutions of surfactant encapsulated and DNA wrapped single-walled carbon nanotubes (SWNTs) are studied. Optical transitions between van Hove singularities are red shifted in solutions of DNA wrapped SWNTs compared with transitions in solutions of sodium dodecyl sulfate (SDS) encapsulated SWNTs. This red shift may be due to changes in the local surrounding dielectric constant and corresponding changes in charge screening. Transient photobleaching at the Ell transition of semiconducting SWNTs is observed in both solutions of SDS encapsulated SWNTs and DNA wrapped SWNTs in response to optical excitation at corresponding E-22 transitions, and the saturation of photobleaching at high excitation intensities greater than 500 W cm(-2) is studied. It is found that the photobleaching intensity does not saturate as significantly in solutions of DNA wrapped SWNTs as in solutions of SDS isolated SWNTs. Lastly, using degenerate, delayed pump-probe characterization, the temporal relaxation of excited charge carriers is investigated. Measured decays are characterized by both fast and slow processes. The slow decay time constant across the band gap of semiconducting SWNTs is fit to 120 ps for SDS encapsulated SWNTs and 73 ps for DNA wrapped SWNTs.

引用

页码：376 / 386

页数：11

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